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Bhosale SB, Kumbhar SS, Patil SS, Ransing A, Parale VG, Lokhande CD, Gunjakar JL, Park HH, Patil UM. Harnessing morphological alteration from microflowers to nanoparticles and cations synergy (Co:Ni) in binder-free cobalt nickel vanadate thin film cathodes synthesized via SILAR method for hybrid supercapacitor devices. J Colloid Interface Sci 2024; 666:101-117. [PMID: 38588623 DOI: 10.1016/j.jcis.2024.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 03/30/2024] [Accepted: 04/01/2024] [Indexed: 04/10/2024]
Abstract
Electrode materials must be rationally designed with morphologies and electroactive sites manipulated through cations' synergy in bimetal compounds in order to maximize the performance of energy storage devices. Therefore, the present study emphasizes binder-free scalable preparation of cobalt nickel vanadate (CNV) thin films by a facile successive ionic layer adsorption and reaction (SILAR) approach with specific cations (Co:Ni) alternation. Increasing the Ni cation content in the CNV notably transforms its microflower structure comprising nanoflakes (252 nm) into nanoparticles (74 nm). An optimized S-CNV5 thin film cathode with Co:Ni molar ratio of ∼ 0.4:0.6 and a high specific surface area of 340 m2 g-1, provided the excellent specific capacitance (Csp) and capacity (Csc) of 1382 F g-1 and 691 C g-1, respectively at 1 A g-1 current density. A hybrid aqueous supercapacitor (HASc) device with positive and negative electrodes comprising optimized CNV and reduced graphene oxide (rGO), respectively, in a 1 M KOH electrolyte delivered a Csp of 133 F g-1 and a specific energy (SE) of 53 Wh kg-1 at a specific power (SP) of 2261 kW kg-1. Additionally, a fabricated hybrid solid-state supercapacitor (HSSc) device with the same electrodes applying PVA-KOH gel electrolyte displayed a Csp of 119 F g-1, and SE of 46 Wh kg-1 at SP of 1184 W kg-1. This boosted electrochemical activity is due to the synergetic effects of Ni and Co species in the CNV thin film electrodes, emphasizing the potential of CNV electrodes as cathodes in hybrid energy storage devices.
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Affiliation(s)
- Shraddha B Bhosale
- Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kasaba Bawada, Kolhapur 416006, India
| | - Sambhaji S Kumbhar
- Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kasaba Bawada, Kolhapur 416006, India
| | - Sumita S Patil
- Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kasaba Bawada, Kolhapur 416006, India
| | - Akshay Ransing
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Chandrakant D Lokhande
- Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kasaba Bawada, Kolhapur 416006, India
| | - Jayavant L Gunjakar
- Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kasaba Bawada, Kolhapur 416006, India
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
| | - Umakant M Patil
- Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kasaba Bawada, Kolhapur 416006, India; Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
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Wang Z, Li L, Heo H, Ren L, Wei Y, Lee K, Tian H, Xu Z, Sun Z, Kim T, Yang H, Park HH. Synthesis and characterization of core-shell high-nickel cobalt-free layered LiNi 0.95Mg 0.02Al 0.03O 2@Li 2ZrO 3 cathode for high-performance lithium ion batteries. J Colloid Interface Sci 2024; 666:424-433. [PMID: 38608637 DOI: 10.1016/j.jcis.2024.04.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 04/01/2024] [Accepted: 04/07/2024] [Indexed: 04/14/2024]
Abstract
High-nickel cobalt-free layered cathode is regarded as a highly potential cathode material for the next generation lithium ion batteries (LIBs) because of its high energy density, low cost and environmentally benign. However, the poor cycle performance caused by its intrinsic unstable structure and chemo-mechanical instability frustrates its practical applications. Herein, we have developed a new core-shell high-nickel cobalt-free layered LiNi0.95Mg0.02Al0.03O2@Li2ZrO3 (LZO-NMA9523) cathode for high-performance LIBs. The Li2ZrO3 coating layer firstly helps to suppress and reduce the degree of Li+/Ni2+ cation mixing during the material preparation process. In addition, the Li2ZrO3 coating layer can not only accommodate the volume variations and enhance the electricity of the active materials, but also effectively inhibit the harmful irreversible phase transition during the charging/discharging process, thus greatly stabilizing the structure of the high-nickel cobalt-free cathode. As an advanced cathode for LIBs, the LZO-NMA9523 exhibits an excellent reversible capacity of 146.9 mAh g-1 after 100 cycles at 0.5 C with capacity retention of about 80%. This study provides a possible high-nickel cobalt-free layered cathode material for the next generation LIBs.
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Affiliation(s)
- Zi Wang
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China; Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Lei Li
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China
| | - Hyunjee Heo
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Lulin Ren
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China
| | - Yumeng Wei
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China
| | - Kyuyeon Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Hao Tian
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China
| | - Zhengzheng Xu
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China
| | - Zhihua Sun
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China
| | - Taehee Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Hongxun Yang
- School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China.
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; Aerogel Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea.
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Parale VG, Kim T, Choi H, Phadtare VD, Dhavale RP, Kanamori K, Park HH. Mechanically Strengthened Aerogels through Multiscale, Multicompositional, and Multidimensional Approaches: A Review. Adv Mater 2024; 36:e2307772. [PMID: 37916304 DOI: 10.1002/adma.202307772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/29/2023] [Indexed: 11/03/2023]
Abstract
In recent decades, aerogels have attracted tremendous attention in academia and industry as a class of lightweight and porous multifunctional nanomaterial. Despite their wide application range, the low mechanical durability hinders their processing and handling, particularly in applications requiring complex physical structures. "Mechanically strengthened aerogels" have emerged as a potential solution to address this drawback. Since the first report on aerogels in 1931, various modified synthesis processes have been introduced in the last few decades to enhance the aerogel mechanical strength, further advancing their multifunctional scope. This review summarizes the state-of-the-art developments of mechanically strengthened aerogels through multicompositional and multidimensional approaches. Furthermore, new trends and future directions for as prevailed commercialization of aerogels as plastic materials are discussed.
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Affiliation(s)
- Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, South Korea
| | - Taehee Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, South Korea
| | - Haryeong Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, South Korea
| | - Varsha D Phadtare
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, South Korea
| | - Rushikesh P Dhavale
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, South Korea
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, South Korea
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Viltres H, Gupta NK, Paz R, Dhavale RP, Park HH, Leyva C, Srinivasan S, Rajabzadeh AR. Mercury remediation from wastewater through its spontaneous adsorption on non-functionalized inverse spinel magnetic ferrite nanoparticles. Environ Technol 2024; 45:1155-1168. [PMID: 36263910 DOI: 10.1080/09593330.2022.2138787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
In this study, inverse spinel cubic ferrites MFe2O4 (M = Fe2+, and Co2+) have been fabricated for the high-capacity adsorptive removal of Hg(II) ions. The PXRD analysis confirmed ferrites with the presence of residual NaCl. The surface area of Fe3O4 (Fe-F) and CoFe2O4 (Co-F) material was 69.1 and 45.2 m2 g-1, respectively. The Co-F and Fe-F showed the maximum Hg(II) adsorption capacity of 459 and 436 mg g-1 at pH 6. The kinetic and isotherms models suggested a spontaneous adsorption process involving chemical forces over the ferrite adsorbents. The Hg(II) adsorption process, probed by X-ray photoelectron spectroscopy (XPS), confirmed the interaction of Hg(II) ions with the surface hydroxyl groups via a complexation mechanism instead of proton exchange at pH 6 with the involvement of chloride ions. Thus, this study demonstrates a viable and cost-effective solution for the efficient remediation of Hg ions from wastewater using non-functionalized ferrite adsorbents. This study also systematically investigates the kinetics and isotherm mechanism of Hg(II) adsorption onto ferrites and reports one of the highest Hg(II) adsorption capacities among other ferrite-based adsorbents.
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Affiliation(s)
- Herlys Viltres
- School of Engineering Practice and Technology, McMaster University, Hamilton, Ontario, Canada
| | - Nishesh Kumar Gupta
- Department of Environmental Research, University of Science and Technology (UST), Daejeon, Korea
- Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, Korea
| | - Roxana Paz
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, CDMX, Mexico
| | - Rushikesh P Dhavale
- Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea
| | - Carolina Leyva
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, CDMX, Mexico
| | - Seshasai Srinivasan
- School of Engineering Practice and Technology, McMaster University, Hamilton, Ontario, Canada
| | - Amin Reza Rajabzadeh
- School of Engineering Practice and Technology, McMaster University, Hamilton, Ontario, Canada
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Hiremath V, Heo J, Park HH, Seo JG. Crystallinity swayed phase transformation and oxygen vacancy formation in TiO 2 aerogel photocatalysts. Environ Res 2023; 239:117409. [PMID: 37838191 DOI: 10.1016/j.envres.2023.117409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/10/2023] [Accepted: 10/11/2023] [Indexed: 10/16/2023]
Abstract
The lack of crystallinity of the aerogel materials has limited their significance which otherwise have found huge potential in wide variety of applications. In current work, we have developed TiO2 aerogels by solid-state gelation method using commercially available P25 and ST-01 (commercial Ishihara TiO2 Powder). The lack of crystallinity in the aerogel framework was resolved via utilizing crystalline TiO2 nanoparticles and the phase transformation was assessed as a function of phase composition. Via controlled solid-state gelation, surface area retention of 88.7% was achieved whereas the rutile-to-anatase weight fraction (WR) was considerably enhanced to 0.50. Interestingly, the phase transformation occurred only in P25, which suggests the mixed phase (anatase + rutile) composition as prerequisite for successful phase transformation. Favorably, TiO2 aerogels imbibe high degree of oxygen vacancies (Vo) responsible for photocatalytic applications. Interestingly, Vo induction is higher for the TiO2 with anatase phase composition (ST-01) followed by the sample with mixed phase composition (P25). The developed TiO2 aerogel photocatalysts were employed to dye degradation of Rhodamine B (RhB) and Methylene Blue (MB). The samples attained 94.8% and 96.8% degradation efficiency within 15 min for RhB and MB with nearly 2-fold improvement in the photocatalytic efficiency compared to parent P25 TiO2 respectively.
