KTa0.25Nb0.75O3纳米棒的合成及光催化特性研究

摘要

Single-crystalline KTa0.25Nb0.75O3(KTN) nanorods with an orthorhombic perovskite structure were synthesized by a polymer-assisted hydrothermal method The preferred crystallographic orientation of the nanorods were found to be controllable by using different types of polymers in the process, that is,[00l]-oriented KTN were obtained with the use of polyvinyl alcohol (PVA) and[110]-oriented ones were formed with the use of a combination of polyacrylic acid (PAA) and PVA. The two types of nanorods showed different photocatalytic property and the [00l]-oriented nanorods exhibited a better photocatalytic decolorization effciency than the[ll0] ones.%采用聚合物辅助水热法合成具有正交钙钛矿结构的单晶KTa0.25Nb0.75O3 (KTN)纳米棒.微结构分析表明,聚合物的种类和配比对水热体系中KTN纳米棒的取向生长有重要影响,添加聚乙烯醇(PVA)时可获得[001]取向的KTN,同时添加聚丙烯酸(PAA)和PVA时可获得[110]取向的KTN.此外,两种取向的KTN纳米棒表现出明显不同的光催化性质.