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Mehmood Z, Shah SAA, Omer S, Idrees R, Saeed S. Scalable synthesis of high-quality, reduced graphene oxide with a large C/O ratio and its dispersion in a chemically modified polyimide matrix for electromagnetic interference shielding applications. RSC Adv 2024; 14:7641-7654. [PMID: 38440276 PMCID: PMC10910857 DOI: 10.1039/d4ra00329b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 02/23/2024] [Indexed: 03/06/2024] Open
Abstract
High-purity reduced graphene oxide (RGO or rGO) with appreciable conductivity is a desired conductive filler for lightweight polymer composites used in coatings, electronics, catalysts, electromagnetic interference (EMI) shielding, and energy storage devices. However, the intrinsic conductivity and the uniform dispersion of RGO in relatively polar matrices are challenging, leading to poor overall conductivity and performance of the composite material. The reported study improved the RGO intrinsic conductivity by increasing its C/O ratio while also simultaneously enhancing its compatibility with the polyimide (PI) matrix through ester linkages for better dispersion. A two-step reduction method drastically increased the number of structural defects and carbon content in the resulting RGO, corresponding to a maximum ID/IG and C/O of 1.54 and ∼87, respectively. Moreover, the 2D nanosheets with limited hydroxyl (-OH) groups effectively interacted with anhydride-terminated polyamic acid (AT-PAA) through chemical linkages to make high-performance RGO/PI nanocomposites. Consequently, the polymer matrix composites possessed the highest direct current conductivity of 15.27 ± 0.61 S cm-1 for 20 wt% of the prepared RGO. Additionally, the composite material was highly stiff (3.945 GPa) yet flexible (easily bent through 180°), lightweight (∼0.34 g cm-3), and capable of forming thin films (162 ± 15 μm). Unlike most polymer matrix composites, it showcased one of its class's highest thermal stabilities (a weight loss of only 5% at 638 °C). Ultimately, the composite performed as an effective electromagnetic interference (EMI) shielding material in the X-Band (8 to 12 GHz), demonstrating outstanding shielding effectiveness (SE), shielding effectiveness per unit thickness (SEt), specific shielding effectiveness (SSE), and absolute shielding effectiveness (SSEt) of 46 dB, 2778 dB cm-2, 138 dB cm3 g-1, and 8358 dB cm2 g-1, respectively. As a consequence of this research, the high-purity RGO and its high-performance PI matrix nanocomposites are anticipated to find practical applications in conductive coatings and flexible substrates demanding high-temperature stability.
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Affiliation(s)
- Zahid Mehmood
- Department of Chemistry, Pakistan Institute of Engineering and Applied Sciences (PIEAS) Islamabad-45650 Pakistan
| | - Syed Aizaz Ali Shah
- Department of Chemistry, Pakistan Institute of Engineering and Applied Sciences (PIEAS) Islamabad-45650 Pakistan
| | - Saeed Omer
- Department of Chemistry, Pakistan Institute of Engineering and Applied Sciences (PIEAS) Islamabad-45650 Pakistan
| | - Ramsha Idrees
- Department of Chemistry, Pakistan Institute of Engineering and Applied Sciences (PIEAS) Islamabad-45650 Pakistan
| | - Shaukat Saeed
- Department of Chemistry, Pakistan Institute of Engineering and Applied Sciences (PIEAS) Islamabad-45650 Pakistan
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2
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The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227840. [PMID: 36431940 PMCID: PMC9696217 DOI: 10.3390/molecules27227840] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 10/26/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022]
Abstract
The chemical reduction efficiencies of graphene oxide (GO) are critically important in achieving graphene-like properties in reduced graphene oxide (rGO). In this study, we assessed GO lateral size and its degree of oxidation effect on its chemical reduction efficiency in both suspension and film and the electrical conductivity of the corresponding rGO films. We show that while GO-reduction efficiency increases with the GO size of lower oxidation in suspension, the trend is opposite for film. FESEM, XRD, and Raman analyses reveal that the GO reduction efficiency in film is affected not only by GO size and degree of oxidation but also by its interlayer spacing (restacking) and the efficiency is tunable based on the use of mixed GO. Moreover, we show that the electrical conductivity of rGO films depends linearly on the C/O and Raman ID/IG ratio of rGO and not the lateral size of GO. In this study, an optimal chemical reduction was achieved using premixed large and small GO (L/SGO) at a ratio of 3:1 (w/w). Consequently, the highest electrical conductivity of 85,283 S/m was achieved out of all rGO films reported so far. We hope that our findings may help to pave the way for a simple and scalable method to fabricate tunable, electrically conductive rGO films for electronic applications.
