1
|
Giant defect emission enhancement from ZnO nanowires through desulfurization process. Sci Rep 2020; 10:4237. [PMID: 32144312 PMCID: PMC7060210 DOI: 10.1038/s41598-020-61189-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 02/07/2020] [Indexed: 11/26/2022] Open
Abstract
Zinc oxide (ZnO) is a stable, direct bandgap semiconductor emitting in the UV with a multitude of technical applications. It is well known that ZnO emission can be shifted into the green for visible light applications through the introduction of defects. However, generating consistent and efficient green emission through this process is challenging, particularly given that the chemical or atomic origin of the green emission in ZnO is still under debate. In this work we present a new method, for which we coin term desulfurization, for creating green emitting ZnO with significantly enhanced quantum efficiency. Solution grown ZnO nanowires are partially converted to ZnS, then desulfurized back to ZnO, resulting in a highly controlled concentration of oxygen defects as determined by X-ray photoelectron spectroscopy and electron paramagnetic resonance. Using this controlled placement of oxygen vacancies we observe a greater than 40-fold enhancement of integrated emission intensity and explore the nature of this enhancement through low temperature photoluminescence experiments.
Collapse
|
2
|
Su Y, Zhao Z, Li S, Liu F, Zhang Z. Rational design of a novel quaternary ZnO@ZnS/Ag@Ag2S nanojunction system for enhanced photocatalytic H2 production. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00828k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel ZnO@ZnS/Ag@Ag2S quaternary nanojunction photocatalyst has been designed for efficient solar water splitting.
Collapse
Affiliation(s)
- Yiping Su
- School of Environmental Science and Engineering
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Zhicheng Zhao
- School of Environmental Science and Engineering
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Shun Li
- School of Environmental Science and Engineering
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Fei Liu
- School of Environmental Science and Engineering
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control
- Southern University of Science and Technology
- Shenzhen 518055
- China
| | - Zuotai Zhang
- School of Environmental Science and Engineering
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control
- Southern University of Science and Technology
- Shenzhen 518055
- China
| |
Collapse
|
3
|
Devaraji P, Mapa M, Abdul Hakkeem HM, Sudhakar V, Krishnamoorthy K, Gopinath CS. ZnO-ZnS Heterojunctions: A Potential Candidate for Optoelectronics Applications and Mineralization of Endocrine Disruptors in Direct Sunlight. ACS OMEGA 2017; 2:6768-6781. [PMID: 30023532 PMCID: PMC6044505 DOI: 10.1021/acsomega.7b01172] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Accepted: 09/28/2017] [Indexed: 06/08/2023]
Abstract
Simple solution combustion synthesis was adopted to synthesize ZnO-ZnS (ZSx) nanocomposites using zinc nitrate as an oxidant and a mixture of urea and thiourea as a fuel. A large thiourea/urea ratio leads to more ZnS in ZSx with heterojunctions between ZnS and ZnO and throughout the bulk; tunable ZnS crystallite size and textural properties are an added advantage. The amount of ZnS in ZSx can be varied by simply changing the thiourea content. Although ZnO and ZnS are wide band gap semiconductors, ZSx exhibits visible light absorption, at least up to 525 nm. This demonstrates an effective reduction of the optical band gap and substantial changes in its electronic structure. Raman spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and secondary-ion mass spectrometry results show features due to ZnO and ZnS and confirm the composite nature with heterojunctions. The above mentioned observations demonstrate the multifunctional nature of ZSx. Bare ZSx exhibits a promising sunlight-driven photocatalytic activity for complete mineralization of endocrine disruptors such as 2,4-dichlorophenol and endosulphan. ZSx also exhibits photocurrent generation at no applied bias. Dye-sensitized solar cell performance evaluation with ZSx shows up to 4% efficiency and 48% incident photon conversion efficiency. Heterojunctions observed between ZnO and ZnS nanocrystallites in high-resolution transmission electron microscopy suggest the reason for effective separation of electron-hole pairs and their utilization.
