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Chawla AK, Jain R, Singh J, Mir KH, Garg T, Rao AU, Tiwari SK, Chauhan A, Sardana N, Chawla V, Kumar S. Sputter Deposited Mn‐doped ZnO Thin Film for Resistive Memory Applications. ChemistrySelect 2022. [DOI: 10.1002/slct.202203633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Amit K Chawla
- Department of Physics Applied Science Cluster University of Petroleum and Energy Studies Dehradun India- 248007
| | - Ravish Jain
- Department of Physics Guru Nanak Dev University Amritsar India- 143005
| | - Jasvir Singh
- Department of Physics Guru Nanak Dev University Amritsar India- 143005
| | - Kifayat H. Mir
- Department of Physics School of Advanced Sciences Vellore Institute of Technology Vellore Brahmapuram India- 632014
| | - Tarun Garg
- Department of Physics School of Advanced Sciences Vellore Institute of Technology Vellore Brahmapuram India- 632014
| | - Akula Umamaheswara Rao
- Department of Mechanical Engineering Mechanical Cluster University of Petroleum and Energy Studies Dehradun India- 248007
| | - Sunil Kumar Tiwari
- Department of Mechanical Engineering Mechanical Cluster University of Petroleum and Energy Studies Dehradun India- 248007
| | - Avantika Chauhan
- Department of Physics Applied Science Cluster University of Petroleum and Energy Studies Dehradun India- 248007
| | - Neha Sardana
- Department of Metallurgical and Materials Engineering Indian Institute of Technology Ropar Rupnagar India- 140001
| | - Vipin Chawla
- Institute Instrumentation Center Indian Institute of Technology Roorkee Roorkee India- 247667
| | - Sanjeev Kumar
- Department of Chemistry Applied Science Cluster University of Petroleum and Energy Studies Dehradun India- 248007
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Platnich CM, Slaby JS, O’Connell D, Trudel S. Simple solvothermal approach to highly nanostructured hematite thin films. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this work, we present a solvothermal method for the synthesis of hematite thin films on fluorine-doped tin oxide substrates. This simple method uses a precursor solution of iron(III) 2,4-pentanedionate dissolved in ethanol with a microliter-scale amount of water and yields hematite ∼500 nm thick films after annealing. The synthesized films were characterized using an array of methods, including scanning electron microscopy, energy-dispersive X-ray spectroscopy, diffuse reflectance, and powder X-ray diffraction. Incorporating water into the precursor solution provides nucleation sites for the reaction and results show that by altering the amount of water used in the synthesis, it is possible to generate nanocrystalline films of different morphologies, nanocrystal size distributions, and surface areas. This synthetic procedure therefore provides control over the films’ physical and electrochemical characteristics. Doping of hematite thin films is also possible using this synthesis, as exemplified by doping with tin by adding tin(II) 2,4-pentanedionate to the precursor solution. To demonstrate utility, we build prototype photoelectrochemical cells using the synthesized hematite as the photoanode.
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Affiliation(s)
- Casey M. Platnich
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - Jachym S. Slaby
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - David O’Connell
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - Simon Trudel
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
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Improving the Performance of Zinc Oxide Photocatalysts for Phenol Degradation through Addition of Lanthanum Species. JURNAL KIMIA SAINS DAN APLIKASI 2020. [DOI: 10.14710/jksa.23.4.109-116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
One green approach to degrade organic pollutants, such as phenol, is through the photocatalytic reaction. Despite having large band gap energy, which is enough for phenol degradation, zinc oxide (ZnO) has low photocatalytic efficiency. In this study, ZnO was modified by lanthanum (La) species, and the improved photocatalytic activity was confirmed for degradation of phenol under visible and ultraviolet (UV) light irradiation. The ZnO and its modified photocatalysts were prepared by the hydrothermal method in the absence and presence of La species (0.01‒2 wt%). X-ray diffraction (XRD) patterns showed that the addition of La did not disturb the structure of ZnO, but slightly decreased the crystallite size. While the La addition up to 1 wt% did not affect the optical properties of the ZnO, the addition of 2 wt% La slightly red-shifted the absorption band edge of the ZnO. The Fourier-transform infrared (FT-IR) spectra showed La oxide formation observed at 515-540 cm-1 after 2 wt% La addition. Fluorescence emission spectra revealed that synthesized ZnO has oxygen vacancies at 558 nm, and the presence of 1 wt% La did not significantly affect the emission intensity. The photocatalytic activity of ZnO was influenced by the La addition, where the best performance was obtained on the ZnO with 1 wt% La. This study demonstrated that the optimum amount of La species could increase the performance of the ZnO.
