带坑WO_3单晶纳米片的合成与光学性能

Synthesis and Optical Properties of Single Crystal WO_3 Nanoplates with Nano-Pits

以介孔二氧化硅(SBA-15)为硬模板,钨酸钠(Na2WO4·2H2O)为钨源,在酸性条件下,用改进的浸渍-还原法合成了具有纳米坑结构的单晶片状WO3材料.用X射线衍射(XRD)、能量扩散X射线(EDX)、扫描电子显微镜(SEM)、高分辨透射电镜(HRTEM)和紫外-可见光区透射光谱(UV-Vis)等手段对产物的组成、形貌和光学性能进行了表征.结果表明,获得的产物为带有纳米坑结构的单晶片状WO3,且在近紫外-可见光区具有较高的透射率.此外,随着煅烧温度的升高,WO3由单斜相转变为单斜相与正交相的混合相,WO3薄膜的紫外-可见光透射率随煅烧温度升高而升高.

Using tungstate（Na2WO4o2H2O） and mesoporous silica dioxide（SBA-15） as tungsten raw material and hard template respectively,tungsten oxide nanoplates with nano-pits were successfully synthe-sized in the acidic condition by a modified dipping-reduction method.The composition,morphology and optical properties of as-prepared products were characterized by X-ray diffraction（XRD）,energy dispersive X-ray（EDX）,scanning electron microscope（SEM）,high resolution transmission electron microscopy（HRTEM） and ultraviolet-visible transmission spectrum（UV-Vis）.Results showed that the products were single crystal tungsten oxide nanoplates with nano-pits which had higher transmission rate in the near UV-visible region.Furthermore,the WO3 thin films changed from the monoclinic to monoclinic phase and orthogonal phase with the increase of sintered temperature,and the UV-visible light transmittance increased with sintered temperature of WO3 thin film.