Collapse
Affiliation(s)
- Perumal Devaraji
- Catalysis
Division, National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India
| | - Maitri Mapa
- Catalysis
Division, National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India
| | - Hasna M. Abdul Hakkeem
- Catalysis
Division, National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India
| | - Vediappan Sudhakar
- Polymer Science and Engineering
Division, Network of Institutes for Solar Energy
(NISE), and Center of Excellence on Surface
Science, National Chemical Laboratory, Pune 411 008, India
| | - Kothandam Krishnamoorthy
- Polymer Science and Engineering
Division, Network of Institutes for Solar Energy
(NISE), and Center of Excellence on Surface
Science, National Chemical Laboratory, Pune 411 008, India
| | - Chinnakonda S. Gopinath
- Catalysis
Division, National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India
- Polymer Science and Engineering
Division, Network of Institutes for Solar Energy
(NISE), and Center of Excellence on Surface
Science, National Chemical Laboratory, Pune 411 008, India
| |
Collapse
|
4
|
Wang Z, Gan L, He H, Ye Z. Free-Standing Atomically Thin ZnO Layers via Oxidation of Zinc Chalcogenide Nanosheets. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13537-13543. [PMID: 28358478 DOI: 10.1021/acsami.7b02425] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Monolayer ZnO represents a class of new two-dimensional (2D) materials that are expected to exhibit unique optoelectronic properties and applications. Here we report a novel strategy to synthesize free-standing atomically thin ZnO layers via the oxidation of hydrothermally grown ultrathin zinc chalcogenide nanosheets. With micrometer-scaled lateral size, the obtained ultrathin ZnO layer has a thickness of ∼2 nm, and the layered structure still maintained well after high temperature oxidation. The thermal treatment strongly improves the crystal quality as well without inducing cracks or pinholes in the ultrathin layers. The atomically thin ZnO layers are highly luminescent with dominant green emission. High quality white light is obtained from the mixed phosphors containing the ZnO layers, exhibiting their potential as compelling ultraviolet-excited phosphors.
Collapse
Affiliation(s)
- Zheng Wang
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, P. R. China
| | - Lu Gan
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, P. R. China
| | - Haiping He
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, P. R. China
| | - Zhizhen Ye
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, P. R. China
| |
Collapse
|
5
|
Ambade SB, Ambade RB, Bagde SS, Eom SH, Mane RS, Shin WS, Lee SH. Low-Temperature Solution-Processed Thiophene-Sulfur-Doped Planar ZnO Nanorods as Electron-Transporting Layers for Enhanced Performance of Organic Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:3831-3841. [PMID: 28029030 DOI: 10.1021/acsami.6b10843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
1-D ZnO represents a fascinating class of nanostructures that are significant to optoelectronics. In this work, we investigated the use of an eco-friendly, metal free in situ doping through a pure thiophene-sulfur (S) on low temperature processed (<95 °C) and annealed (<170 °C), planar 1-D ZnO nanorods (ZnRs) spin-coated as a hole-blocking and electron transporting layer (ETL) for inverted organic solar cells (iOSCs). The TEM, HRTEM, XPS, FT-IR, EDS and Raman studies clearly reveal that the thiophene-S (Thi-S) atom is incorporated on planar ZnRs. The investigations in electrical properties suggest the enhancement in conductivity after Thi-S doping on 1-D ZnRs. The iOSCs of poly(3-hexylthiophene-2,5-diyl) and phenyl-C61-butyric acid methyl ester (P3HT: PC60BM) photoactive layer containing thiophene-S doped planar ZnRs (Thi-S-PZnRs) as ETL exhibits power conversion efficiency (PCE) of 3.68% under simulated AM 1.5 G, 100 mW cm-2 illumination. The ∼47% enhancement in PCE compared with pristine planar ZnRs (PCE = 2.38%) ETL is attributed to a combination of desirable energy level alignment, morphological modification, increased conductivity and doping effect. The universality of Thi-S-PZnRs ETL is demonstrated by the highest PCE of 8.15% in contrast to 6.50% exhibited by the iOSCs of ZnRs ETL for the photoactive layer comprising of poly[4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)benzo[1,2-b;4,5-b]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]: phenyl-C71-butyric acid methyl ester (PTB7-Th: PCB71M). This enhancement in PCE is observed to be driven mainly through improved photovoltaic parameters like fill factor (ff) as well as photocurrent density (Jsc), which are assigned to increased conductivity, exciton dissociation, and effective charge extraction, while; better ohmic contact, reduced charge recombination, and low leakage current density resulted in increased Voc.