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Lee K, Mazare A, Schmuki P. One-dimensional titanium dioxide nanomaterials: nanotubes. Chem Rev 2014; 114:9385-454. [PMID: 25121734 DOI: 10.1021/cr500061m] [Citation(s) in RCA: 506] [Impact Index Per Article: 50.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Kiyoung Lee
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg , Martensstrasse 7, 91058 Erlangen, Germany
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Ling Y, Wang G, Wang H, Yang Y, Li Y. Low-temperature activation of hematite nanowires for photoelectrochemical water oxidation. CHEMSUSCHEM 2014; 7:848-853. [PMID: 24493003 DOI: 10.1002/cssc.201301013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 10/27/2013] [Indexed: 06/03/2023]
Abstract
Hematite (α-Fe2 O3 ) nanostructures have been extensively studied as photoanode materials for photoelectrochemical (PEC) water oxidation. However, the photoactivity of pristine hematite nanostructures is fairly low and typically requires thermal activation at temperature of 650 °C or above. Here, we report a new method for enhancing the photocurrent of hematite nanowires at a substantially lower temperature of 350 °C by means of a two-step annealing process (activation process). Hydrothermally grown β-FeOOH nanowires were first annealed in a pure N2 environment at 350 °C to form magnetite, followed by partial oxidation in air to convert magnetite to hematite. During this process, Fe(2+) sites (oxygen vacancies) were intentionally created to increase the donor density and therefore the electrical conductivity of hematite. The oxygen-deficient hematite nanowire photoanode created at low temperature (350 °C) show considerably enhanced photoactivity compared to pristine hematite sample that prepared by thermal annealing of β-FeOOH nanowires at 550 °C in air. Moreover, this low-temperature annealing method can be coupled with an element doping method to further increase the photoactivity of hematite nanowire. Sn-doped hematite nanowires prepared by the same low-temperature annealing method show at least three fold enhanced photocurrent compared to the undoped sample. Significantly, the highest temperature in the entire annealing process was 350 °C, which is the lowest activation temperature ever reported for hematite nanowire photoanodes.
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Affiliation(s)
- Yichuan Ling
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (USA)
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Yang JM, Zhang W, Liu Q, Sun WY. Porous ZnO and ZnO–NiO composite nano/microspheres: synthesis, catalytic and biosensor properties. RSC Adv 2014. [DOI: 10.1039/c4ra08736d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Porous ZnO and ZnO–NiO nanostructures were found to catalyze the decomposition of ammonium perchlorate and ZnO to biosense DNA hybridization.
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Affiliation(s)
- Ji-Min Yang
- Coordination Chemistry Institute
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing National Laboratory of Microstructures
- Nanjing University
| | - Wei Zhang
- School of Chemistry & Chemical Engineering
- Linyi University
- Linyi 276005, China
| | - Qing Liu
- Coordination Chemistry Institute
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing National Laboratory of Microstructures
- Nanjing University
| | - Wei-Yin Sun
- Coordination Chemistry Institute
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing National Laboratory of Microstructures
- Nanjing University
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Sun K, Madsen K, Andersen P, Bao W, Sun Z, Wang D. Metal on metal oxide nanowire Co-catalyzed Si photocathode for solar water splitting. NANOTECHNOLOGY 2012; 23:194013. [PMID: 22539234 DOI: 10.1088/0957-4484/23/19/194013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report a systematic study of Si|ZnO and Si|ZnO| metal photocathodes for effective photoelectrochemical cells and hydrogen generation. Both ZnO nanocrystalline thin films and vertical nanowire arrays were studied. Si|ZnO electrodes showed increased cathodic photocurrents due to improved charge separation by the formation of a p/n junction, and Si|ZnO:Al (n(+)-ZnO) and Si|ZnO(N(2)) (thin films prepared in N(2)/Ar gas) lead to a further increase in cathodic photocurrents. Si|ZnONW (nanowire array) photocathodes dramatically increased the photocurrents and thus photoelectrochemical conversion efficiency due to the enhanced light absorption and enlarged surface area. The ZnO film thickness and ZnO nanowire length were important to the enhancements. A thin metal coating on ZnO showed increased photocurrent due to a catalyzed hydrogen evolution reaction and Ni metal showed comparable catalytic activities to those of Pt and Pd. Moreover, photoelectrochemical instability of Si|ZnO electrodes was minimized by metal co-catalysts. Our results indicate that the metal and ZnO on p-type Si serve as co-catalysts for photoelectrochemical water splitting, which can provide a possible low-cost and scalable method to fabricate high efficiency photocathodes for practical applications in clean solar energy harvesting.
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Affiliation(s)
- Ke Sun
- Department of Electrical and Computer Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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Tseng YH, Liu MH, Kuo YW, Chen P, Chen CT, Chen YF, Mou CY. Biomimetic ZnO plate twin-crystals periodical arrays. Chem Commun (Camb) 2012; 48:3215-7. [DOI: 10.1039/c2cc16119b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Li J, Zhong H, Liu H, Zhai T, Wang X, Liao M, Bando Y, Liu R, Zou B. One dimensional ternary Cu–Bi–S based semiconductor nanowires: synthesis, optical and electrical properties. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33606e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yang J, Pei Y, Hu R, Fan B, Tong C, Kojima T, Wu Z, Jiang H, Wang G. Morphology controlled synthesis of crystalline ZnO film by MOCVD: from hexagon to rhombus. CrystEngComm 2012. [DOI: 10.1039/c2ce26024g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Huang XH, Zhan ZY, Pramoda KP, Zhang C, Zheng LX, Chua SJ. Correlating the enhancement of UV luminescence from solution-grown ZnO nanorods with hydrogen doping. CrystEngComm 2012. [DOI: 10.1039/c2ce25518a] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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