Properties of hydrothermally processed multi-walled titania nanotubes |
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| Affiliation: | 1. Nanoscience and Soft Matter Laboratory, Department of Physics, Tezpur University, PO Napaam, Assam 784028, India;2. Department of Physics and School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA;1. Earth and Environmental Engineering, Columbia University, New York, NY, United States;2. Civil and Environmental Engineering, Old Dominion University, Norfolk, VA, United States;3. ARA Consult GmbH, Unterbergerstraβe 1, Innsbruck, Austria;4. DC Water Authority, Washington DC, United States;5. Hampton Roads Sanitation District, Virginia Beach, VA, United States;1. College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, PR China;2. Provincial Key Laboratory of Oil & Gas Chemical Technology, Northeast Petroleum University, Daqing 163318, PR China;1. Department of Physics, Recep Tayyip Erdogan University, 53000 Rize, Turkey;2. Department of Physics, Middle East Technical University, 06800 Ankara, Turkey;3. Dipartimento di Scienze Chimiche e Farmaceutiche, Università degli Studi di Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy;1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China;2. Zhejiang Huayou Cobalt Co., Ltd., Tongxiang 314500, PR China |
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| Abstract: | We report here, the production principle and optical characteristics of TiO2 nanotubes (TNTs) grown via a hydrothermal route. As compared to TiO2 nanoparticles (TNPs), X-ray diffraction study of TNTs exhibited weak diffraction signals along with a characteristic peak at 2θ=9.2°. The morphological study of TNTs was carried out by high resolution transmission electron microscopy (HRTEM) which revealed that each of the TNTs is made of 5–7 walls having an average wall-spacing of 0.36 nm. From the UV–vis optical absorption spectroscopy studies, the optical band gap was estimated to be 3.16 eV, for TNTs and 3.22 eV, for TNPs. The Fourier transform infrared spectroscopy study of TNTs has indicated the presence of Ti–O–Ti stretching vibrations in the range 400–800 cm−1. The electron–phonon coupling parameter was found to be smaller for TNTs (S=0.7) than TNPs (S=1.3). The production of submicron sized long multiwall nanotubes would find scope in nanofluidic and other hybrid devices. |
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