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3
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Tsuchida T, Fukushima J, Tobise M, Hayashi Y, Takizawa H. Low-temperature hydrogen reduction of iron oxide by controlling the water potential using a CaH2 drying agent. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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4
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Liu W, Speranza G. Tuning the Oxygen Content of Reduced Graphene Oxide and Effects on Its Properties. ACS OMEGA 2021; 6:6195-6205. [PMID: 33718710 PMCID: PMC7948250 DOI: 10.1021/acsomega.0c05578] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 02/05/2021] [Indexed: 05/24/2023]
Abstract
The need to recover the graphene properties in terms of electrical and thermal conductivity calls for the application of reduction processes leading to the removal of oxygen atoms from the graphene oxide sheet surface. The recombination of carbon-carbon double bonds causes a partial recovery of the original graphene properties mainly limited by the presence of residual oxygen atoms and lattice defects. However, the loss of polar oxygen-based functional groups renders the material dispersibility rather complicated. In addition, oxygen-containing functional groups are reaction sites useful to further bind active molecules to engineer the reduced graphene sheets. For these reasons, a variety of chemical processes are described in the literature to reduce the graphene oxide. However, it is greatly important to select a chemical process enabling a thin modulation of the residual oxygen content thus tuning the properties of the final product. In this work, we will present a chemical-processing technique based on the hydroiodic acid to carefully control the degree of residual oxidation. Graphene oxides were reduced using hydroiodic acid with concentrations from 0.06 to 0.95 mol L-1. Their properties were characterized in detail and tested, and the results showed that their oxygen content was finely tuned from 33.6 to 10.7 atom %. This allows carefully tailoring the material properties with respect to the desired application, which is exemplified by the variation of the bulk resistance from 92 Ω to 14.8 MΩ of the film from the obtained rGO.
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Affiliation(s)
- Wei Liu
- Fondazione
Bruno Kessler, Via Sommarive 18, Trento 38123, Italy
| | - Giorgio Speranza
- Fondazione
Bruno Kessler, Via Sommarive 18, Trento 38123, Italy
- Department
of Industrial Engineering, University of
Trento, Via Sommarive
9, Trento 38123, Italy
- Istituto
di Fotonica e Nanotecnologie, IFN-CNR, Via Alla Cascata 56/C, Trento 38123, Italy
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5
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rGO Functionalized ZnO–TiO2 Core-Shell Flower-Like Architectures for Visible Light Photocatalysis. Catalysts 2021. [DOI: 10.3390/catal11030332] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Core-shell heterostructures with a complex, flower-like morphology, comprising a ZnO core and a TiO2 shell decorated with reduced graphene oxide (rGO) sheets by hydrothermal wrapping, are reported to extend the absorption properties of the semiconductors toward the visible light range. The ternary photocatalysts were characterized by X-ray diffraction, field emission scanning electron microscopy, Raman spectroscopy, diffuse reflectance UV–Vis, and attenuated total reflectance-Fourier transform infrared spectroscopy. Its photocatalytic performance was evaluated under visible light irradiation using methylene blue dye as a model pollutant. The rGO-modified ZnO–TiO2 photocatalyst exhibited superior photoactivity compared to that of the parent ZnO–TiO2 core-shell structures, which was dependent on its graphene content. The enhanced photocatalytic response was attributed to the higher absorption in the visible light range, as well as the pronounced electron and hole separation in the ternary system.