Collapse
Affiliation(s)
- Swapnil B Ambade
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 567 Baekje-daero, Jeonju, 54896, Republic of Korea
| | - Rohan B Ambade
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 567 Baekje-daero, Jeonju, 54896, Republic of Korea
| | - Sushil S Bagde
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 567 Baekje-daero, Jeonju, 54896, Republic of Korea
| | - Seung Hun Eom
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 567 Baekje-daero, Jeonju, 54896, Republic of Korea
- Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Rajaram S Mane
- Centre for Nanomaterials & Energy Devices, School of Physical Sciences, SRTM, University , 431606, Nanded, India
| | - Won Suk Shin
- Energy Materials Research Centre, Korea Research Institute of Chemical Technology , Daejeon, Korea
| | - Soo-Hyoung Lee
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 567 Baekje-daero, Jeonju, 54896, Republic of Korea
| |
Collapse
|
6
|
Gangwar J, Gupta BK, Kumar P, Tripathi SK, Srivastava AK. Time-resolved and photoluminescence spectroscopy of θ-Al₂O₃ nanowires for promising fast optical sensor applications. Dalton Trans 2015; 43:17034-43. [PMID: 25300301 DOI: 10.1039/c4dt01831a] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Herein, we have demonstrated the high yield facile growth of Al2O3 nanowires of uniform morphology with different polymorph phases (e.g. γ, δ and θ) via a hydrothermal method with varying calcination temperatures. The synthesized θ-Al2O3 nanowires were well characterized by XRD, FTIR, SEM/EDAX, AFM and HRTEM techniques. Microstructural analysis confirmed that the dimensions of the individual θ-Al2O3 nanowires are approximately in the ranges 5-20 nm in width and 40-150 nm in length, and the aspect ratio is up to 20. AFM results evidenced the uniform distribution of the nanowires with controlled morphology. Furthermore, UV-vis spectroscopic data reveal that the estimated optical band gap of the θ-Al2O3 nanowires was ~5.16 eV. The photoluminescence spectrum exhibits blue emission upon excitation at a wavelength of 252 nm. Time-resolved spectroscopy demonstrates that these nanowires illustrate a decay time of ~2.23 nanoseconds. The obtained photoluminescence results with a decay time of nanoseconds suggest that the θ-Al2O3 phase could be an exceptional choice for next generation fast optical sensors.
Collapse
Affiliation(s)
- Jitendra Gangwar
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S. Krishnan Road, New Delhi, 110012, India
| | | | | | | | | |
Collapse
|
7
|
De los Reyes GB, Dasog M, Na M, Titova LV, Veinot JGC, Hegmann FA. Charge transfer state emission dynamics in blue-emitting functionalized silicon nanocrystals. Phys Chem Chem Phys 2015; 17:30125-33. [DOI: 10.1039/c5cp04819b] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Time-resolved photoluminescence spectroscopy reveals a charge transfer state dynamics responsible for the size-independent blue emission observed from dodecylamine and ammonia functionalized silicon nanocrystals.
