二氧化钒纳米粉体与聚乙烯吡咯烷酮的复合涂层在智能窗户上的应用

Application of Composite Coating of Vanadium Dioxide Nanopowder and Polyvinylpyrrolidone on Smart Windows

本文以偏钒酸铵为钒源,盐酸肼为还原剂,采用一步水热法制备M相二氧化钒粉体,并将其加入到聚合物聚乙烯吡咯烷酮制备智能控温涂层。运用X-射线电子衍射仪(XRD)、扫面电子显微镜(SEM)、差示扫描量仪(DSC)、X射线能谱仪等研究了钒源和盐酸肼的配比,水热反应温度,对M相VO_(2)粉体形成及结晶性的影响。并将粉体加入到聚乙烯吡咯烷酮分散基质制备智能控温相变薄膜。结果表明:不同物料配比会制备出不同的钒氧化合物,其中n(N_(2)H_(4)·HCl):n(NH_(4)VO_(3))=3:8时,制备的M相VO_(2)纯度较高;水热温度为270℃,粉体的结晶性能较好,SEM图谱显示呈现为球状,增长水热时间有利于M相二氧化钒的生成,制备的薄膜智能调控能力为11.5%,同时使可见光透过率为60%。

In this paper,using ammonium metavanadate as the vanadium source and hydrazine hydrochloride as the reducing agent,the M-phase vanadium dioxide powder was prepared by a one-step hydrothermal method and added to the polymer matrix polyvinylpyrrolidone to prepare the intelligent temperature-controlling coating.Using X-ray electron diffractometer(XRD),scanning electron microscope(SEM),thermal analyzer(DSC),X-ray energy spectrometer,the ratio of vanadium source and hydrazine hydrochloride,hydrothermal reaction temperature,hydrothermal The effect of time on the formation and crystallinity of VO_(2)(M) powder.And the above-mentioned powder with the best crystallinity is added to the polyvinylpyrrolidone dispersion matrix to prepare an intelligent temperature control phase change film.The results show that different material ratios will produce different vanadium oxide compounds,where n(N_(2) H_(4)·HCl):n(NH_(4) VO_(3))=3:8 will produce high purity VO_(2) where the hydrothermal temperature is 270 ℃,The powder has good crystallization performance.The SEM chart shows that it is spherical.The increase of the hydrothermal time is beneficial to the generation of M phase vanadium dioxide.The solar regulation of the thin films is 11.5% while maintaining 60% transmittance.