Electrical and optical characteristics of surface treated ZnO nanotubes |
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| Authors: | R. Ranjusha R. Sreeja P.A. Mini K.R.V. Subramanian Shantikumar V. Nair Avinash Balakrishnan |
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| Affiliation: | 1. Shandong Province Key Laboratory of Life-Organic Analysis, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China;2. Jining Functional Materials and Surface Treatment Technology R & D Center, Southern Shandong Academy of Engineering Technology, Jining, Shandong 272000, PR China;1. Discipline of Inorganic Materials, and Catalysis and Academy of Scientific and Innovative Research, Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar 364002, Gujarat, India;2. Electro-Membrane Processes Discipline and Academy of Scientific and Innovative Research, Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar 364002, Gujarat, India;1. Department of Physics, University of the Free State, Bloemfontein ZA9300, South Africa;2. Department of Chemistry, University of the Free State, Bloemfontein ZA9300, South Africa;1. Nano-Optoelectronics Research and Technology Laboratory (NOR), School of Physics, Universiti Sains Malaysia, Penang 11800, Malaysia;2. Department of Pharmacology and Toxicology, College of Pharmacy, University of Kufa, Najaf, Iraq;1. Institute of Electronics, Microelectronics and Nanotechnology – UMR 8520 CNRS, University Lille Nord de France, Avenue Poincaré, 59652 Villeneuve d’Ascq, Cedex, France;2. Solar and Photovoltaic Engineering Research Center, King Abdullah University of Sciences and Technology (KAUST), Thuwal, Saudi Arabia;3. Renewable Energy Center, University of Nevada, Reno, USA;1. Department of Physics, Nelson Mandela Metropolitan University, P.O. Box 77000, Port Elizabeth 6031, South Africa;2. Department of Physics, University of the Free State, P.O Box 77000, Bloemfontein ZA9300, South Africa |
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| Abstract: | Vertical ZnO nanotubes were electrochemically deposited onto an indium doped tin oxide glass substrate. These nanotubes were surface treated with zinc acetate and annealed at 450 °C, resulting in a nanotubes/nanoparticles composite layer. Scanning electron microscopy of the surface treated samples showed nanoparticles been dispersed uniformly along the ZnO tubular matrix, which was confirmed by X-ray diffractrometry. Photoluminescence and fluorescence microscopy showed untreated ZnO nanotubes exhibiting blue emission, while the treated samples exhibited green emissions. Ultra-violet spectroscopy of treated samples revealed lower band gap values compare to their untreated counterparts. Lifetime measurements showed higher excitonic lifetimes in treated samples. Conductance studies using atomic force microscopy showed significant improvement in the conductance values for the treated samples. A significant increase in photocurrent was observed in treated samples when used as photo-anodes in dye sensitized solar cells. |
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