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6
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Tseng CA, Sahoo PK, Lee CP, Lin YT, Xu JH, Chen YT. Synthesis of CoO-Decorated Graphene Hollow Nanoballs for High-Performance Flexible Supercapacitors. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40426-40432. [PMID: 32790275 DOI: 10.1021/acsami.0c12898] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The formation of thin and uniform capacitive layers for fully interacting with an electrolyte in a supercapacitor is a key challenge to achieve optimal capacitance. Here, we demonstrate a binder-free and flexible supercapacitor with the electrode made of cobalt oxide nanoparticle (CoO NP)-wrapped graphene hollow nanoballs (GHBs). The growth process of Co(OH)2 NPs, which could subsequently be thermally annealed to CoO NPs, was monitored by in situ electrochemical liquid transmission electron microscopy (TEM). In the dynamic growth of Co(OH)2 NPs on a film of GHBs, the lateral formation of fan-shaped clusters of Co(OH)2 NPs spread over the surface of GHBs was observed by in situ TEM. This CoO-GHBs/CC electrode exhibits high specific capacitance (2238 F g-1 at 1 A g-1) and good rate capability (1170 F g-1 at 15 A g-1). The outstanding capacitive performance and good rate capability of the CoO-GHBs/CC electrode were achieved by the synergistic combination of highly pseudocapacitive CoO and electrically conductive GHBs with large surface areas. A solid-state symmetric supercapacitor (SSC), with CoO-GHBs/CCs used for both positive and negative electrodes, exhibits high power density (6000 W kg-1 at 8.2 Wh kg-1), high energy density (16 Wh kg-1 at 800 W kg-1), cycling stability (∼100% capacitance retention after 5000 cycles), and excellent mechanical flexibility at various bending positions. Finally, a serial connection of four SSC devices can efficiently power a red light-emitting diode after being charged for 20 s, demonstrating the practical application of this CoO-GHBs/CC-based SSC device for efficient energy storage.
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Affiliation(s)
- Chi-Ang Tseng
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Prasanta Kumar Sahoo
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Chuan-Pei Lee
- Department of Applied Physics and Chemistry, University of Taipei, Taipei 10048, Taiwan
| | - Yu-Ting Lin
- Department of Applied Physics and Chemistry, University of Taipei, Taipei 10048, Taiwan
| | - Jing-Han Xu
- Department of Applied Physics and Chemistry, University of Taipei, Taipei 10048, Taiwan
| | - Yit-Tsong Chen
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
- Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 10617, Taiwan
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7
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Wu L, Jiang X. Enhancing Peroxidase Activity of Cytochrome c by Modulating Interfacial Interaction Forces with Graphene Oxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1094-1102. [PMID: 31951423 DOI: 10.1021/acs.langmuir.9b03151] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Graphene oxide (GO) has drawn worldwide attention in various biomedical fields because of its unique properties, and great progress has been made in the past years. Probing the interaction between GO and proteins, understanding and evaluating potential impact of GO on the protein structure and function, is of significant importance for design and optimization of functional interfaces and revealing the bioeffect of GO materials. Cytochrome c (cyt c), one of the key components of respiratory chain, has played important roles in energy generation/consumption and many cellular processes including growth, proliferation, differentiation, and apoptosis. In this study, by combination of solution chemistry and spectroscopy, we systematically studied the interfacial interaction between GO and cyt c. Results suggest that GO could slightly perturb the active site of cyt c, enhancing its peroxidase activity. Structure of the active site is obviously changed with elapsed time, which in turn reduces peroxidase activity. Further study suggests that adsorption of cyt c on GO and the resulted structure change is a complex process resulting from the cooperation of various interaction forces. Hydrophobic interaction and π-π stacking, as well as electrostatic attraction, only slightly perturb the microenvironment of the active site of cyt c while hydrogen-bonding interaction is the main driving force for the structural change of the active site. Furthermore, long range electrostatic attraction between GO and cyt c may facilitate the short range hydrogen-bonding interaction, which intensifies the hydrogen-bonding-induced structural change. In addition, cyt c is partially reduced by GO in an alkaline environment. Based on the understanding of interfacial interaction mechanism between GO and cyt c, stable nanocomposites with enhanced peroxidase activity are successfully constructed by modulating the interfacial interaction forces. This work not only deepens the understanding of interaction between GO and functional protein, but also is of great importance for designing and applying of GO-based biomaterials.