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Affiliation(s)
- Vishwanath Hiremath
- Department of Chemical Engineering, Hanyang University, Seoul, 04763, Republic of Korea; Center for Creative Convergence Education, Hanyang University, Seoul, 04763, Republic of Korea; Clean-Energy Research Institute, Hanyang University, Seoul, 04763, Republic of Korea
| | - Jayun Heo
- Department of Chemical Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Jeong Gil Seo
- Department of Chemical Engineering, Hanyang University, Seoul, 04763, Republic of Korea; Clean-Energy Research Institute, Hanyang University, Seoul, 04763, Republic of Korea.
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Nasri W, Driss Z, Djebali R, Lee KY, Park HH, Bezazi A, Reis PNB. Thermal Study of Carbon-Fiber-Reinforced Polymer Composites Using Multiscale Modeling. Materials (Basel) 2023; 16:7233. [PMID: 38005161 PMCID: PMC10673121 DOI: 10.3390/ma16227233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 11/26/2023]
Abstract
The layered fibers of carbon-fiber-reinforced polymer (CFRP) composites exhibit low thermal conductivity (TC) throughout their thickness due to the poor TC of the polymeric resin. Improved heat transmission inside the hydrogen storage tank during the filling process can reduce further compression work, and improved heat insulation can minimize energy loss. Therefore, it is crucial to understand the thermal properties of composites. This paper reports the thermal behavior of plain-woven CFRP composite using simulation at the micro-, meso-, and macro-scales. The TC was predicted numerically and compared to experimental findings and analytical models. Good results were found. Using the approach of multi-scale modeling, a parametric study was carried out to analyze in depth the influence of certain variables on thermal properties. The study revealed that both fiber volume fraction and temperature significantly influenced the TC of the composite, with the interphase fiber/matrix thickness following closely in terms of impact. The matrix porosity was found to have a relatively slighter impact, particularly within the porosity range of 5 to 15%.
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Affiliation(s)
- Wiem Nasri
- Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax (US), B.P. 1173, Road Soukra km 3.5, Sfax 3038, Tunisia;
| | - Zied Driss
- Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax (US), B.P. 1173, Road Soukra km 3.5, Sfax 3038, Tunisia;
| | - Ridha Djebali
- UR22ES12: Modeling, Optimization and Augmented Engineering, ISLAI Béja, University of Jendouba, Béja 9000, Tunisia;
| | - Kyu-Yeon Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (K.-Y.L.); (H.-H.P.)
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (K.-Y.L.); (H.-H.P.)
| | - Abderazak Bezazi
- Laboratory of Applied Mechanics of New Materials (LMANM), Université 8 Mai 1945—Guelma, B.P. 401, Guelma 24000, Algeria;
| | - Paulo N. B. Reis
- University of Coimbra, CEMMPRE, ARISE, Department of Mechanical Engineering, 3030-788 Coimbra, Portugal
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Kim J, Ravi S, Kim K, Choi Y, Park HH, Bae YS. Novel Porous Organic Polymer Catalyst with Phosphate and Sulfonic Acid Sites for Facile Esterification of Levulinic Acid. ACS Appl Mater Interfaces 2023; 15:48485-48494. [PMID: 37792023 DOI: 10.1021/acsami.3c08640] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Biomass-derived value-added materials such as levulinic acid (LA) are favorable natural resources for producing ester-based biolubricants owing to their biodegradability, nontoxicity, and excellent metal-adhering properties. However, highly active catalysts must be developed to carry out efficient esterification of LA with aliphatic alcohols, especially long-chain aliphatic alcohols. In this study, we developed a novel porous covalent organic polymer catalyst (BPOP-SO3H) with dual acid sites, phosphate and sulfonic acid sites, for the esterification of LA. The prepared BPOP-SO3H catalyst was verified using various surface analysis techniques. BPOP-SO3H exhibited 98% LA conversion with n-butanol and 99% selectivity for butyl levulinate ester within 30 min, which is superior to that of most reported catalysts. BPOP-SO3H also showed high LA conversion and ester selectivity when other aliphatic alcohols were used. Moreover, BPOP-SO3H showed good recyclability for five consecutive cycles. We believe that incorporating a high density of acid sites into a porous polymer with a large surface area and hierarchical pores is a promising approach for developing heterogeneous acid catalysts for the production of alkyl levulinate esters from LA.
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Affiliation(s)
- Jinwoo Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Seenu Ravi
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Kijun Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Yujin Choi
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Youn-Sang Bae
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
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Gupta NK, Leyva C, Viltres H, Dhavale RP, Kim KS, Romero-Galarza A, Park HH. Zinc-aluminum layered double hydroxide and double oxide for room-temperature oxidation of sulfur dioxide gas. Chemosphere 2023; 338:139503. [PMID: 37453522 DOI: 10.1016/j.chemosphere.2023.139503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 07/09/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023]
Abstract
Sulfur dioxide (SO2) gas at trace levels challenges the consumption of fuel gases and cleaning of flue gases originating from diverse anthropogenic sources. We have demonstrated Zn-Al layered double hydroxide (LDH) and layered double oxide (LDO) as low-cost and effective adsorbents in removing lowly concentrated SO2 gas at room temperature. Water in the adsorbent bed significantly improved the performance, where the maximum adsorption capacity of 38.0 mg g-1 was achieved for LDO. Based on the spectroscopic findings, the adsorbed gas molecules were oxidized to surface-bound sulfate/bisulfate species, showing complete mineralization of SO2 molecules. By employing an inexpensive NaOH-H2O2 solution-based regeneration strategy, we successfully regenerated the spent LDO, significantly restoring its gas uptake capacity. The regenerated oxide exhibited an increased gas uptake capacity ranging from 38.0 to 98.5 mg g-1, highlighting the practicality and economic feasibility of our approach. LDH/LDO materials are promising regenerable adsorbents for removing low concentrations of SO2 gas in ambient conditions.
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Affiliation(s)
- Nishesh Kumar Gupta
- Department of Environmental Research, University of Science and Technology (UST), Daejeon 34113, South Korea; Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, 10223, South Korea
| | - Carolina Leyva
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Legaria.694, Col. Irrigación Miguel Hidalgo, Mexico City, CDMX, 11500, Mexico.
| | - Herlys Viltres
- School of Engineering Practice and Technology, McMaster University, 1280 Main Street West Hamilton, Ontario, L8S 4L8, Canada
| | - Rushikesh P Dhavale
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, South Korea
| | - Kwang Soo Kim
- Department of Environmental Research, University of Science and Technology (UST), Daejeon 34113, South Korea; Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, 10223, South Korea.
| | - Adolfo Romero-Galarza
- Departamento de Ingeniería Química, Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Blvd. V. Carranza e Ing. José Cárdenas V. S/N, 25280, Saltillo, COAH, Mexico
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul, 03722, South Korea
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Ransing AA, Dhavale RP, Parale VG, Bangi UKH, Choi H, Lee W, Kim J, Wang Q, Phadtare VD, Kim T, Jung WK, Park HH. One-Pot Sol-Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties. Gels 2023; 9:651. [PMID: 37623106 PMCID: PMC10454204 DOI: 10.3390/gels9080651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/07/2023] [Accepted: 08/09/2023] [Indexed: 08/26/2023] Open
Abstract
Silica aerogels and their derivatives have outstanding thermal properties with exceptional values in the thermal insulation industry. However, their brittle nature restricts their large-scale commercialization. Thus, enhancing their mechanical strength without affecting their thermal insulating properties is essential. Therefore, for the first time, highly thermally stable poly(acrylamide-co-acrylic acid) partial sodium salt is used as a reinforcing polymer to synthesize hybrid P(AAm-CO-AAc)-silica aerogels via epoxy ring-opening polymerization in the present study. Functional groups in P(AAm-CO-AAc) partial sodium salts, such as CONH2 and COOH, acted as nucleophiles for the epoxy ring-opening reaction with (3-glycidyloxypropyl)trimethoxysilane, which resulted in a seven-fold enhancement in mechanical strength compared to that of pristine silica aerogel while maintaining thermal conductivity at less than 30.6 mW/mK and porosity of more than 93.68%. Moreover, the hybrid P(AAm-CO-AAc)-silica aerogel demonstrated improved thermal stability up to 343 °C, owing to the synergetic effect between the P(AAm-CO-AAc) and the silica aerogel, corresponding to the thermal stability and strong covalent bonding among them. These excellent results illustrate that this new synthetic approach for producing hybrid P(AAm-CO-AAc)-silica aerogels is useful for enhancing the mechanical strength of pristine silica aerogel without impairing its thermal insulating property and shows potential as an industrial heat insulation material.
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Affiliation(s)
- Akshay A. Ransing
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Rushikesh P. Dhavale
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Vinayak G. Parale
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Uzma K. H. Bangi
- Department of Physics, School of Physical Sciences, Punyashlok Ahilyadevi Holkar Solapur University, Solapur—Pune National Highway, Solapur 413 255, Maharashtra, India;
| | - Haryeong Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Wonjun Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Jiseung Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Qi Wang
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Varsha D. Phadtare
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Taehee Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
| | - Wook Ki Jung
- Agency for Defense Development (ADD), Daejeon 34146, Republic of Korea;
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea; (A.A.R.); (R.P.D.); (V.G.P.); (H.C.); (W.L.); (J.K.); (Q.W.); (V.D.P.); (T.K.)
