Belt-like VO2(M) with a rectangular cross section: A new route to prepare, the phase transition and the optical switching properties |
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Authors: | Yifu ZhangMeijuan Fan Fei NiuWeibing Wu Chi Huang Xinghai Liu Houbin LiXin Liu |
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Affiliation: | a College of Chemistry and Molecular Sciences, Engineering Research Center of Organosilicon Compound and Material, Ministry of Education of China, Wuhan University, Wuhan 430072, PR China b School of Printing and Packaging, Wuhan University, Wuhan 430079, PR China c School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China |
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Abstract: | Belt-like VO2(M) with a rectangular cross section was first synthesized by the irreversible transformation of VO2(A) at the elevated temperatures under the inert atmosphere to the best of our knowledge. The as-obtained samples were characterized by a combination of techniques including XRD, SEM and TEM. The processes of converting VO2(A) to VO2(M) were briefly discussed. The as-obtained VO2(M) has belt-like morphology with a rectangular cross section with typical lengths up to several tens of micrometers, widths ranging from tens of nanometers to several micrometers, and thicknesses about 60-150 nm. The morphology and size of the VO2(M) were dependent on that of the precursor VO2(A). The phase transition properties of VO2(M) were investigated by DSC, indicating that it exhibited a strong phase transition at 67.9 °C in the heating cycle and 61.1 °C in the cooling cycle. Furthermore, the optical switching property of VO2(M) was studied by the variable-temperature infrared spectra, and it was found that the as-obtained VO2(M) could be used as the optical switch. |
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Keywords: | Vanadium oxides VO2(M) Phase transition Thermal treatment Optical switch |
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