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Abdulrahman AF, Abd-Alghafour N, Almessiere MA. A high responsivity, fast response time of ZnO nanorods UV photodetector with annealing time process. OPTICAL MATERIALS 2023; 141:113869. [DOI: 10.1016/j.optmat.2023.113869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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On the possibility of ferromagnetism and improved dye-sensitized solar cells efficiency in TiO2/ZnO core/shell nanostructures. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.04.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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A Facile Route to the Preparation of Highly Uniform ZnO@TiO 2 Core-Shell Nanorod Arrays with Enhanced Photocatalytic Properties. J CHEM-NY 2017. [DOI: 10.1155/2017/8579896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Design and synthesis of ZnO@TiO2 core-shell nanorod arrays as promising photocatalysts have been widely reported. However, it remains a challenge to develop a low-temperature, low-cost, and environmentally friendly method to prepare ZnO@TiO2 core-shell nanorod arrays over a large area for future device applications. Here, a facile, green, and efficient route is designed to prepare the ZnO@TiO2 nanorod arrays with a highly uniform core-shell structure over a large area on Zn wafer via a vapor-thermal method at relatively low temperature. The growth mechanism is proposed as a layer-by-layer assembly. The photocatalytic decomposition reaction of methylene blue (MB) reveals that the ZnO@TiO2 core-shell nanorod arrays have excellent photocatalytic activities when compared with the performance of the ZnO nanorod arrays. The improved photocatalytic activity could be attributed to the core-shell structure, which can effectively reduce the recombination rate of electron-hole pairs, significantly increase the optical absorption range, and offer a high density of surface active catalytic sites for the decomposition of organic pollutants. In addition, it is very easy to separate or recover ZnO@TiO2 core-shell nanorod array catalysts when they are used in water purification processes.
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Synthesis, characterization, and photovoltaic properties of TiO2/CdTe core-shell heterostructure for semiconductor-sensitized solar cells (SSSCs). J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3473-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Liu B, Feng C, Zhang X, Zhu L, Wang X, Zhang G, Xu D. Seedless growth of ZnO nanorods on TiO2 fibers by chemical bath deposition. CrystEngComm 2016. [DOI: 10.1039/c5ce01866h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Seedless growth of ZnO nanorods on TiO2 microfibers was reported, and the growth mechanism was demonstrated.
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Affiliation(s)
- Benxue Liu
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
| | - Cong Feng
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
| | - Xingshuang Zhang
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
| | - Luyi Zhu
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
| | - Xinqiang Wang
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
| | - Guanghui Zhang
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
| | - Dong Xu
- State Key Laboratory of Crystal Materials and Institute of Crystal Materials
- Shandong University
- Jinan 250100, PR China
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Guo SY, Han S, Chi B, Pu J, Li J. A facile low-temperature approach to designing controlled amorphous-based titania composite photocatalysts with excellent noble-metal-free photocatalytic hydrogen production. ACS APPLIED MATERIALS & INTERFACES 2014; 6:4743-4751. [PMID: 24611863 DOI: 10.1021/am4054095] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A microporous amorphous-based titania composite photocatalysts has been fabricated using a facile low-temperature (120 °C) synthetic method. Notably, we have successfully prepared the various stages of the amorphous/crystalline heterostructure by simply adjusting the pH value. The high-pH sample favors the formation of amorphous based titania composite structure. Additionally, the BET surface area of the sample increases with the increasing of the pH value, reaching a maximum of 358 m(2) g(-1) when the pH value is 12. Unexpectedly, the H2 productivity of amorphous-based composite photocatalyst without noble metal co-catalyst increases significantly with the increasing pH value, which is attributed to the quickly increasing amorphous, and the highly active catalytic centers created by the synergistic effect between crystalline TiO2 and amorphous ZnO. This study demonstrates that it is possible to improve the properties of the amorphous-based composite photocatalyst by properly modifying the synthesis conditions. The approach presented herein can be applied to the research of controlled amorphous-based composite photocatalytic systems.
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Affiliation(s)
- Si-yao Guo
- School of Materials Science and Engineering, State Key Lab of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology , Wuhan 430074, China
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Decoration of ZnO Nanorods with Coral Reefs like NiO Nanostructures by the Hydrothermal Growth Method and Their Luminescence Study. MATERIALS 2014; 7:430-440. [PMID: 28788465 PMCID: PMC5453124 DOI: 10.3390/ma7010430] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Revised: 01/08/2014] [Accepted: 01/09/2014] [Indexed: 11/17/2022]
Abstract
Composite nanostructures of coral reefs like p-type NiO/n-type ZnO were synthesized on fluorine-doped tin oxide glass substrates by hydrothermal growth. Structural characterization was performed by field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray diffraction techniques. This investigation shows that the adopted synthesis leads to high crystalline quality nanostructures. The morphological study shows that the coral reefs like nanostructures are densely packed on the ZnO nanorods. Cathodoluminescence (CL) spectra for the synthesized composite nanostructures are dominated mainly by a broad interstitial defect related luminescence centered at ~630 nm. Spatially resolved CL images reveal that the luminescence of the decorated ZnO nanostructures is enhanced by the presence of the NiO.
