三氧化钨纳米线的制备及表征

Fabrication and characterization of tungsten trioxide nanowires

采用以二水合钨酸钠、硫酸钾和草酸的混合溶液为前驱液的水热法制备三氧化钨(WO_3)纳米线,研究了添加HCl含量、水热温度和保温时间对WO_3纳米线微观结构的影响。分别利用X射线衍射、扫描电子显微镜、透射电子显微镜和能谱分析仪对WO_3纳米线的晶体结构、微观形貌和元素成分进行表征分析,结果表明,WO_3纳米线具有六方相晶体结构,且沿[200]择优生长;随着HCl含量的增加,WO_3纳米线平均直径、长度均增大;随着水热温度的增加,WO_3纳米线平均直径和比表面积逐渐增加,平均直径高达41.72nm;随着保温时间的增加,WO_3纳米线团聚现象愈加明显。

WO_3 nanowires are produced by the hydrothermal method.In this method,the mixture solution of sodium tungstate,potassium sulfate and oxalic acid is used as the precursor solution,and effects of additive HCl,hydrothermal temperature and holding time on WO_3 nanowires micro structure are also investigated.The crystal structure,micro morphologies and element composition of WO_3 nanowires are characterized by X-ray diffraction,scanning electron microscope,transmission electron microscope and energy dispersive spectrometer respectively.The results show that the structure of WO_3 is coincidence with the hexagonal structured WO_3,grown preferentially along [200].The average diameter and length of WO_3 nanowires increase with the increases of HCl content.The average diameter and specific surface area of WO_3 nanowires increase gradually as the hydrothermal temperature increases.The average diameter is as high as 41.72 nm.The agglomeration of WO_3 nanowires is even more obvious with the increase of holding time.