Collapse
Affiliation(s)
- Glenda B. De los Reyes
- Department of Physics
- University of Alberta
- Edmonton
- Canada
- Department of Mathematics and Physics
| | - Mita Dasog
- Department of Chemistry
- University of Alberta
- Edmonton
- Canada
- Department of Chemistry and Chemical Engineering
| | - MengXing Na
- Department of Physics
- University of Alberta
- Edmonton
- Canada
| | - Lyubov V. Titova
- Department of Physics
- University of Alberta
- Edmonton
- Canada
- Department of Physics
| | | | | |
Collapse
|
8
|
Kavitha MK, Jinesh KB, Philip R, Gopinath P, John H. Defect engineering in ZnO nanocones for visible photoconductivity and nonlinear absorption. Phys Chem Chem Phys 2014; 16:25093-100. [DOI: 10.1039/c4cp03847a] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
9
|
Cho J, Salleh N, Blanco C, Yang S, Lee CJ, Kim YW, Kim J, Liu J. Novel synthetic methodology for controlling the orientation of zinc oxide nanowires grown on silicon oxide substrates. NANOSCALE 2014; 6:3861-3867. [PMID: 24584438 DOI: 10.1039/c3nr03694d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This study presents a simple method to reproducibly obtain well-aligned vertical ZnO nanowire arrays on silicon oxide (SiOx) substrates using seed crystals made from a mixture of ammonium hydroxide (NH4OH) and zinc acetate (Zn(O2CCH3)2) solution. In comparison, high levels of OH(-) concentration obtained using NaOH or KOH solutions lead to incorporation of Na or K atoms into the seed crystals, destroying the c-axis alignment of the seeds and resulting in the growth of misaligned nanowires. The use of NH4OH eliminates the metallic impurities and ensures aligned nanowire growth in a wide range of OH(-) concentrations in the seed solution. The difference of crystalline orientations between NH4OH- and NaOH-based seeds is directly observed by lattice-resolved images and electron diffraction patterns using a transmission electron microscope (TEM). This study obviously suggests that metallic impurities incorporated into the ZnO nanocrystal seeds are one of the factors that generates the misaligned ZnO nanowires. This method also enables the use of silicon oxide substrates for the growth of vertically aligned nanowires, making ZnO nanostructures compatible with widely used silicon fabrication technology.
Collapse
Affiliation(s)
- Jinhyun Cho
- Department of Electrical and Computer Engineering, Fitzpatrick Institute for Photonics, Duke University, Durham, North Carolina 27708, USA.
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Athauda TJ, Madduma-Bandarage USK, Vasquez Y. Integration of ZnO/ZnS nanostructured materials into a cotton fabric platform. RSC Adv 2014. [DOI: 10.1039/c4ra12074d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Inorganic semiconductor ZnO/ZnS nanostructures were coupled to flexible natural fibrous materials for potential applications that include wearable electronics, protective textiles, portable and flexible photovoltaic and solar cell devices.
Collapse
Affiliation(s)
| | | | - Yolanda Vasquez
- Department of Chemistry
- Oklahoma State University
- Stillwater, USA
| |
Collapse
|
11
|
Xiong HM. ZnO nanoparticles applied to bioimaging and drug delivery. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:5329-35. [PMID: 24089351 DOI: 10.1002/adma.201301732] [Citation(s) in RCA: 263] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 06/04/2013] [Indexed: 05/20/2023]
Abstract
The last decade has seen significant achievements in biomedical diagnosis and therapy at the levels of cells and molecules. Nanoparticles with luminescent or magnetic properties are used as detection probes and drug carriers, both in vitro and in vivo. ZnO nanoparticles, due to their good biocompatibility and low cost, have shown promising potential in bioimaging and drug delivery. The recent exciting progress on the biomedical applications of ZnO-based nanomaterials is reviewed here, along with discussions on the advantages and limitations of these advanced materials and suggestions for improving methods.
Collapse
Affiliation(s)
- Huan-Ming Xiong
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China.
| |
Collapse
|
12
|
Liu X, Swihart MT. A general single-pot heating method for morphology, size and luminescence-controllable synthesis of colloidal ZnO nanocrystals. NANOSCALE 2013; 5:8029-36. [PMID: 23873224 DOI: 10.1039/c3nr02571c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Here we demonstrate a single-pot heating approach for controllable synthesis of colloidal zinc oxide nanocrystals from zinc acetylacetonate. Such single-pot heating approaches are inherently amenable to large scale production. We have systematically studied the crystallization process, investigating the growth of nanocrystals and the influence of ligands on the morphology and luminescence of ZnO nanoparticles. We show that the morphology can be tuned to produce dendritic structures, nano-needles, nano-pinecones, nanoclusters, hexagonal pyramid nanoparticles and irregularly-shaped nanoparticles by varying the surfactants and co-surfactants used in synthesis. Moreover, we investigated the effect of ligands on the defect-related photoluminescence of ZnO NPs and demonstrated blue, green, white, yellow, and orange emission. This study opens up new possibilities for the practical use of ZnO nanomaterials for optoelectronic devices and bio-imaging.
