草酸诱导合成WO_3粉体与其光致变色性质

Synthesis and photochromic properties of WO_3 powder induced by oxalic acid

采用草酸有机诱导在水热条件下制备了形貌新颖的WO3粉体，使用XRD，SEM，BET等手段进行结构和形貌表征，并利用紫外-可见光谱仪（UV-Vis）及测色计对所制备的样品进行光致变色性能测试．结果表明，合成的WO3粉体仍为六方相，以草酸为诱导剂合成的粉体由大小及形状较为均匀的梭形组成，颗粒长在200～300nm之间，宽在30～50nm左右，长宽比为4～10之间，这种特殊的形貌改善了粉体对激发光源的吸收能力，从而提高了合成的WO3粉体的光致变色．性能．

Tungsten trioxide powder with the novel morphology was prepared via the hydrothermal method with oxalic acid as the organic inducer, the structure and shape of which were detected by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and BET. Furthermore, photochromic properties of the as-prepared powder samples were tested by an ultraviolet-visible spectrophotometer （UV-Vis） combined with a color difference meter. The corresponding results indicated that the induced product was still hexagonal WOs, made up of regularly spindle particles with 200-300 nm in length and 30-50 nm in width. The ratio of the length and width was from 4 to 10. Moreover, the special morphology improved its absorptive capacity to the excitation light source, resulting in its high photochromic properties.