Authors: JemKun Chen YanXun He ChungLin Li
Publish Date: 2012/03/23
Volume: 47, Issue: 13, Pages: 5287-5297
Abstract
In this study we synthesized vanadium V nanoparticles precursor NH45VO6CO34OH9·10H2O a twophase system of toluene and water Colloid solution including titaniumIV isopropoxide and polyvinylpyrrolidone PVP was subsequently deposited onto the nanoparticles to form urchinlike structures in a toluene solution as the vanadium–titanium V–Ti complex precursor Calcining the urchinlike precursor at 700 °C generated nanowhiskers of the Ti/V oxide complex after annealing process These nanowhiskers were characterized using transmission electron microscopy TEM scanning electron microscopy SEM Xray diffraction XRD and Xray photoelectron microscopy XPS Films of the Ti/V oxide nanowhisker structure exhibited good visible transparency and a large change in transmittance at nearinfrared NIR wavelengths before and after the metal–insulator phase transition For a 44nmthick singlelayer nanowhisker thin film the transmittances at 700 nm in the metallic M and semiconductive S states were 75 and 722 respectively the NIR switching efficiency ΔT 2000 increased from 17 to 213 at 2000 nm under UV light irradiation In addition the nanowhisker thin film of the Ti/V oxide complex significantly enhanced the photodecomposition of methylene blue under UV irradiation relative to that of the unmodified TiO2 The dual functions of this material—thermochromicity and photocatalytic behavior—suggest that it might have interesting applications in energysaving smart windows
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