Collapse
Affiliation(s)
- Xin Liu
- Department of Chemical and Biological Engineering, University at Buffalo (SUNY), Buffalo, NY 14260, USA
| | | |
Collapse
|
13
|
Jang LW, Jeon DW, Sahoo T, Jo DS, Ju JW, Lee SJ, Baek JH, Yang JK, Song JH, Polyakov AY, Lee IH. Localized surface plasmon enhanced quantum efficiency of InGaN/GaN quantum wells by Ag/SiO2 nanoparticles. OPTICS EXPRESS 2012; 20:2116-23. [PMID: 22330452 DOI: 10.1364/oe.20.002116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Optical properties of InGaN/GaN multi-quantum-well (MQW) structures with a nanolayer of Ag/SiO2 nanoparticle (NP) on top were studied. Modeling and optical absorption (OA) measurements prove that the NPs form localized surface plasmons (LSP) structure with a broad OA band peaked near 440-460 nm and the fringe electric field extending down to about 10 nm into the GaN layer. The presence of this NP LSP electrical field increases the photoluminescence (PL) intensity of the MQW structure by about 70% and markedly decreases the time-resolved PL (TRPL) relaxation time due to the strong coupling of MQW emission to the LSP mode.
Collapse
Affiliation(s)
- Lee-Woon Jang
- School of Advanced Materials Engineering and Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 561-756, South Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Demyanets LN, Kireev VV, Li LE, Artemov VV. Thin films of ZnO:M synthesized by ultrasonic spray pyrolysis. RUSS J INORG CHEM+ 2011. [DOI: 10.1134/s0036023611100056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
15
|
Solis-Pomar F, Meléndrez MF, Esparza R, Pérez-Tijerina E. Pb(core)/ZnO(shell) nanowires obtained by microwave-assisted method. NANOSCALE RESEARCH LETTERS 2011; 6:553. [PMID: 21985637 PMCID: PMC3236616 DOI: 10.1186/1556-276x-6-553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 10/10/2011] [Indexed: 05/31/2023]
Abstract
In this study, Pb-filled ZnO nanowires [Pb(core)/ZnO(shell)] were synthesized by a simple and novel one-step vapor transport and condensation method by microwave-assisted decomposition of zinc ferrite. The synthesis was performed using a conventional oven at 1000 W and 5 min of treatment. After synthesis, a spongy white cotton-like material was obtained in the condensation zone of the reaction system. HRTEM analysis revealed that product consists of a Pb-(core) with (fcc) cubic structure that preferentially grows in the [111] direction and a hexagonal wurtzite ZnO-(Shell) that grows in the [001] direction. Nanowire length was more than 5 μm and a statistical analysis determined that the shell and core diameters were 21.00 ± 3.00 and 4.00 ± 1.00 nm, respectively. Experimental, structural details, and synthesis mechanism are discussed in this study.
