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Mechanical characterization of hotplate synthesized vanadium oxide nanobelts / Yanwu Zhu in Acta materialia, Vol. 58 N° 2 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 415-420 Titre : Mechanical characterization of hotplate synthesized vanadium oxide nanobelts Type de document : texte imprimé Auteurs : Yanwu Zhu, Auteur ; Yousheng Zhang, Auteur ; Ling Dai, Auteur Article en page(s) : pp. 415-420 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Vanadium  oxide  Nanobelts  Young’s  modulus  Structure  characterization Index. décimale : 669 Métallurgie Résumé : 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Mechanical characterization of hotplate synthesized vanadium oxide nanobelts [texte imprimé] / Yanwu Zhu, Auteur ; Yousheng Zhang, Auteur ; Ling Dai, Auteur . - pp. 415-420. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 415-420 Mots-clés : Vanadium  oxide  Nanobelts  Young’s  modulus  Structure  characterization Index. décimale : 669 Métallurgie Résumé : 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]