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10
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Meti P, Wang Q, Mahadik DB, Lee KY, Gong YD, Park HH. Evolutionary Progress of Silica Aerogels and Their Classification Based on Composition: An Overview. Nanomaterials (Basel) 2023; 13:nano13091498. [PMID: 37177045 PMCID: PMC10180228 DOI: 10.3390/nano13091498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 04/18/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023]
Abstract
Aerogels are highly porous materials with fascinating properties prepared using sol-gel chemistry. Due to their unique physical and chemical properties, aerogels are recognized as potential candidates for diverse applications, including thermal insulation, sensor, environmental remediation, etc. Despite these applications, aerogels are not routinely found in our daily life because they are fragile and have highly limited scale-up productions. It remains extremely challenging to improve the mechanical properties of aerogels without adversely affecting their other properties. To boost the practical applications, it is necessary to develop efficient, low-cost methods to produce aerogels in a sustainable way. This comprehensive review surveys the progress in the development of aerogels and their classification based on the chemical composition of the network. Recent achievements in organic, inorganic, and hybrid materials and their outstanding physical properties are discussed. The major focus of this review lies in approaches that allow tailoring of aerogel properties to meet application-driven requirements. We begin with a brief discussion of the fundamental issues in silica aerogels and then proceed to provide an overview of the synthesis of organic and hybrid aerogels from various precursors. Organic aerogels show promising results with excellent mechanical strength, but there are still several issues that need further exploration. Finally, growing points and perspectives of the aerogel field are summarized.
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Affiliation(s)
- Puttavva Meti
- Innovative Drug Library Research Center, Department of Chemistry, Dongguk University, Seoul 04620, Republic of Korea
| | - Qi Wang
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - D B Mahadik
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Kyu-Yeon Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Young-Dae Gong
- Innovative Drug Library Research Center, Department of Chemistry, Dongguk University, Seoul 04620, Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
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11
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Parale VG, Choi H, Kim T, Phadtare VD, Dhavale RP, Lee KY, Panda A, Park HH. One pot synthesis of hybrid silica aerogels with improved mechanical properties and heavy metal adsorption: Synergistic effect of in situ epoxy-thiol polymerization and sol-gel process. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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12
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Mulik S, Dhas SD, Moholkar AV, Parale VG, Park HH, Koyale PA, Ghodake VS, Panda DK, Delekar SD. Square-Facet Nanobar MOF-Derived Co 3O 4@Co/N-doped CNT Core-Shell-based Nanocomposites as Cathode Materials for High-Performance Supercapacitor Studies. ACS Omega 2023; 8:2183-2196. [PMID: 36687033 PMCID: PMC9850747 DOI: 10.1021/acsomega.2c06369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 11/29/2022] [Indexed: 06/17/2023]
Abstract
The binary as well as ternary nanocomposites of the square-facet nanobar Co-MOF-derived Co3O4@Co/N-CNTs (N-CNTs: nitrogen-doped carbon nanotubes) with Ag NPs and rGO have been synthesized via an easy wet chemical route, and their supercapacitor behavior was then studied. At a controlled pH of the precursor solution, square-facet nanobars of Co-MOF were first synthesized by the solvothermal method and then pyrolyzed under a controlled nitrogen atmosphere to get a core-shell system of Co3O4@Co/N-CNTs. In the second step, different compositions of Co3O4@Co/N-CNT core-shell structures were formed by an ex-situ method with Ag NPs and rGO moieties. Among several bare, binary, and ternary compositions tested in 6 M aqueous KOH electrolyte, a ternary nanocomposite having a 7.0:1.5:1.5 stoichiometric ratio of Co3O4@Co/N-CNT, Ag NPs, and rGO, respectively, reported the highest specific capacitance (3393.8 F g-1 at 5 mV s-1). The optimized nanocomposite showed the energy density, power density, and Coulombic efficiency of 74.1 W h.kg-1, 443.7 W.kg-1, and 101.3%, respectively, with excellent electrochemical stability. After testing an asymmetrical supercapacitor with a Co3O4@Co/N-CNT/Ag NPs/rGO/nickel foam cathode and an activated carbon/nickel foam anode, it showed 4.9 W h.kg-1 of energy density and 5000.0 W.kg-1 of power density.
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Affiliation(s)
- Swapnajit
V. Mulik
- Department
of Chemistry, Shivaji University, Kolhapur416 004, Maharashtra, India
| | - Suprimkumar D. Dhas
- Thin
Film Nanomaterial, Department of Physics, Shivaji University, Kolhapur416 004, Maharashtra, India
| | - Annasaheb V. Moholkar
- Thin
Film Nanomaterial, Department of Physics, Shivaji University, Kolhapur416 004, Maharashtra, India
| | - Vinayak G. Parale
- Department
of Materials Science and Engineering, Yonsei
University, 50 Yonsei-ro,
Seodaemun-gu, Seoul03722, South Korea
| | - Hyung-Ho Park
- Department
of Materials Science and Engineering, Yonsei
University, 50 Yonsei-ro,
Seodaemun-gu, Seoul03722, South Korea
| | - Pramod A. Koyale
- Department
of Chemistry, Shivaji University, Kolhapur416 004, Maharashtra, India
| | - Vijay S. Ghodake
- Department
of Chemistry, Shivaji University, Kolhapur416 004, Maharashtra, India
| | - Dillip K. Panda
- Department
of Materials Science and Engineering, Clemson
University, Clemson, South Carolina29631, United States
| | - Sagar D. Delekar
- Department
of Chemistry, Shivaji University, Kolhapur416 004, Maharashtra, India
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13
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Alamdari S, Mirzaee O, Nasiri Jahroodi F, Tafreshi MJ, Ghamsari MS, Shik SS, Ara MHM, Lee KY, Park HH. Green synthesis of multifunctional ZnO/chitosan nanocomposite film using wild Mentha pulegium extract for packaging applications. Surf Interfaces 2022; 34:102349. [PMID: 36160476 PMCID: PMC9490491 DOI: 10.1016/j.surfin.2022.102349] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 05/16/2023]
Abstract
Following the global corona virus pandemic and environmental contamination caused by chemical plastic packaging, awareness of the need for environmentally friendly biofilms and antibacterial coatings is increasing. In this study, a biodegradable hybrid film, comprising of green-synthesized zinc oxide nanoparticles (ZnO NPs) with a chitosan (CS) matrix, was fabricated using a simple casting procedure. The ZnO NPs were synthesized using wild Mentha pulegium extract, and the synthesized NPs and films were characterized using different approaches. The structural, morphological, mechanical, antibacterial, and optical properties, as well as the hydrophilicity, of the prepared samples were investigated using various techniques. Gas chromatography-mass spectrometry measurements revealed the presence of phenolic compounds in the M. pulegium extract. In addition, a strong coordination connection between Zn2+ and the chitosan matrix was confirmed, which resulted in a good dispersion of ZnO in the chitosan film. The surface of the composite films was transparent, smooth, and uniform, and the flexible bio-based hybrid films exhibited significant antibacterial and antioxidant characteristics, strong visible emission in the 480 nm region, and UV-blocking properties. The ZnO/CS films displayed a potential to extend the shelf life of fruits by up to eight days when stored at 23°C, and also acted as an acceptable barrier against oxygen and water. The biodegradable ZnO/CS film is expected to keep fruit fresher than general chemical plastic films and be used for the packaging of active ingredients.
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Affiliation(s)
- Sanaz Alamdari
- Faculty of Physics, Semnan University, P.O. Box:35195‑363, Semnan, Iran
- Photonics Laboratory, Department of Physics, Kharazmi University, Alborz, Iran
- Nanophotonics Laboratory, Applied Science Research Center, Kharazmi University, Alborz, Iran
| | - Omid Mirzaee
- Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran
| | | | | | - Morteza Sasani Ghamsari
- Photonics & Quantum Technologies Research School, Nuclear Science, and Technology Research Institute, Tehran, 11155-3486, Iran
| | | | - Mohammad Hossein Majles Ara
- Photonics Laboratory, Department of Physics, Kharazmi University, Alborz, Iran
- Nanophotonics Laboratory, Applied Science Research Center, Kharazmi University, Alborz, Iran
| | - Kyu-Yeon Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Korea
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14
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Kim M, Rehman MA, Lee D, Wang Y, Lim DH, Khan MF, Choi H, Shao QY, Suh J, Lee HS, Park HH. Filamentary and Interface-Type Memristors Based on Tantalum Oxide for Energy-Efficient Neuromorphic Hardware. ACS Appl Mater Interfaces 2022; 14:44561-44571. [PMID: 36164762 DOI: 10.1021/acsami.2c12296] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
To implement artificial neural networks (ANNs) based on memristor devices, it is essential to secure the linearity and symmetry in weight update characteristics of the memristor, and reliability in the cycle-to-cycle and device-to-device variations. This study experimentally demonstrated and compared the filamentary and interface-type resistive switching (RS) behaviors of tantalum oxide (Ta2O5 and TaO2)-based devices grown by atomic layer deposition (ALD) to propose a suitable RS type in terms of reliability and weight update characteristics. Although Ta2O5 is a strong candidate for memristor, the filament-type RS behavior of Ta2O5 does not fit well with ANNs demanding analog memory characteristics. Therefore, this study newly designed an interface-type TaO2 memristor and compared it to a filament type of Ta2O5 memristor to secure the weight update characteristics and reliability. The TaO2-based interface-type memristor exhibited gradual RS characteristics and area dependency in both high- and low-resistance states. In addition, compared to the filamentary memristor, the RS behaviors of the TaO2-based interface-type device exhibited higher suitability for the neuromorphic, symmetric, and linear long-term potentiation (LTP) and long-term depression (LTD). These findings suggest better types of memristors for implementing ionic memristor-based ANNs among the two types of RS mechanisms.