Collapse
Affiliation(s)
- F Solis-Pomar
- Laboratorio de Nanociencias y Nanotecnología CICFiM (FCFM), Universidad Autónoma de Nuevo León, Monterrey, Nuevo León 66450, México
- Centro de Innovación, Investigación y Desarrollo en Ingeniería y Tecnología (CIIDIT) de la UANL-PIIT, Apodaca, Nuevo León 66600, México
| | - MF Meléndrez
- Department of Materials Engineering (DIMAT), Faculty of Engineering, 270 Edmundo Larenas, Casilla 160-C, University of Concepcion, Concepcion, Chile
| | - R Esparza
- International Center for Nanotechnology and Advanced Materials, Department of Physics & Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - E Pérez-Tijerina
- Laboratorio de Nanociencias y Nanotecnología CICFiM (FCFM), Universidad Autónoma de Nuevo León, Monterrey, Nuevo León 66450, México
- Centro de Innovación, Investigación y Desarrollo en Ingeniería y Tecnología (CIIDIT) de la UANL-PIIT, Apodaca, Nuevo León 66600, México
| |
Collapse
|
16
|
Wang T, Liu Y, Xu Y, He G, Li G, Lv J, Wu M, Sun Z, Fang Q, Ma Y, Li J. Synthesis of 1D and heavily doped Zn1−xCoxO six-prism nanorods: improvement of blue–green emission and room temperature ferromagnetism. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12721g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Shi HY, Deng B, Zhong SL, Wang L, Xu AW. Synthesis of zinc oxide nanoparticles with strong, tunable and stable visible light emission by solid-state transformation of Zn(ii)–organic coordination polymers. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10809c] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Chen S, Lim HE, Miyata Y, Kitaura R, Bando Y, Golberg D, Shinohara H. Transformation of ionic liquid into carbon nanotubes in confined nanospace. Chem Commun (Camb) 2011; 47:10368-70. [DOI: 10.1039/c1cc14154f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
19
|
Patil AB, Patil KR, Pardeshi SK. Ecofriendly synthesis and solar photocatalytic activity of S-doped ZnO. JOURNAL OF HAZARDOUS MATERIALS 2010; 183:315-23. [PMID: 20688430 DOI: 10.1016/j.jhazmat.2010.07.026] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 07/07/2010] [Accepted: 07/08/2010] [Indexed: 05/11/2023]
Abstract
The S-doped ZnO was prepared by new ecofriendly method, which involves simple mechanochemical synthesis followed by thermal decomposition of bisthiourea zinc oxalate (BTZO) powders. The BTZO was characterized by FTIR and TG-DTA analysis while S-doped ZnO crystallite was characterized by XRD, XPS, SEM, EDXS, and photoluminescence (PL) spectra. X-ray diffraction data suggest the single phase wurtzite structure for S-doped ZnO and the incorporation of sulfur expand the lattice constants of ZnO. Room temperature PL spectra show more number of oxygen vacancies in S-doped ZnO as compare to that of pure ZnO. Photocatalytic activity of S-doped ZnO was checked by means of solar photocatalytic degradation (PCD) of resorcinol, using a batch photoreactor. The PCD efficiency of S-doped ZnO was found to be 2 times greater than that of pure ZnO. The inherent relationship between PL intensity and photocatalytic activity of S-doped ZnO was discussed.
Collapse
Affiliation(s)
- Ashokrao B Patil
- Department of Chemistry, University of Pune, Ganeshkhind, Pune 411007, India
| | | | | |
Collapse
|
20
|
Bera D, Qian L, Tseng TK, Holloway PH. Quantum Dots and Their Multimodal Applications: A Review. MATERIALS 2010. [PMCID: PMC5445848 DOI: 10.3390/ma3042260] [Citation(s) in RCA: 421] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Semiconducting quantum dots, whose particle sizes are in the nanometer range, have very unusual properties. The quantum dots have band gaps that depend in a complicated fashion upon a number of factors, described in the article. Processing-structure-properties-performance relationships are reviewed for compound semiconducting quantum dots. Various methods for synthesizing these quantum dots are discussed, as well as their resulting properties. Quantum states and confinement of their excitons may shift their optical absorption and emission energies. Such effects are important for tuning their luminescence stimulated by photons (photoluminescence) or electric field (electroluminescence). In this article, decoupling of quantum effects on excitation and emission are described, along with the use of quantum dots as sensitizers in phosphors. In addition, we reviewed the multimodal applications of quantum dots, including in electroluminescence device, solar cell and biological imaging.
Collapse
Affiliation(s)
- Debasis Bera
- Authors to whom correspondence should be addressed; E-Mails: (D.B.); (P.H.H.); Tel.: 352-846-3331; Fax: 352-392-4911 202
| | | | | | - Paul H. Holloway
- Authors to whom correspondence should be addressed; E-Mails: (D.B.); (P.H.H.); Tel.: 352-846-3331; Fax: 352-392-4911 202
| |
Collapse
|
21
|
Chen P, Ma X, Zhang Y, Li D, Yang D. Electrophotoluminescence of sol-gel derived ZnO film: effect of electric field on near-band-edge photoluminescence. OPTICS EXPRESS 2009; 17:11434-11439. [PMID: 19582058 DOI: 10.1364/oe.17.011434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The effect of electric field on near-band-edge (NBE) photoluminescence (PL) of a sol-gel derived ZnO film has been investigated via a SiO(2)/ZnO/SiOx(x < 2) double-barrier structure on Si under different forward biases. A forward current-voltage curve is characterized by a negative-differential-resistance (NDR) region, which follows a normal region. With an increase of forward bias the NBE PL of the ZnO film is enhanced in the normal region, but it is attenuated in the NDR region. The increase of forward bias also causes the NBE PL of the ZnO film to blueshift from approximately 377.6 to approximately 374.9 nm no matter how current changes. The mechanism for the effect of bias on the intensity and position of NBE PL of the ZnO film is discussed.