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Affiliation(s)
- Lie Wu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , Jilin , China
| | - Xiue Jiang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , Jilin , China
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8
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Electrochemical formation of graphite oxide from the mixture composed of sulfuric and nitric acids. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.088] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Tiwari SK, Nimbalkar AS, Hong CK, Ha SK. A Green Route for Quick and Kilogram Production of Reduced Graphene Oxide and Their Applications at Low Loadings in Epoxy Resins. ChemistrySelect 2019. [DOI: 10.1002/slct.201803792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Santosh K. Tiwari
- Hanyang Structure & Composite lab, Department of Mechanical Engineering; Hanyang University; Seoul South Korea
| | - Ajaysing S. Nimbalkar
- Polymer Energy Materials Laboratory, Department of Advanced Chemical Engineering; Chonnam National University; Gwangju South Korea
| | - Chang Kook Hong
- Polymer Energy Materials Laboratory, Department of Advanced Chemical Engineering; Chonnam National University; Gwangju South Korea
| | - Sung Kyu Ha
- Hanyang Structure & Composite lab, Department of Mechanical Engineering; Hanyang University; Seoul South Korea
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10
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Reduced Graphene Oxide/CZTSxSe1‐xComposites as a Novel Hole‐Transport Functional Layer in Perovskite Solar Cells. ChemElectroChem 2019. [DOI: 10.1002/celc.201801459] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Jayalakshmi G, Saravanan K, Panigrahi BK, Sundaravel B, Gupta M. Tunable electronic, electrical and optical properties of graphene oxide sheets by ion irradiation. NANOTECHNOLOGY 2018; 29:185701. [PMID: 29451500 DOI: 10.1088/1361-6528/aab011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The tunable electronic, electrical and optical properties of graphene oxide (GO) sheets were investigated using a controlled reduction by 500 keV Ar+-ion irradiation. The carbon to oxygen ratio of the GO sheets upon the ion beam reduction has been estimated using resonant Rutherford backscattering spectrometry analyses and its effect on the electrical and optical properties of GO sheets has been studied using sheet resistance measurements and photoluminescence (PL) measurements. The restoration of sp 2-hybridized carbon atoms within the sp 3 matrix is found to be increases with increasing the Ar+-ion fluences as evident from Fourier transform infrared, and x-ray absorption near-edge structure measurements. The decrease in the number of disorder-induced local density of states (LDOSs) within the π-π* gap upon the reduction causes the shifting of PL emission from near infra-red to blue region and decreases the sheet resistance. The improved electrical and optical properties of GO sheets were correlated to the decrease in the number of LDOSs within the π-π* gap. Our experimental investigations suggest ion beam irradiation is one of an effective approaches to reduce GO to RGO and to tailor its electronic, electrical and optical properties.
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Affiliation(s)
- G Jayalakshmi
- Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, Tamilnadu, India
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12
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You X, Yang S, Li J, Deng Y, Dai L, Peng X, Huang H, Sun J, Wang G, He P, Ding G, Xie X. Green and Mild Oxidation: An Efficient Strategy toward Water-Dispersible Graphene. ACS APPLIED MATERIALS & INTERFACES 2017; 9:2856-2866. [PMID: 28029764 DOI: 10.1021/acsami.6b13703] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Scalable fabrication of water-dispersible graphene (W-Gr) is highly desirable yet technically challenging for most practical applications of graphene. Herein, a green and mild oxidation strategy to prepare bulk W-Gr (dispersion, slurry, and powder) with high yield was proposed by fully exploiting structure defects of thermally reduced graphene oxide (TRGO) and oxidizing radicals generated from hydrogen peroxide (H2O2). Owing to the increased carboxyl group from the mild oxidation process, the obtained W-Gr can be redispersed in low-boiling solvents with a reasonable concentration. Benefiting from the modified surface chemistry, macroscopic samples processed from the W-Gr show good hydrophilicity (water contact angle of 55.7°) and excellent biocompatibility, which is expected to be an alternative biomaterial for bone, vessel, and skin regeneration. In addition, the green and mild oxidation strategy is also proven to be effective for dispersing other carbon nanomaterials in a water system.