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Affiliation(s)
- Minjae Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Malik Abdul Rehman
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Donghyun Lee
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Yue Wang
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Dong-Hyeok Lim
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Muhammad Farooq Khan
- Department of Electrical Engineering, Sejong University, Seoul 05006, South Korea
| | - Haryeong Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Qing Yi Shao
- Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
| | - Joonki Suh
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Hong-Sub Lee
- Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi-do 17104, Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
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15
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Shinde RB, Padalkar NS, Sadavar SV, Kale SB, Magdum VV, Chitare YM, Kulkarni SP, Patil UM, Parale VG, Park HH, Gunjakar JL. 2D-2D lattice engineering route for intimately coupled nanohybrids of layered double hydroxide and potassium hexaniobate: Chemiresistive SO 2 sensor. J Hazard Mater 2022; 432:128734. [PMID: 35334269 DOI: 10.1016/j.jhazmat.2022.128734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 03/05/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
2D-2D lattice engineering route is used to synthesize intimately coupled nanohybrids of layered double hydroxide (LDH) and potassium hexaniobate. The 2D-2D lattice engineering route is based on the electrostatically derived self-assembly of delaminated zinc-chromium-layered double hydroxide (ZC-LDH) nanosheets and potassium hexaniobate (HNb) nanosheets (ZCNb nanohybrids). The 2D-2D lattice-engineered ZCNb nanohybrids display expanded surface area, mesoporous anchored nanosheets network morphology, and intimate coupling between nanosheets. The 2D-2D lattice engineered ZCNb nanohybrids are used for the low temperature operated gas sensor. The ZCNb nanohybrids display outstanding selectivity for the SO2, with the high response of 61.5% compared to pristine ZC-LDH (28.08%) and potassium niobate (8%) at 150 °C. Moreover, ZCNb sensors demonstrate superior response and recovery periods of 6 and 167 s at 150 °C, respectively. This result underscores the exceptional functionality of the ZCNb nanohybrids as efficient SO2 sensors. Moreover, these findings vividly demonstrate that the 2D-2D lattice-engineered ZCNb nanohybrids are quite effective not only in improving the gas sensor activity but also in developing of new type of intimately coupled mesoporous LDH-metal-oxide based hybrid materials.
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Affiliation(s)
- Rohini B Shinde
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Navnath S Padalkar
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Shrikant V Sadavar
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Shital B Kale
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Vikas V Magdum
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Yogesh M Chitare
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Shirin P Kulkarni
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Umakant M Patil
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India
| | - Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Jayavant L Gunjakar
- Centre for Interdisciplinary Research, D. Y. Patil Education Society (Institution Deemed to be University), Kolhapur 416 006, Maharastra, India.
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16
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Wang Y, Kim M, Rehman MA, Chabungbam AS, Kim DE, Lee HS, Kymissis I, Park HH. Bipolar Resistive Switching in Lanthanum Titanium Oxide and an Increased On/Off Ratio Using an Oxygen-Deficient ZnO Interlayer. ACS Appl Mater Interfaces 2022; 14:17682-17690. [PMID: 35394742 DOI: 10.1021/acsami.2c03451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The present study pioneered an oxygen migration-driven metal to insulator transition Mott memory, a new type of nonvolatile memory using lanthanum titanium oxide (LTO). We first show the reset first bipolar property without an initial electroforming process in LTO. We used oxygen-deficient ZnO as an interlayer between LTO and a W electrode to clarify whether oxygen migration activates LTO as the Mott transition. ZnO oxygen deficiency provides oxygen ion migration paths as well as a reservoir, facilitating oxygen migration from LTO to the W electrode. Thus, including the ZnO interlayer improved oxygen migration between LTO and the W electrode, achieving a 10-fold increased on/off current ratio. The current research contributes to a better understanding of valence change Mott memory by exploring the LTO resistive switching mechanism and ZnO interlayer influences on the oxygen migration process.
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Affiliation(s)
- Yue Wang
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Minjae Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Malik Abdul Rehman
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Akendra Singh Chabungbam
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Dong-Eun Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Hong Sub Lee
- Department of Materials Science and Engineering, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Ioannis Kymissis
- Department of Electrical Engineering, Columbia University, New York, New York 10027, United States
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
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17
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Kim SM, Kim S, Ling L, Liu SE, Jin S, Jung YM, Kim M, Park HH, Sangwan VK, Hersam MC, Lee HS. Linear and Symmetric Li-Based Composite Memristors for Efficient Supervised Learning. ACS Appl Mater Interfaces 2022; 14:5673-5681. [PMID: 35043617 DOI: 10.1021/acsami.1c24562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Emerging energy-efficient neuromorphic circuits are based on hardware implementation of artificial neural networks (ANNs) that employ the biomimetic functions of memristors. Specifically, crossbar array memristive architectures are able to perform ANN vector-matrix multiplication more efficiently than conventional CMOS hardware. Memristors with specific characteristics, such as ohmic behavior in all resistance states in addition to symmetric and linear long-term potentiation/depression (LTP/LTD), are required in order to fully realize these benefits. Here, we demonstrate a Li-based composite memristor (LCM) that achieves these objectives. The LCM consists of three phases: Li-doped TiO2 as a Li reservoir, Li4Ti5O12 as the insulating phase, and Li7Ti5O12 as the metallic phase, where resistive switching correlates with the change in the relative fraction of the metallic and insulating phases. The LCM exhibits a symmetric and gradual resistive switching behavior for both set and reset operations during a full bias sweep cycle. This symmetric and linear weight update is uniquely enabled by the symmetric bidirectional migration of Li ions, which leads to gradual changes in the relative fraction of the metallic phase in the film. The optimized LCM in ANN simulation showed that exceptionally high accuracy in image classification is realized in fewer training steps compared to the nonlinear behavior of conventional memristors.
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Affiliation(s)
- Su-Min Kim
- Department of Materials Science & Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon24341, Korea
| | - Sungkyu Kim
- HMC, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul05006, Republic of Korea
| | - Leo Ling
- Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois60208, United States
| | - Stephanie E Liu
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, United States
| | - Sila Jin
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon24341, Korea
| | - Young Mee Jung
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon24341, Korea
- Institute of Quantum Convergence Technology, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon 24341, Korea
| | - Minjae Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul03772, Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul03772, Republic of Korea
| | - Vinod K Sangwan
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, United States
| | - Mark C Hersam
- Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois60208, United States
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois60208, United States
- Department of ChemistryNorthwestern University, Evanston, Illinois60208, United States
| | - Hong-Sub Lee
- Department of Materials Science & Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon24341, Korea
- Institute of Quantum Convergence Technology, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon 24341, Korea
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18
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Kim T, Roy SB, Moon S, Yoo S, Choi H, Parale VG, Kim Y, Lee J, Jun SC, Kang K, Chun SH, Kanamori K, Park HH. Highly Dispersed Pt Clusters on F-Doped Tin(IV) Oxide Aerogel Matrix: An Ultra-Robust Hybrid Catalyst for Enhanced Hydrogen Evolution. ACS Nano 2022; 16:1625-1638. [PMID: 36350111 DOI: 10.1021/acsnano.1c10504] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Dispersing the minuscule mass loading without hampering the high catalytic activity and long-term stability of a noble metal catalyst results in its ultimate efficacy for the electrochemical hydrogen evolution reaction (HER). Despite being the most efficient HER catalyst, the use of Pt is curtailed due to its scarcity and tendency to leach out in the harsh electrochemical reaction environment. In this study, we combined F-doped tin(IV) oxide (F-SnO2) aerogel with Pt catalyst to prevent metallic corrosion and to achieve abundant Pt active sites (approximately 5 nm clusters) with large specific surface area (321 cm2·g-1). With nanoscopic Pt loading inside the SnO2 aerogel matrix, the as-synthesized hybrid F-SnO2@Pt possesses a large specific surface area and high porosity and, thus, exhibits efficient experimental and intrinsic HER activity (a low overpotential of 42 mV at 10 mA·cm-2 in 0.5 M sulfuric acid), a 22-times larger turnover frequency (11.2 H2·s-1) than that of Pt/C at 50 mV, and excellent robustness over 10,000 cyclic voltammetry cycles. The existing metal support interaction and strong intermolecular forces between Pt and F-SnO2 account for the catalytic superiority and persistence against corrosion of F-SnO2@Pt compared to commercially used Pt/C. Density functional theory analysis suggests that hybridization between the Pt and F-SnO2 orbitals enhances intermediate hydrogen atom (H*) adsorption at their interface, which improves the reaction kinetics.
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Affiliation(s)
- Taehee Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Sanjib Baran Roy
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Sunil Moon
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
| | - SangHyuk Yoo
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
| | - Haryeong Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Younghun Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Jihun Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Seong Chan Jun
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
| | - Keonwook Kang
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
| | - Seung-Hyun Chun
- Department of Physics, Sejong University, Seoul 05006, Korea
| | | | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
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19
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Katkar PK, Marje SJ, Parale VG, Lokhande CD, Gunjakar JL, Park HH, Patil UM. Fabrication of a High-Performance Hybrid Supercapacitor Based on Hydrothermally Synthesized Highly Stable Cobalt Manganese Phosphate Thin Films. Langmuir 2021; 37:5260-5274. [PMID: 33886316 DOI: 10.1021/acs.langmuir.1c00243] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In the present study, cobalt manganese phosphate (H-CMP-series) thin films with different compositions of Co/Mn are prepared on stainless steel (SS) substrate via a facile hydrothermal method and employed as binder-free cathode electrodes in a hybrid supercapacitor. The XRD study reveals a monoclinic crystal structure, and the FE-SEM analysis confirmed that H-CMP-series samples displayed a nano/microarchitecture (microflowers to nanoflakes) on the surface of SS substrate with excess available surfaces and unique sizes. Interestingly, the synergy between cobalt and manganese species in the cobalt manganese phosphate thin film electrode demonstrates a maximum specific capacitance of 571 F g-1 at a 2.2 A g-1 current density in 1 M KOH. Besides, the nano/microstructured cobalt manganese phosphate was able to maintain capacitance retention of 88% over 8000 charge-discharge cycles. More importantly, the aqueous/all-solid-state asymmetric supercapacitor manufactured with the cobalt manganese phosphate thin film as the cathode and reduced graphene oxide (rGO) as the anode displays a high operating potential window of 1.6 V. The aqueous asymmetric device exhibited a maximum specific capacitance of 128 F g-1 at a current density of 1 A g-1 with an energy density of 45.7 Wh kg-1 and a power density of 1.65 kW kg-1. In addition, the all-solid-state asymmetric supercapacitor device provides a high specific capacitance of 37 F g-1 at 1 A g-1 with 13.3 Wh kg-1 energy density and 1.64 kW kg-1 power density in a polymer gel (PVA-KOH) electrolyte. The long cyclic life of both devices (87 and 84%, respectively, after 6000 cycles) and practical demonstration of the solid-state device (lighting of a LED lamp) suggest another alternative choice for cathode materials to develop stable energy storage devices with high energy density. Furthermore, the aforementioned study paves the way to investigate phosphate-based materials as a new class of materials for supercapacitor applicability.
