钨酸钠水热法合成晶态WO_3纳米棒及其表征

PREPARATION AND CHARACTERIZATION OF CRYSTAL WO_3 NANORODS SYNTHESIZED WITH SODIUM TUNGSTATE BY THE HYDROTHERMAL METHOD

以钨酸钠为原料,硫酸钾为辅助盐,在强酸性反应体系通过水热法合成了WO3纳米棒。利用XRD、SEM、TEM和SAED对试样进行分析,研究结果表明：在水热法体系中合成WO3纳米棒时,随着pH值的增加和反应温度的升高,二者都有利于WO3纳米棒的合成。在pH值为1.5和反应温度为210℃下合成直径小于100 nm的晶态WO3纳米棒,其直径分布较均匀。对不同条件下水热法合成的WO3进行紫外可见光的吸收光谱分析可得,随着反应体系中pH值的增加和反应温度的升高,获得的WO3的紫外光吸收能力逐渐增强。特别是WO3纳米棒具有良好的紫外光吸收能力。

WO3 nanorods are synthesized with sodium tungstate and potassium sulphate in acid by the hydrothermal method.The samples are characterized by XRD,SEM,TEM and SAED.With the increment of the pH value and the reaction temperature,WO3 nanorods are obtained easily by the hydrothermal method.Crystal WO3 nanorods of less than 100nm in the diameter at 210℃ with pH=1.5 by the hydrothermal method.The crystal WO3 nanorods are homogeneous in the diameter.When it is less than the samples are characterized by UV-VIS,with the increment of the pH value and the reaction temperature,the absorbent power of ultraviolet light of WO3 synthesized by the hydrothermal method enhance gradually.Especially,Single crystal WO3 nanorods take on the good absorbent power of ultraviolet light.