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Affiliation(s)
- Xiaofei You
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Siwei Yang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Jipeng Li
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine , Shanghai 200011, People's Republic of China
| | - Yuan Deng
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine , Shanghai 200011, People's Republic of China
| | - Lianqi Dai
- Zhejiang CHINT Cable Company, Ltd. , Zhejiang 314006, People's Republic of China
| | - Xiong Peng
- Zhejiang CHINT Cable Company, Ltd. , Zhejiang 314006, People's Republic of China
| | - Haoguang Huang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Jing Sun
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
| | - Gang Wang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
| | - Peng He
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Guqiao Ding
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Xiaoming Xie
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
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13
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Ramalingam K, Panchu S, Salunke AS, Muthukumar K, Ramanujam A, Muthiah S. Free-Standing Graphene/Conducting Polymer Hybrid Cathodes as FTO and Pt-Free Electrode for Quasi-State Dye Sensitized Solar Cells. ChemistrySelect 2016. [DOI: 10.1002/slct.201600874] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Karthick Ramalingam
- CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
- CSIR-Network of Institutes for Solar Energy; CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
- CSIR-Academy of Scientific & Innovative Research, CSIR Campus; Taramani, Chennai - 600113 Tamil Nadu India
| | - SarojiniJeeva Panchu
- CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
- CSIR-Network of Institutes for Solar Energy; CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
| | - Ashish Shivaji Salunke
- CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
| | - Kamalambika Muthukumar
- CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
| | - Ashwin Ramanujam
- CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
| | - Selvaraj Muthiah
- CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
- CSIR-Network of Institutes for Solar Energy; CSIR-Central Electrochemical Research Institute, Karaikudi; Tamil Nadu India. Pin - 630003
- CSIR-Academy of Scientific & Innovative Research, CSIR Campus; Taramani, Chennai - 600113 Tamil Nadu India
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14
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Yang Y, Li M, Wu Y, Wang T, Choo ESG, Ding J, Zong B, Yang Z, Xue J. Nanoscaled self-alignment of Fe3O4 nanodiscs in ultrathin rGO films with engineered conductivity for electromagnetic interference shielding. NANOSCALE 2016; 8:15989-15998. [PMID: 27540698 DOI: 10.1039/c6nr04539a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Ultrathin (∼2 μm) reduced graphene oxide (rGO) film embedded with self-aligned Fe3O4 nanodiscs were successfully fabricated through the filtration-assisted self-assembly method. In the as-fabricated hybrid film, Fe3O4 nanodiscs with thin thickness (26 nm) and high aspect ratio (∼9) were readily self-assembled and aligned in rGO intersheets under the assistance of hydrostatic forces. Compared with spherical Fe3O4 nanoparticles, introducing the Fe3O4 nanodiscs into rGO paper could not only offer high magnetic permeability and magnetic loss in a broad frequency range at the gigahertz level, but also increase the electrical conductivity of rGO film by means of improving the surface roughness without disrupting the conductive network of the rGO layers. Due to the above advantages, the free-standing rGO/Fe3O4 nanodisc magnetic hybrid film (56 wt%) exhibited an EMI shielding effectiveness (SE) of around 11.2 dB in the frequency range of 2-10 GHz, which is about 50% and 72% higher than that of neat rGO film and rGO/Fe3O4 nanosphere hybrid films (with similar particle size and loading weight fraction) prepared under the same conditions, respectively. Furthermore, compared with non-magnetic neat rGO film, the outstanding magnetic properties of the rGO/Fe3O4 nanodisc film paves the way for it to be used as a multifunctional material that can be controlled by magnetic fields. Additionally, the moderate thermal reduction temperature (420 °C) would be meaningful for large scale fabrication. Meanwhile, the strategy of achieving good alignment at the nanoscale could shed light on developing heterogeneous structures with self-aligned two-dimensional (2D) (magnetic or non-magnetic) nano-inclusions for various applications.