Collapse
Affiliation(s)
- Peiliang Chen
- Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | | | | | | | | |
Collapse
|
22
|
Chen D, Viswanatha R, Ong GL, Xie R, Balasubramaninan M, Peng X. Temperature Dependence of “Elementary Processes” in Doping Semiconductor Nanocrystals. J Am Chem Soc 2009; 131:9333-9. [PMID: 19566099 DOI: 10.1021/ja9018644] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dingan Chen
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Ranjani Viswanatha
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Grace L. Ong
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Renguo Xie
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Mahalingam Balasubramaninan
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Xiaogang Peng
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| |
Collapse
|
23
|
Li JY, Li H. Physical and Electrical Performance of Vapor-Solid Grown ZnO Straight Nanowires. NANOSCALE RESEARCH LETTERS 2008; 4:165-168. [PMID: 20596357 PMCID: PMC2894214 DOI: 10.1007/s11671-008-9218-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2008] [Accepted: 11/11/2008] [Indexed: 05/07/2023]
Abstract
Physical and electrical properties of wurtzitic ZnO straight nanowires grown via a vapor-solid mechanism were investigated. Raman spectrum shows four first-order phonon frequencies and a second-order Raman frequency of the ZnO nanowires. Electrical and photoconductive performance of individual ZnO straight nanowire devices was studied. The results indicate that the nanowires reported here are n-type semi-conductors and UV light sensitive, and a desirable candidate for fabricating UV light nanosensors and other applications.
Collapse
Affiliation(s)
- JY Li
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, China
| | - H Li
- Institute of Microstructure and Properties of Advanced Material, Beijing University of Technology, Beijing, China
| |
Collapse
|
24
|
|
25
|
Li J, Peng H, Liu J, Everitt HO. Facile Gram‐Scale Growth of Single‐Crystalline Nanotetrapod‐Assembled ZnO Through a Rapid Process. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701306] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianye Li
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
- Department of Physical Chemistry, University of Science & Technology Beijing, Beijing, China
| | - Hongying Peng
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
- Present address: GE Global Research Center, Niskayuna, New York 12309, USA
| | - Jie Liu
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
| | - Henry O. Everitt
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
- U.S. Army Aviation & Missile Research, Development & Engineering Center, Redstone Arsenal, Alabama 35898, USA
| |
Collapse
|
26
|
Fingermark detection based on the in situ growth of luminescent nanoparticles—Towards a new generation of multimetal deposition. Forensic Sci Int 2008; 179:39-43. [DOI: 10.1016/j.forsciint.2008.04.008] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2008] [Accepted: 04/12/2008] [Indexed: 11/17/2022]
|
27
|
Bardhan R, Wang H, Tam F, Halas NJ. Facile chemical approach to ZnO submicrometer particles with controllable morphologies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:5843-7. [PMID: 17447801 DOI: 10.1021/la070146c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We have developed a simple wet-chemistry approach to fabricating ZnO submicrometer particles with unique morphologies including rings, bowls, hemispheres, and disks. The size and morphology of the particles can be conveniently tailored by varying the concentrations of the zinc precursor. The reaction temperature, pH, and concentration of ammonia are also found to play critical roles in directing the formation of these particle morphologies. These submicrometer particles exhibit strong white-light emission upon UV excitation as a result of the presence of surface defect states resulting from the fabrication method and synthesis conditions.
Collapse
Affiliation(s)
- Rizia Bardhan
- Department of Chemistry, Rice University, Houston, Texas 77005, USA
| | | | | | | |
Collapse
|