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Affiliation(s)
- Pranav K Katkar
- Centre for Interdisciplinary Research, D. Y. Education Society (Deemed to be University), Kasaba Bawada, Kolhapur 416 006, Maharashtra, India
| | - Supriya J Marje
- Centre for Interdisciplinary Research, D. Y. Education Society (Deemed to be University), Kasaba Bawada, Kolhapur 416 006, Maharashtra, India
| | - Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Chandrakant D Lokhande
- Centre for Interdisciplinary Research, D. Y. Education Society (Deemed to be University), Kasaba Bawada, Kolhapur 416 006, Maharashtra, India
| | - Jayavant L Gunjakar
- Centre for Interdisciplinary Research, D. Y. Education Society (Deemed to be University), Kasaba Bawada, Kolhapur 416 006, Maharashtra, India
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Umakant M Patil
- Centre for Interdisciplinary Research, D. Y. Education Society (Deemed to be University), Kasaba Bawada, Kolhapur 416 006, Maharashtra, India
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Kim M, Lee N, Yang JH, Han CW, Kim HM, Han W, Park HH, Yang H, Kim J. High-efficiency quantum dot light-emitting diodes based on Li-doped TiO 2 nanoparticles as an alternative electron transport layer. Nanoscale 2021; 13:2838-2842. [PMID: 33508043 DOI: 10.1039/d0nr05920j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We report high-efficiency quantum dot light-emitting diodes (QLEDs) with Li-doped TiO2 nanoparticles (NPs) as an alternative electron transport layer (ETL). Colloidally stable TiO2 NPs are applied as ETLs of inverted structured QLEDs and the effect of the addition of lithium (Li) to TiO2 NPs on device characteristics is studied in detail. Compared to pristine TiO2 NPs, Li-doped ones are found to be beneficial for the charge balance in the emitting layer of QLEDs mainly by means of their upshifted conduction band minimum, which in turn limits electron injection. A green QLED with 5% Li-doped TiO2 NPs produces a maximum luminance of 169 790 cd m-2, an EQE of 10.27%, and a current efficiency of 40.97 cd A-1, which indicate the best device performances to date among QLEDs with non-ZnO inorganic ETLs. These results indicate that Li-doped TiO2 NPs show great promise for use as a solution-based inorganic ETL for future QLEDs.
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Affiliation(s)
- Moonbon Kim
- Department of Advanced Materials Engineering, Kyonggi University, Suwon 16227, Republic of Korea.
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Lim SS, Kim KC, Jeon H, Kim JY, Kang JY, Park HH, Baek SH, Kim JS, Kim SK. Enhanced thermal stability of Bi2Te3-based alloys via interface engineering with atomic layer deposition. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2020.04.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Lim SS, Jung SJ, Kim BK, Kim DI, Lee BH, Won SO, Shin J, Park HH, Kim SK, Kim JS, Baek SH. Combined hot extrusion and spark plasma sintering method for producing highly textured thermoelectric Bi2Te3 alloys. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2020.03.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bangi UK, Gafari RS, Pawar RC, Jung HNR, Park HH. Influence of Glycerol Additive on the Chemical Structure, Hydrophobicity, Morphology and Optical Properties of Sol-gel Based Zirconia Coatings. ACTA ACUST UNITED AC 2020. [DOI: 10.30919/esmm5f937] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Hoshyarmanesh H, Ghodsi M, Kim M, Cho HH, Park HH. Temperature Effects on Electromechanical Response of Deposited Piezoelectric Sensors Used in Structural Health Monitoring of Aerospace Structures. Sensors (Basel) 2019; 19:s19122805. [PMID: 31234514 PMCID: PMC6631685 DOI: 10.3390/s19122805] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 06/15/2019] [Accepted: 06/18/2019] [Indexed: 12/03/2022]
Abstract
Turbomachine components used in aerospace and power plant applications preferably require continuous structural health monitoring at various temperatures. The structural health of pristine and damaged superalloy compressor blades of a gas turbine engine was monitored using real electro-mechanical impedance of deposited thick film piezoelectric transducers at 20 and 200 °C. IVIUM impedance analyzer was implemented in laboratory conditions for damage detection in superalloy blades, while a custom-architected frequency-domain transceiver circuit was used for semi-field circumstances. Recorded electromechanical impedance signals at 20 and 200 °C acquired from two piezoelectric wafer active sensors bonded to an aluminum plate, near and far from the damage, were initially utilized for accuracy and reliability verification of the transceiver at temperatures >20 °C. Damage formation in both the aluminum plate and blades showed a peak shift in the swept frequency along with an increase in the amplitude and number of impedance peaks. The thermal energy at 200 °C, on the other hand, enforces a further subsequent peak shift in the impedance signal to pristine and damaged parts such that the anti-resonance frequency keeps reducing as the temperature increases. The results obtained from the impedance signals of both piezoelectric wafers and piezo-films, revealed that increasing the temperature somewhat decreased the real impedance amplitude and the number of anti-resonance peaks, which is due to an increase in permittivity and capacitance of piezo-sensors. A trend is also presented for artificial intelligence training purposes to distinguish the effect of the temperature versus damage formation in sample turbine compressor blades. Implementation of such a monitoring system provides a distinct advantage to enhance the safety and functionality of critical aerospace components working at high temperatures subjected to crack, wear, hot-corrosion and erosion.
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Affiliation(s)
- Hamidreza Hoshyarmanesh
- Project neuroArm, Health Research Innovation Center, University of Calgary, Calgary, AB T2N 4Z6, Canada.
| | - Mojtaba Ghodsi
- Department of Mechanical and Industrial Engineering, Sultan Qaboos University, Muscat 123, Sultanate of Oman.
| | - Minjae Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
| | - Hyung Hee Cho
- School of Mechanical Engineering, Yonsei University, Seoul 03722, Korea.
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
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Hong MH, Han W, Lee KY, Park HH. The thermoelectric properties of Au nanoparticle-incorporated Al-doped mesoporous ZnO thin films. R Soc Open Sci 2019; 6:181799. [PMID: 31218027 PMCID: PMC6549978 DOI: 10.1098/rsos.181799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 03/26/2019] [Indexed: 06/09/2023]
Abstract
Mesoporous Al-doped ZnO thin films incorporated with gold nanoparticles (Au NPs) were synthesized using a sol-gel and evaporation-induced self-assembly process. In this study, the complementary effects of Au NP incorporation and Al doping on the thermoelectric properties of mesoporous ZnO thin films were analysed. The incorporated Au NPs induced an increase in electrical conductivity but a detriment in the pore arrangement of the mesoporous ZnO thin film, which was accompanied by a decrease in porosity. However, the addition of the Al dopant minimized the pore structural collapse because of the inhibition of the grain growth in the ZnO skeletal structure, resulting in the enhancement of the pore arrangement and porosity. When the Au NPs and Al dopant were added at the same time, the degradation in the pore structure was minimized and the electrical conductivity was effectively increased, but the absolute value of the Seebeck coefficient was decreased. However, as a result, the thermoelectric power factor was increased by 2.4 times compared to that of the pristine mesoporous ZnO thin film. It was found that co-introducing the Au NPs and Al doping to the mesoporous ZnO structure was effective in preserving the pore structure and increasing the electric conductivity, thereby enhancing the thermoelectric property of the mesoporous ZnO thin film.
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Kim T, Parale VG, Jung HNR, Kim Y, Driss Z, Driss D, Bouabidi A, Euchy S, Park HH. Facile Synthesis of SnO₂ Aerogel/Reduced Graphene Oxide Nanocomposites via in Situ Annealing for the Photocatalytic Degradation of Methyl Orange. Nanomaterials (Basel) 2019; 9:nano9030358. [PMID: 30836632 PMCID: PMC6473939 DOI: 10.3390/nano9030358] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/25/2019] [Accepted: 02/27/2019] [Indexed: 11/16/2022]
Abstract
SnO₂ aerogel/reduced graphene oxide (rGO) nanocomposites were synthesized using the sol⁻gel method. A homogeneous dispersion of graphene oxide (GO) flakes in a tin precursor solution was captured in a three-dimensional network SnO₂ aerogel matrix and successively underwent supercritical alcohol drying followed by the in situ thermal reduction of GO, resulting in SnO₂ aerogel/rGO nanocomposites. The chemical interaction between aerogel matrix and GO functional groups was confirmed by a peak shift in the Fourier transform infrared spectra and a change in the optical bandgap of the diffuse reflectance spectra. The role of rGO in 3D aerogel structure was studied in terms of photocatalytic activity with detailed mechanism of the enhancement such as electron transfer between the GO and SnO₂. In addition, the photocatalytic activity of these nanocomposites in the methyl orange degradation varied depending on the amount of rGO loading in the SnO₂ aerogel matrix; an appropriate amount of rGO was required for the highest enhancement in the photocatalytic activity of the SnO₂ aerogel. The proposed nanocomposites could be a useful solution against water pollutants.
