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. 2016 Mar 15;6:23119. doi: 10.1038/srep23119

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Raman spectrum of 60 nm (001)-VO₂/TiO₂ thin film at (a) 30 °C and (b) 100 °C of the 13-nm (001)-VO₂/TiO₂ thin film at (c) 30 °C and (d) 100 °C. The blue triangles, yellow stars, and green squares and corresponding dotted lines label the Raman peaks in the TiO₂ substrate, the monoclinic phase VO₂, and the tetragonal phase VO₂, respectively. (e) Temperature-dependent Raman spectroscopy of ultrathin (001)-VO₂/TiO₂ thin film. (f) The Raman peaks belong to the tetragonal phase VO₂ and are a function of temperature.