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Affiliation(s)
- Yong Yang
- Temasek Laboratories, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore
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15
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Burman D, Ghosh R, Santra S, Guha PK. Highly proton conducting MoS2/graphene oxide nanocomposite based chemoresistive humidity sensor. RSC Adv 2016. [DOI: 10.1039/c6ra11961a] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper reports the development of MoS2/GO nanocomposite based sensing layers for resistive humidity sensors.
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Affiliation(s)
- Debasree Burman
- Department of Electronics & Electrical Communication Engineering
- Indian Institute of Technology
- Kharagpur
- India
| | - Ruma Ghosh
- Department of Electronics & Electrical Communication Engineering
- Indian Institute of Technology
- Kharagpur
- India
| | - Sumita Santra
- Department of Physics
- Indian Institute of Technology
- Kharagpur
- India
| | - Prasanta K. Guha
- Department of Electronics & Electrical Communication Engineering
- Indian Institute of Technology
- Kharagpur
- India
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16
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Shin HS, Kim KW, Kang YG, Myung S, Kim JS, An KS, Lee IY, Lee SS. New approach for the reduction of graphene oxide with triphenylphosphine dihalide. RSC Adv 2016. [DOI: 10.1039/c5ra26046a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We developed a one-flask method for the thermal reduction of graphene oxide (GO) with triphenylphosphine dihalide (Ph3PX2) at 180 °C.
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Affiliation(s)
- Hong-Suk Shin
- Eco-Friendly New Materials Research Center
- Korea Research Institute of Chemical Technology
- Daejeon
- Republic of Korea
- Department of Chemistry
| | - Ki Woong Kim
- Thin Film Materials Research Center Korea Research Institute of Chemical Technology
- Daejeon
- Republic of Korea
| | - Yong-goo Kang
- Department of Chemistry
- Korea University
- Seoul
- Republic of Korea
| | - Sung Myung
- Thin Film Materials Research Center Korea Research Institute of Chemical Technology
- Daejeon
- Republic of Korea
| | - Jong Seung Kim
- Department of Chemistry
- Korea University
- Seoul
- Republic of Korea
| | - Ki-Seok An
- Thin Film Materials Research Center Korea Research Institute of Chemical Technology
- Daejeon
- Republic of Korea
| | - Ill Young Lee
- Eco-Friendly New Materials Research Center
- Korea Research Institute of Chemical Technology
- Daejeon
- Republic of Korea
| | - Sun Sook Lee
- Thin Film Materials Research Center Korea Research Institute of Chemical Technology
- Daejeon
- Republic of Korea
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17
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Kumar R, Naqvi S, Gupta N, Gaurav K, Khan S, Kumar P, Rana A, Singh RK, Bharadwaj R, Chand S. Bulk synthesis of highly conducting graphene oxide with long range ordering. RSC Adv 2015. [DOI: 10.1039/c5ra01943e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A two step mild oxidation process instead of extensive oxidation of graphite based on Hummers' method (H-GO) preserves the honeycomb graphene sheet structures in the range of 51 Å without reduction of mGO.
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Affiliation(s)
- Rachana Kumar
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Samya Naqvi
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Neha Gupta
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Kumar Gaurav
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Saba Khan
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Pramod Kumar
- Magnetic and Spintronic Laboratory
- Indian Institute of Information Technology Allahabad
- India
| | - Aniket Rana
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Rajiv K. Singh
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Ramil Bharadwaj
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| | - Suresh Chand
- Physics of Energy Harvesting Division
- National Physical Laboratory
- New Delhi
- India
| |
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