Mechanical characterization of hotplate synthesized vanadium oxide nanobelts |
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Authors: | Yanwu Zhu Yousheng Zhang Ling Dai Fook-Chiong Cheong Vincent Tan Chorng-Haur Sow Chwee-Teck Lim |
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Affiliation: | 1. National University of Singapore Nanoscience and Nanotechnology Initiative, 2 Engineering Drive 3, Singapore 117581, Singapore;2. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore;3. Division of Bioengineering, National University of Singapore, 2 Engineering Drive 3, Singapore 117576, Singapore;4. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore |
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Abstract: | Vanadium oxide nanobelts have been synthesized on Si or SiN substrates by simply heating vanadium foils on a hotplate. As-grown nanobelts were characterized as V2O5·nH2O (0.3 < n < 1.7) layer structures containing water molecular intercalation. Using an electromechanical resonance method, the Young’s modulus of the nanobelts was measured in situ in a scanning electron microscope. It was found that the Young’s modulus of as-grown nanobelts varied between 5.6 and 98 GPa, with a typical Q-factor of 120. Such scattered values were attributed to the different contents of water molecules in the nanobelts. After annealing at 450 °C in vacuum, the nanobelts were converted to α-V2O5 phase and a polycrystalline structure was observed. The Young’s modulus of the annealed nanobelts showed more consistent values at an average of 28.9 GPa, lower than the calculated modulus of bulk α-V2O5 at 68 GPa. |
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