一种超亲水自清洁、智能控温的钨掺杂二氧化钒薄膜的制备及其性能表征

Preparation and Characterization of Tungsten-doped Vanadium Dioxide Thin Films with Self-cleaning and Energy-saving Functions

本实验采用一种简单、低成本有效的溶胶-凝胶法制备了热致变色钨掺杂二氧化钒薄膜。首先将乙酰丙酮氧钒和氯化钨置于甲醇溶液中反应制备出前驱体,然后将前驱物旋涂在衬底基材上。最后在氩气氛围中、600℃进行退火。同时,对所制备的二氧化钒薄膜进行了XRD、XPS、SEM、UV和WCA等表征和测试。结果表明,钨掺杂二氧化钒薄膜颗粒尺寸范围从30～150nm,薄膜的表面展现出优异的亲水性,其静态水接触角为12°。根据光学测试,钨掺杂VO_2薄膜表现出优异的光学性能与可见光调节效率(Tlum,s=80.75%,Tlum,m=79.24%)和优良的太阳能调节效率(ΔTsol=9.10%,Tsol,s=81.40%,Tsol,m=72.30%)。VO_2薄膜相变表现出可适用的相变温度:在钨掺杂摩尔量为2%时,其相变温度为32℃。

In this paper,a simple and cost effective sol-gel process is developed for producing thermochromic tungsten-doped thin films of vanadium dioxide(VO2).The precursor is first prepared by the reaction of vanadyl acetylacetonate,methanol,and tungsten chloride in a beaker.The precursor is then spin-coated on the substrate and,finally,annealed at 600℃in argon gas.The resulting vanadium dioxide thin films are characterized by X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,variable temperature UV/Vis spectroscopy,and contact angle measurements.The results indicate that the particles of tungsten-doped vanadium dioxide thin films range from 30—150nm,and the thin films show excellent hydrophilicity with a water contact angle(WCA)of 12°.According to optical tests,the tungsten-doped vanadium dioxide thin films exhibit satisfactory optical properties with an applicable integrated luminous transmittance(Tlum,s=80.75%,Tlum,m= 79.24%)and excellent solar regulation efficiency(ΔTsol=9.10%,Tsol,s=81.40%,Tsol,m =72.30%).The VO2 films exhibit an applicable transition temperature of the semiconductor-to-metal phase change:at a W-doping level of 2%,the transition temperature was measured to be 32℃.