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Affiliation(s)
- Taehee Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
| | - Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
| | - Hae-Noo-Ree Jung
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
| | - Younghun Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
| | - Zied Driss
- Laboratory of Electromechanical Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax, PO Box 1173, Route Soukra km 3.5, 3038 Sfax, Tunisia.
| | - Dorra Driss
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax (CBS), University of Sfax, PO Box 1177, Road Sidi Mansour km 6, 3018 Sfax, Tunisia.
| | - Abdallah Bouabidi
- Laboratory of Electromechanical Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax, PO Box 1173, Route Soukra km 3.5, 3038 Sfax, Tunisia.
| | - Souhir Euchy
- Laboratory of Electromechanical Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax, PO Box 1173, Route Soukra km 3.5, 3038 Sfax, Tunisia.
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
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Choi H, Parale VG, Lee KY, Nah HY, Driss Z, Driss D, Bouabidi A, Euchy S, Park HH. Polypropylene/Silica Aerogel Composite Incorporating a Conformal Coating of Methyltrimethoxysilane-Based Aerogel. J Nanosci Nanotechnol 2019; 19:1376-1381. [PMID: 30469191 DOI: 10.1166/jnn.2019.16257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Silica aerogels possess low thermal conductivity but have a brittle nature, while their polymers tend to exhibit enhanced mechanical properties. In this study, we introduce a new approach to overcoming this brittle property of silica aerogels. Polypropylene/silica aerogel composites were prepared by thermally induced phase separation followed by a supercritical CO₂ drying method. Silica aerogel was formed onto a polypropylene scaffold using a two-step sol-gel process with methyltrimethoxysilane as the silica precursor. Enhancement of the mechanical properties of the polypropylene/silica aerogel composite compared with a pristine methyltrimethoxysilane-based silica aerogel was observed. The effects of the latter on the microstructure and physical properties of the polypropylene/silica aerogel (hereafter referred to as the polymer matrix aerogel) composite were investigated. Compared with the polypropylene monolith, the polymer matrix aerogel composite demonstrated enhanced surface-chemical and microporous-structural properties such as higher hydrophobicity (135°), pore volume (0.18 cm³/g), average pore diameter (12.55 nm), and specific surface area (57.2 m²/g). This novel approach of incorporating methyltrimethoxysilane-based silica aerogel onto polypropylene when synthesizing the polymer matrix aerogel composite shows great potential as a durable superhydrophobic and corrosion resistant thermal insulating material.
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Affiliation(s)
- Haryeong Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Vinayak G Parale
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Kyu-Yeon Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Ha-Yoon Nah
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Zied Driss
- Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of SENIS), University of Sfax, 3.5 Soukra, 3038 Sfax, Tunisia
| | - Dorra Driss
- Centre de Biotechnologie de Sfax, Route de Sidi Mansour km 6, 3018 Sfax, Tunisia
| | - Abdallah Bouabidi
- Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of SENIS), University of Sfax, 3.5 Soukra, 3038 Sfax, Tunisia
| | - Souhir Euchy
- Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of SENIS), University of Sfax, 3.5 Soukra, 3038 Sfax, Tunisia
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
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Bangi UKH, Lee KY, Maldar NMN, Park HH. Synthesis and Properties of Metal Oxide Aerogels via Ambient Pressure Drying. J Nanosci Nanotechnol 2019; 19:1217-1227. [PMID: 30469167 DOI: 10.1166/jnn.2019.16240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metal oxide aerogels such as zirconia (ZrO₂), titania (TiO₂), and alumina (Al₂O₃) aerogels are very interesting nanoporous materials applicable as thermal insulators, catalysts, sensors, and so on. To obtain the aerogels, the first key step is a sol-gel process to prepare the gel followed by either supercritical drying, ambient pressure drying, or freeze-drying. Although the expensive and energy-intensive supercritical drying method restricts the commercialization of the aerogels, ambient pressure drying has shown great potential as an alternative and very simple method for aerogel synthesis. The sol-gel method and preparation parameters such as hydrolysis water, the silylating agent concentration, and the thermal treatment temperature have a profound impact on the textural and structural properties of the aerogels. Therefore, in this review, we study the synthesis and the influence of these parameters on the properties of metal oxide aerogels via ambient pressure drying.
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Affiliation(s)
- Uzma K H Bangi
- School of Physical Sciences, Solapur University, Solapur-Pune National Highway, Kegaon, Solapur 413255, Maharashtra, India
| | - Kyu-Yeon Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Noor Mahmad N Maldar
- Polymer Chemistry Division, Solapur University, Solapur - Pune National Highway, Kegaon, Solapur 413255, Maharashtra, India
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
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Moon HG, Jung Y, Jun D, Park JH, Chang YW, Park HH, Kang CY, Kim C, Kaner RB. Hollow Pt-Functionalized SnO 2 Hemipill Network Formation Using a Bacterial Skeleton for the Noninvasive Diagnosis of Diabetes. ACS Sens 2018; 3:661-669. [PMID: 29411965 DOI: 10.1021/acssensors.7b00955] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Hollow-structured nanomaterials are presented as an outstanding sensing platform because of their unique combination of high porosity in both the micro- and nanoscale, their biocompatibility, and flexible template applicability. Herein, we introduce a bacterial skeleton method allowing for cost-effective fabrication with nanoscale precision. As a proof-of-concept, we fabricated a hollow SnO2 hemipill network (HSHN) and a hollow Pt-functionalized SnO2 hemipill network (HPN). A superior detecting capability of HPN toward acetone, a diabetes biomarker, was demonstrated at low concentration (200 ppb) under high humidity (RH 80%). The detection limit reaches 3.6 ppb, a level satisfying the minimum requirement for diabetes breath diagnosis. High selectivity of the HPN sensor against C6H6, C7H8, CO, and NO vapors is demonstrated using principal component analysis (PCA), suggesting new applications of HPN for human-activity monitoring and a personal healthcare tool for diagnosing diabetes. The skeleton method can be further employed to mimic nanostructures of biomaterials with unique functionality for broad applications.
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Affiliation(s)
| | | | | | - Ji Hyun Park
- Institute for Pure and Applied Mathematics, University of California, Los Angeles, California 90095, United States
| | - Young Wook Chang
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
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Han W, Kim T, Yoo B, Park HH. Tunable Dielectric Properties of Poly(vinylidenefluoride-co-hexafluoropropylene) Films with Embedded Fluorinated Barium Strontium Titanate Nanoparticles. Sci Rep 2018; 8:4086. [PMID: 29511304 PMCID: PMC5840133 DOI: 10.1038/s41598-018-22442-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 02/22/2018] [Indexed: 11/09/2022] Open
Abstract
Fluoropolymer nanocomposites of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) were prepared using fluorinated barium strontium titanate (Ba1-xSrxTiO3, BSTO) nanoparticles (NPs) by low-temperature synthesis using a modified liquid-solid solution process. The exact stoichiometry of as-synthesized BSTO NPs was confirmed by X-ray diffraction analysis along with lattice parameter calculations. The synthesized BSTO NPs were fluorinated using 2,2,2-trifluoroacetic acid as a fluorous ligand. The BSTO NPs showed high solubility in the fluorous system (polymer and solvent) on account of their modified surface. The root-mean-square roughness of the fluorinated BSTO/PVdF-HFP nanocomposite was 76 times lower than that of the nonfluorinated BSTO/PVdF-HFP nanocomposite. The dielectric constant of the fluorinated BSTO/PVdF-HFP nanocomposite exhibited Curie temperature behavior. The dielectric constant of the nanocomposite predicted using the modified Kerner model at room temperature agreed well with the experimental values.
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Affiliation(s)
- Wooje Han
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Taehee Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Byungwook Yoo
- Flexible Display Research Center, Korea Electronics Technology Institute, Seongnam, Gyeonggi, 13509, Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
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Nam WH, Kim BB, Lim YS, Dae KS, Seo WS, Park HH, Lee JY. Phonon-glass electron-crystals in ZnO-multiwalled carbon nanotube nanocomposites. Nanoscale 2017; 9:12941-12948. [PMID: 28831489 DOI: 10.1039/c7nr03747c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We propose a strategy for enhancing thermoelectric performance through the realization of a 'phonon-glass electron-crystal' (PGEC) by interface control using multiwalled carbon nanotubes (MWCNTs). By the consolidation of undoped ZnO nanoparticles with MWCNTs (0.5, 1, and 2 wt%) using spark plasma sintering, we fabricated the interface-controlled ZnO-MWCNT nanocomposites, in which ZnO grains were surrounded with a MWCNT network. Both single crystal-like charge transport (electron-crystal) and considerably reduced thermal conductivity (phonon-glass) were achieved simultaneously thanks to the beneficial effects of the MWCNT network, and this led to the enhancement of the thermoelectric figure of merit. We discussed these findings on PGECs in the ZnO-MWCNT nanocomposites from the viewpoint of interface control in detail, and our strategy may provide a promising way to the realization of PGEC in other hybrid thermoelectric materials.
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Affiliation(s)
- Woo Hyun Nam
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, 34141, Korea
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Bangi UKH, Park HH, Han W, Prakshale VM, Deshmukh LP. Ultrasonically assisted synthesis of lead oxide nanoflowers using ball milling. Int Nano Lett 2017. [DOI: 10.1007/s40089-017-0209-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
Nanoscale ZnO is one of the best choices for ultraviolet (UV) protection, not only because of its antimicrobial properties but also due to its potential application for UV preservation. However, the behavior of nanostructured thin ZnO films and long-term effects of UV-radiation exposure have not been studied yet. In this study, we investigated the UV-protection ability of sol gel-derived thin ZnO films after different exposure times. Scanning electron microscopy, atomic force microscopy, and UV-visible optical spectroscopy were carried out to study the structure and optical properties of the ZnO films as a function of the UV-irradiation time. The results obtained showed that the prepared thin ZnO films were somewhat transparent under the visible wavelength region and protective against UV radiation. The UV-protection factor was 50+ for the prepared samples, indicating that they were excellent UV protectors. The deposited thin ZnO films demonstrated promising antibacterial potential and significant light absorbance in the UV range. The experimental results suggest that the synthesized samples have potential for applications in the health care field.