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Kim HJ, Pant HR, Amarjargal A, Kim CS. Incorporation of silver-loaded ZnO rods into electrospun nylon-6 spider-web-like nanofibrous mat using hydrothermal process. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.05.038] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Microwave-assisted and conventional sol-gel preparation of photocatalytically active ZnO/TiO2/glass multilayers. OPEN CHEM 2013. [DOI: 10.2478/s11532-013-0240-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractFor the first time a combination of microwaves and/or the conventional treatment method was used to dry and heat multilayered sol-gel ZnO/TiO2/glass structures. Compact or porous TiO2 films were deposited as a bottom layer, covered with a ZnO film. The structures were characterized by X-ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDX) and Scanning Electron Microscopy (SEM). Only peaks of wurtzite ZnO crystalline phase were registered on the X-Ray diffractograms. The microwave irradiation leads to a formation of poorly crystallized multilayers with very small crystallites and enhanced surface roughness. This results in a better photocatalytic activity of these structures than the structures of the samples treated conventionally. It was established that the morphology of the bottom titania layer affects the reaction of photocatalytic degradation of Malachite Green dye (MG). The structures with the compact bottom TiO2 films showed higher activities than those on porous TiO2 films. This study offers an energy saving method of producing ZnO/TiO2/glass multilayered structures of various morphologies and pronounced photocatalytic properties. The method does not involve any calcination step, normally applied to achieve a good degree of crystallization. This makes the method suitable for protecting substrates of low thermal stability.
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Zhang D. Removal of cationic Rhodamine-B dye using nano-titania with anatase crystalline structure and kinetic analysis of the photocatalytic reaction. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2012. [DOI: 10.1134/s0036024413010056] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sapkal R, Shinde S, Waghmode T, Govindwar S, Rajpure K, Bhosale C. Photo-corrosion inhibition and photoactivity enhancement with tailored zinc oxide thin films. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 110:15-21. [DOI: 10.1016/j.jphotobiol.2012.02.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 01/31/2012] [Accepted: 02/07/2012] [Indexed: 10/28/2022]
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Yan X, Zou C, Gao X, Gao W. ZnO/TiO2 core–brush nanostructure: processing, microstructure and enhanced photocatalytic activity. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15477c] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Chen R, Zou C, Bian J, Sandhu A, Gao W. Microstructure and optical properties of Ag-doped ZnO nanostructures prepared by a wet oxidation doping process. NANOTECHNOLOGY 2011; 22:105706. [PMID: 21289405 DOI: 10.1088/0957-4484/22/10/105706] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Silver-doped zinc oxide (Ag:ZnO) nanostructures were prepared by a facile and efficient wet oxidation method. This method included two steps: metallic Zn thin films mixed with Ag atoms were prepared by magnetron sputtering as the precursors, and then the precursors were oxidized in an O(2) atmosphere with water vapour present to form Ag:ZnO nanostructures. By controlling the oxidation conditions, pure ZnO and Ag:ZnO nanobelts/nanowires with a thickness of ∼ 20 nm and length of up to several tens of microns were synthesized. Scanning electron microscopy, transmission electron microscopy, cathodoluminescence and low temperature photoluminescence (PL) measurements were adopted to characterize the microstructure and optical properties of the prepared samples. The results indicated that Ag doping during magnetron sputtering was a feasible method to tune the optical properties of ZnO nanostructures. For the Ag:ZnO nanostructures, the intensity of ultraviolet emission was increased up to three times compared with the pure ones. The detailed PL intensity variation with the increasing temperature is also discussed based on the ionization energy of acceptor in ZnO induced by Ag dopants.
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Affiliation(s)
- Ruiqun Chen
- Department of Chemical and Materials Engineering, University of Auckland, 20 Symonds Street, Private Bag 92019, Auckland 1142, New Zealand.
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Huang YC, Chang SY, Lin CF, Tseng WJ. Synthesis of ZnO nanorod grafted TiO2 nanotube 3-D arrayed heterostructure as supporting platform for nanoparticle deposition. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11659b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Zou CW, Rao YF, Alyamani A, Chu W, Chen MJ, Patterson DA, Emanuelsson EAC, Gao W. Heterogeneous lollipop-like V2O5/ZnO array: a promising composite nanostructure for visible light photocatalysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11615-11620. [PMID: 20565116 DOI: 10.1021/la101324e] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
ZnO/V(2)O(5) core-shell nanostructures have been prepared by a two-step synthesis route through combined hydrothermal growth and magnetron sputtering. After annealing under oxygen ambience, a ZnO/V(2)O(5) heterogeneous lollipop-like nanoarray formed. The microstructure and crystal orientation of those nanolollipops were investigated by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM), which show single crystal structure. The optical properties were characterized by UV-vis spectroscopy and showed quite different absorption curves for the as-deposited and annealed samples. The ZnO/V(2)O(5) nanolollipops demonstrated excellent photocatalytic activity in terms of decomposing 2,6-dichlorophenol (2,6-DCP) under visible light, indicating their promising potential as catalysts for industrial wastewater and soil pollution treatments.
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Affiliation(s)
- C W Zou
- Department of Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
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Zou CW, Yan XD, Bian JM, Gao W. Enhanced visible photoluminescence of V(2)O(5) via coupling ZnO/V(2)O(5) composite nanostructures. OPTICS LETTERS 2010; 35:1145-1147. [PMID: 20410947 DOI: 10.1364/ol.35.001145] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
V(2)O(5) films capped by a thin ZnO layer had been prepared by sputtering method at room temperature. The initial smooth films transferred to porous composite nanocrystals and nanorods after annealed at 500 degrees C, and enhanced visible light emission was observed. This tremendous enhancement was attributed to the coupling between V(2)O(5) nanorods and ZnO nanoparticles as well as the improved V(2)O(5) crystallinity. Prominent vibrational fine structures of the photoluminescence spectra were also observed.
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Affiliation(s)
- C W Zou
- School of Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
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