Thermochromic VO2 nanorods and other vanadium oxides nanostructures |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;2. Institute of Chemistry, Edmund Safra Campus, The Hebrew University, Jerusalem, 91904, Israel;1. Nanosciences African Network (NANOAFNET), Materials Research Department, iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape Province, South Africa;2. Physics Dept., University of Western Cape, Bellville, 7535 Cape Town, South Africa;3. National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, PO Box 395, Pretoria 0001, South Africa;4. UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, PO Box 392, Pretoria, South Africa;1. Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P.O. Box 1129, Hefei, 230031, PR China;2. University of Science and Technology of China, Hefei, 230026, PR China;1. UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, P.O. Box 392, Pretoria, South Africa;2. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa;3. Council for Scientific and Industrial Research, P.O. Box 395, Pretoria 0001, South Africa;4. Physics Department, University of Western Cape, 7535 Belville Cape Town, South Africa;5. Laboratoire de Physique de l’Etat Condensé, Université du Maine Faculte des sciences, UPRESA 6087, 72085, Le Mans Cedex 9, France;1. Key Laboratory of Renewable Energy and Gas Hydrates, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China;2. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, PR China |
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| Abstract: | Thermochromic VO2 nanorods were prepared via thermal conversion of the metastable VO2–B phase synthesized by hydrothermal methods. We observe an increased thermochromic transition temperature to ∼75–80 °C by variable-temperature infrared spectroscopy. Nano- and sub-micron structures of other vanadium oxides (V3O7, (NH4)0.5V2O5, and V2O5) were obtained simply by varying the starting materials in the hydrothermal synthesis. We also obtained nanostructures of the high temperature tetragonal rutile phase of VO2 by thermolysis of single-source vanadium (IV) precursors. |
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