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Affiliation(s)
- Morteza Sasani Ghamsari
- Laser and Optics Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Sanaz Alamdari
- Laser and Optics Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Wooje Han
- Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea
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Lee KY, Jung HNR, Mahadik D, Park HH. Characterization of Mechanical Property Change in Polymer Aerogels Depending on the Ligand Structure of Acrylate Monomer. ACTA ACUST UNITED AC 2016. [DOI: 10.6117/kmeps.2016.23.3.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Moon HG, Jung Y, Han SD, Shim YS, Shin B, Lee T, Kim JS, Lee S, Jun SC, Park HH, Kim C, Kang CY. Chemiresistive Electronic Nose toward Detection of Biomarkers in Exhaled Breath. ACS Appl Mater Interfaces 2016; 8:20969-76. [PMID: 27456161 DOI: 10.1021/acsami.6b03256] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Detection of gas-phase chemicals finds a wide variety of applications, including food and beverages, fragrances, environmental monitoring, chemical and biochemical processing, medical diagnostics, and transportation. One approach for these tasks is to use arrays of highly sensitive and selective sensors as an electronic nose. Here, we present a high performance chemiresistive electronic nose (CEN) based on an array of metal oxide thin films, metal-catalyzed thin films, and nanostructured thin films. The gas sensing properties of the CEN show enhanced sensitive detection of H2S, NH3, and NO in an 80% relative humidity (RH) atmosphere similar to the composition of exhaled breath. The detection limits of the sensor elements we fabricated are in the following ranges: 534 ppt to 2.87 ppb for H2S, 4.45 to 42.29 ppb for NH3, and 206 ppt to 2.06 ppb for NO. The enhanced sensitivity is attributed to the spillover effect by Au nanoparticles and the high porosity of villi-like nanostructures, providing a large surface-to-volume ratio. The remarkable selectivity based on the collection of sensor responses manifests itself in the principal component analysis (PCA). The excellent sensing performance indicates that the CEN can detect the biomarkers of H2S, NH3, and NO in exhaled breath and even distinguish them clearly in the PCA. Our results show high potential of the CEN as an inexpensive and noninvasive diagnostic tool for halitosis, kidney disorder, and asthma.
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Affiliation(s)
- Hi Gyu Moon
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
- Department of Material Science and Engineering, Yonsei University , Seoul 120-749, Republic of Korea
| | - Youngmo Jung
- Department of Material Science and Engineering, Yonsei University , Seoul 120-749, Republic of Korea
- Department of Mechanical Engineering, Yonsei University , Seoul 120-749, Republic of Korea
| | - Soo Deok Han
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University , Seoul 136-701, Republic of Korea
| | - Young-Seok Shim
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Beomju Shin
- Sensor System Research Center, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Taikjin Lee
- Sensor System Research Center, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Jin-Sang Kim
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Seok Lee
- Sensor System Research Center, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Seong Chan Jun
- Department of Mechanical Engineering, Yonsei University , Seoul 120-749, Republic of Korea
| | - Hyung-Ho Park
- Department of Material Science and Engineering, Yonsei University , Seoul 120-749, Republic of Korea
| | - Chulki Kim
- Sensor System Research Center, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Chong-Yun Kang
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University , Seoul 136-701, Republic of Korea
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36
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Abstract
Cross-point memory architecture (CPMA) by using memristors has attracted considerable attention because of its high-density integration. However, a common and significant drawback of the CPMA is related to crosstalk issues between cells by sneak currents. This study demonstrated the sneak current free resistive switching characteristic of a ferroelectric tunnel diode (FTD) memristor for a CPMA by utilizing a novel concept of a ferroelectric quadrangle and triangle barrier switch. A FTD of Au/BaTiO3 (5 nm)/Nb-doped SrTiO3 (100) was used to obtain a desirable memristive effect for the CPMA. The FTD could reversibly change the shape of the ferroelectric potential from a quadrangle to a triangle. The effect included high nonlinearity and diode characteristics. It was derived from utilizing different sequences of carrier transport mechanisms such as the direct tunneling current, Fowler-Nordheim tunneling, and thermionic emission. The FTD memristor demonstrated the feasibility of sneak current-free high-density CPMA.
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Affiliation(s)
- Hong-Sub Lee
- Department of Materials Science and Engineering, Yonsei University , Seodaemun-Ku, Seoul 120-749, Korea
- Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University , Seodaemun-Ku, Seoul 120-749, Korea
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37
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Lee HS, Kang KM, Yeom GY, Park HH. Evaluation of a ferroelectric tunnel junction by ultraviolet-visible absorption using a removable liquid electrode. Nanotechnology 2016; 27:215704. [PMID: 27087674 DOI: 10.1088/0957-4484/27/21/215704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ferroelectric memristors offer a significant alternative to their redox-based analogs in resistive random access memory because a ferroelectric tunnel junction (FTJ) exhibits a memristive effect that induces resistive switching (RS) regardless of the operating current level. This RS results from a change in the ferroelectric polarization direction, allowing the FTJ to overcome the restriction encountered in redox-based memristors. Herein, the memristive effect of an FTJ was investigated by ultraviolet-visible (UV-Vis) absorption spectroscopy using a removable mercury (Hg) top electrode (TE), BaTiO3 (BTO) ferroelectric tunnel layer, La0.7Sr0.3MnO3 (LSMO) semiconductor bottom electrode, and wide-bandgap quartz (100) single-crystal substrate to determine the low-resistance state (LRS) and high-resistance state (HRS) of the FTJ. A BTO (110)/LSMO (110) polycrystal memristor involving a Hg TE showed a small memristive effect (switching ratio). This effect decreased with increasing read voltage because of a small potential barrier height. The LRS and HRS of the FTJ showed quasi-similar UV-Vis absorption spectra, consistent with the small energy difference between the valence-band maximum of BTO and Fermi level of LSMO near the interface between the LRS and HRS. This energy difference stemmed from the ferroelectric polarization and charge-screening effect of LSMO based on an electrostatic model of the FTJ.
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Affiliation(s)
- Hong-Sub Lee
- Department of Materials Science and Engineering, Yonsei University, Seodaemun-Ku, Seoul 120-749, Korea
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38
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Mahadik D, Jung HNR, Lee YK, Lee KY, Park HH. Elastic and Superhydrophobic Monolithic Methyltrimethoxysilane-based Silica Aerogels by Two-step Sol-gel Process. ACTA ACUST UNITED AC 2016. [DOI: 10.6117/kmeps.2016.23.1.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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39
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Mahadik D, Lee YK, Chavan N, Mahadik S, Park HH. Monolithic and shrinkage-free hydrophobic silica aerogels via new rapid supercritical extraction process. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2015.08.020] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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40
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Park HH, Zhang X, Lee KW, Sohn A, Kim DW, Kim J, Song JW, Choi YS, Lee HK, Jung SH, Lee IG, Cho YD, Shin HB, Sung HK, Park KH, Kang HK, Park WK, Park HH. Selective photochemical synthesis of Ag nanoparticles on position-controlled ZnO nanorods for the enhancement of yellow-green light emission. Nanoscale 2015; 7:20717-20724. [PMID: 26601993 DOI: 10.1039/c5nr05877e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel technique for the selective photochemical synthesis of silver (Ag) nanoparticles (NPs) on ZnO nanorod arrays is established by combining ultraviolet-assisted nanoimprint lithography (UV-NIL) for the definition of growth sites, hydrothermal reaction for the position-controlled growth of ZnO nanorods, and photochemical reduction for the decoration of Ag NPs on the ZnO nanorods. During photochemical reduction, the size distribution and loading of Ag NPs on ZnO nanorods can be tuned by varying the UV-irradiation time. The photochemical reduction is hypothesized to facilitate the adsorbed citrate ions on the surface of ZnO, allowing Ag ions to preferentially form Ag NPs on ZnO nanorods. The ratio of visible emission to ultraviolet (UV) emission for the Ag NP-decorated ZnO nanorod arrays, synthesized for 30 min, is 20.5 times that for the ZnO nanorod arrays without Ag NPs. The enhancement of the visible emission is believed to associate with the surface plasmon (SP) effect of Ag NPs. The Ag NP-decorated ZnO nanorod arrays show significant SP-induced enhancement of yellow-green light emission, which could be useful in optoelectronic applications. The technique developed here requires low processing temperatures (120 °C and lower) and no high-vacuum deposition tools, suitable for applications such as flexible electronics.
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Affiliation(s)
- Hyeong-Ho Park
- Technology Development Division, Korea Advanced Nanofab Center (KANC), Suwon 443270, Korea.
