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水热法制备WO3纳米棒阵列及其光催化性能
作者姓名:郑锋  郭敏  张梅
作者单位:北京科技大学钢铁冶金新技术国家重点实验室, 北京 100083
基金项目:国家自然科学基金资助项目(51072022;50872011)
摘    要:采用水热法,以Na2WO4·2H2O为原料,NaCl为添加剂,直接在氧化铟锡透明导电基底上制备了有序WO3纳米棒阵列.利用X射线衍射、扫描电子显微镜、透射电子显微镜和高分辨透射电子显微镜等手段对制备的纳米棒进行了表征,考察了pH值对产物形貌、尺寸和取向性的影响.结果表明:单根WO3纳米棒具有六方单晶结构,随着前驱液pH值的增大,平行于基底生长的WO3纳米棒捆逐渐转变为垂直于基底生长的纳米棒阵列.另外,对制备得到的两种不同取向的WO3纳米棒结构进行了光催化降解甲基蓝溶液的研究,发现相比于WO3纳米棒捆结构,纳米棒阵列的光催化性能更高. 

关 键 词:三氧化钨    纳米棒    阵列    水热法    光催化
收稿时间:2013-03-20

Hydrothermal preparation of WO3 nanorod arrays and their photocatalytic properties
Affiliation:State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Abstract:WO3 nanorod arrays were prepared on indium tin oxide (ITO) substrates by hydrothermal synthesis with Na2WO4·2H2O as a raw material and NaCl as an additive. The nanorods were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. The effects of pH values on the morphology, size, and orientation of products were studied. The results show that the single crystalline WO3 nanorod is hexagonal. When the pH value of the precursor solution increases, WO3 nanorod bundles parallel to the substrate turn into nanorod arrays vertical to the substrate. In addition, two different orientation WO3 nanorod structures were investigated by photocatalytic degradation of methyl blue solutions. It is found that the photocatalytic property of WO3 nanorod arrays is better than that of WO3 nanorod bundles. 
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