Browsing by Author "Wang, Ying-Ting"

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Facile Growth of Thermochromic VO2 Nanostructures with Greatly Varied Phases and Morphologies
(2013-03-04)
Wang, Ying-Ting
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Chen, Chun-Hua
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材料科學與工程學系
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Department of Materials Science and Engineering
We have successfully and reproducibly synthesized a variety of novel vanadium dioxide (VO2) nanostructures, including metastable monoclinic VO2(B) nanoneedles and nanocorals, orthorhombic VO2(O) nanoparticles, and monoclinic VO2(M) nanofacets by manipulating the aging time of a facile sol gel approach and the subsequent postannealing conditions. We envision that this previously unreported highly controlled synthesis and the resulting distinct morphologies of VO2 will not only provide a promising route for reliably selecting the phase, size, and morphology of these nanostructures, as well as achieving a fundamental understanding of their unusual temperature-dependent optical transmittance, but also facilitate the synthesis of functional VO2 nanostructures for a number of novel applications.
Hollow V2O5 Nanoassemblies for High-Performance Room-Temperature Hydrogen Sensors
(2015-04-29)
Wang, Ying-Ting
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Whang, Wha-Tzong
;
Chen, Chun-Hua
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Nanostructured oxides with Characteristic morphologies are essential building blocks for high-performance gas-sensing devices. We describe the high-yield fabrication of a series of functionalized V2O5 nanoassemblies through a facile polyol approach with specific varieties of polyvinylpyrrolidone. The synthesized V2O5 nanoassemblies consisting of tiny one-dimensional nanoblocks with the absence of any extrinsic catalysts exhibit distinct hemispherical or spherical hollow morphologies and operate as room-temperature hydrogen sensors with remarkable sensitivities and responses.