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41
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Hong MH, Park CS, Han W, Yoo B, Park HH. Electrical Properties of Mesoporous TiO2 Nanocomposite Thin Films Incorporated with Au Nanoparticles by Simple One-pot Synthesis. CHEM LETT 2015. [DOI: 10.1246/cl.150658] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Min-Hee Hong
- Department of Materials Science and Engineering, Yonsei University
| | - Chang-Sun Park
- Department of Materials Science and Engineering, Yonsei University
| | - Wooje Han
- Department of Materials Science and Engineering, Yonsei University
| | - Byungwook Yoo
- Flexible Display Research Center, Korea Electronics Technology Institute
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University
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42
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Lee HS, Han W, Chung HY, Rozenberg M, Kim K, Lee Z, Yeom GY, Park HH. Ferroelectric Tunnel Junction for Dense Cross-Point Arrays. ACS Appl Mater Interfaces 2015; 7:22348-22354. [PMID: 26378472 DOI: 10.1021/acsami.5b06117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cross-point array (CPA) structure memories using a memristor are attracting a great deal of attention due to their high density integration with a 4F2 cell. However, a common significant drawback of the CPA configuration is crosstalk between cells. To date, the CPA structure using a redox-based memristor has restrictions to minimize the operating current level due to their resistive switching mechanism. This study demonstrates suitable characteristics of a ferroelectric tunnel junction (FTJ) for the memristor of the CPA structure using an electrostatic model. From the FTJ of the Au/p-type Pr0.98Ca0.02MnO3 (4 nm)/BaTiO3 (4.3 nm)/n-type Ca0.98Pr0.02MnO3 (3 nm)/Pt(111) structure, which has a higher and thicker potential barrier, a good memristive effect for the CPA structure with a high nonlinear current-voltage curve and low current operation, was obtained by Δ Fowler-Nordheim tunneling with effectively blocked direct tunneling and thermionic emission. The FTJ demonstrated reduced sneak current and the possible for high nonlinearity.
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Affiliation(s)
- Hong-Sub Lee
- Department of Materials Science and Engineering, Yonsei University , Seodaemun-Ku, Seoul 120-749, Korea
| | - Wooje Han
- Department of Materials Science and Engineering, Yonsei University , Seodaemun-Ku, Seoul 120-749, Korea
| | - Hee-Yoon Chung
- Department of Materials Science and Engineering, Yonsei University , Seodaemun-Ku, Seoul 120-749, Korea
| | - Marcelo Rozenberg
- Laboratoire de Physique des Solides, CNRS-UMR 8502 Université Paris-Sud , Orsay 91405, France
- IFIBA-Conicet and Departamento de Física, FCEN, Universidad de Buenos Aires, Ciudad Universitaria Pabellón I , (1428) Buenos Aires, Argentina
| | - Kangsik Kim
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea
| | - Zonghoon Lee
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea
| | - Geun Young Yeom
- Department of Advanced Materials Science and Engineering and SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University , Suwon, Kyunggi-do 440-746, Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University , Seodaemun-Ku, Seoul 120-749, Korea
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43
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Affiliation(s)
- WooJe Han
- Department of Materials Science and Engineering; Yonsei University; Seoul 120-749 Republic of Korea
| | - Hong-Sub Lee
- Department of Materials Science and Engineering; Yonsei University; Seoul 120-749 Republic of Korea
| | - Uzma K. H. Bangi
- Department of Materials Science and Engineering; Yonsei University; Seoul 120-749 Republic of Korea
- School of Physical Sciences; Solapur University; Solapur-413255 Maharashtra India
| | - Byungwook Yoo
- Flexible Display Research Center; Korea Electronics Technology Institute; Seongnam Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering; Yonsei University; Seoul 120-749 Republic of Korea
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44
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Lee HS, Park HH. Manganite based hetero-junction structure of La0.7Sr(0.7-x)CaxMnO3 and CaMnO(3-δ) for cross-point arrays. Nanotechnology 2015; 26:275704. [PMID: 26086277 DOI: 10.1088/0957-4484/26/27/275704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Resistive random access memory and the corresponding cross-point array (CPA) structure have received a great deal of attention for high-density next generation non-volatile memory. However, the cross-talk issue of CPA structure by sneak current should be overcome to realize the highest density integration. To accomplish this, the sneak current can be minimized by high, nonlinear characteristic behaviors of resistive switching (RS). Therefore this study fabricated pnp bipolar hetero-junction structure using the perovskite manganite family, such as La0.7Sr(0.3-x)CaxMnO3 (LSCMO) and CaMnO(3-δ) (CMO), to obtain nonlinear RS behavior. The pnp structure not only shows nonlinear characteristics, but also a tunable characteristic with Ca substitution.
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Affiliation(s)
- Hong-Sub Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
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45
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Kim H, Kang KM, Han W, Chang YC, Park HH. In Situ Incorporation of Pt Nanoparticles in Fluorine-doped SnO 2 Nanocomposite Thin Films by a One-step Synthesis. CHEM LETT 2015. [DOI: 10.1246/cl.150092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hyuncheol Kim
- Department of Materials Science and Engineering, Yonsei University
| | - Kyung-Mun Kang
- Department of Materials Science and Engineering, Yonsei University
| | - Wooje Han
- Department of Materials Science and Engineering, Yonsei University
| | - Young Chul Chang
- School of Mechatronics Engineering, Korea University of Technology and Education
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University
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46
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Lee HS, Park HH, Rozenberg MJ. Manganite-based memristive heterojunction with tunable non-linear I-V characteristics. Nanoscale 2015; 7:6444-6450. [PMID: 25794166 DOI: 10.1039/c5nr00861a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A resistive random access memory (ReRAM) based on the memristive effect allows high-density integration through a cross-point array (CPA) structure. However, a significant common drawback of the CPA configuration is the crosstalk between cells. Here, we introduce a solution based on a novel heterojunction stack solely made of members of the perovskite manganite family Pr(1-x)Ca(x)MnO3 (PCMO) and CaMnO(3-δ) (CMO) which show electroforming-free bipolar resistive switching. The heterojunction consists of rectifying interfaces and shows a symmetrical and tunable non-linear current-voltage curve. The spectromicroscopic measurements support the scenario of specialized roles, with the memristive effect taking place at the active Al-PCMO interface via a redox mechanism, while non-linearity was achieved by adopting a rectifying double interface PCMO-CMO-PCMO.
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Affiliation(s)
- Hong-Sub Lee
- Department of Materials Science and Engineering, Yonsei University, Seodaemun-Ku, Seoul 120-749, Korea.
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47
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Kim H, Jo SH, Jee JH, Han W, Kim Y, Park HH, Jin HJ, Yoo B, Lee JK. Fluorous-inorganic hybrid dielectric materials for solution-processed electronic devices. NEW J CHEM 2015. [DOI: 10.1039/c4nj01435a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorous-inorganic hybrid dielectric (FIHD) materials in fluorous solvents can be deposited on top of organic semiconductor films by solution casting.
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Affiliation(s)
- Heejin Kim
- Department of Polymer Science and Engineering
- Inha University
- Incheon 402-751
- South Korea
| | - Sang Ho Jo
- Korea Electronics Technology Institute
- Seongnam-si
- Gyeonggi-do
- South Korea
| | - Joong-Hwi Jee
- Department of Polymer Science and Engineering
- Inha University
- Incheon 402-751
- South Korea
| | - WooJe Han
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- South Korea
| | - Youngtae Kim
- Department of Polymer Science and Engineering
- Inha University
- Incheon 402-751
- South Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- South Korea
| | - Hyoung-Joon Jin
- Department of Polymer Science and Engineering
- Inha University
- Incheon 402-751
- South Korea
| | - Byungwook Yoo
- Korea Electronics Technology Institute
- Seongnam-si
- Gyeonggi-do
- South Korea
| | - Jin-Kyun Lee
- Department of Polymer Science and Engineering
- Inha University
- Incheon 402-751
- South Korea
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48
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Park CS, Mahadik DB, Park HH. Enhancement of the O2 gas sensing properties of mesoporous Sr0.9La0.1TiO3 films by increasing the pore connectivity. RSC Adv 2015. [DOI: 10.1039/c5ra07922e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The structural and gas sensing properties of mesoporous Sr0.9La0.1TiO3 films for oxygen sensing applications were investigated as a function of surfactant concentration.
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Affiliation(s)
- Chang-Sun Park
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - D. B. Mahadik
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
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49
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Kim H, Park CS, Kang KM, Hong MH, Choi YJ, Park HH. The CO gas sensing properties of direct-patternable SnO2 films containing graphene or Ag nanoparticles. NEW J CHEM 2015. [DOI: 10.1039/c4nj01978d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The CO gas sensing properties of direct-patternable SnO2 composite thin films were more effectively improved by the incorporation of Ag nanoparticles than graphene.
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Affiliation(s)
- Hyuncheol Kim
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - Chang-Sun Park
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - Kyung-Mun Kang
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - Min-Hee Hong
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - Yong-June Choi
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749
- Republic of Korea
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50
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Nam WH, Kim BB, Seo SG, Lim YS, Kim JY, Seo WS, Choi WK, Park HH, Lee JY. Structurally nanocrystalline-electrically single crystalline ZnO-reduced graphene oxide composites. Nano Lett 2014; 14:5104-5109. [PMID: 25136740 DOI: 10.1021/nl5018089] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
ZnO, a wide bandgap semiconductor, has attracted much attention due to its multifunctionality, such as transparent conducting oxide, light-emitting diode, photocatalyst, and so on. To improve its performances in the versatile applications, numerous hybrid strategies of ZnO with graphene have been attempted, and various synergistic effects have been achieved in the ZnO-graphene hybrid nanostructures. Here we report extraordinary charge transport behavior in Al-doped ZnO (AZO)-reduced graphene oxide (RGO) nanocomposites. Although the most challenging issue in semiconductor nanocomposites is their low mobilities, the AZO-RGO nanocomposites exhibit single crystal-like Hall mobility despite the large quantity of nanograin boundaries, which hinder the electron transport by the scattering with trapped charges. Because of the significantly weakened grain boundary barrier and the proper band alignment between the AZO and RGO, freely conducting electrons across the nanograin boundaries can be realized in the nanocomposites. This discovery of the structurally nanocrystalline-electrically single crystalline composite demonstrates a new route for enhancing the electrical properties in nanocomposites based on the hybrid strategy.
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Affiliation(s)
- Woo Hyun Nam
- Department of Materials Science and Engineering, KAIST , Daejeon 305-701, Korea
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