一维WO3-ZnO异质结构的合成及生长机理研究

本文采用两步水热法成功合成出一维WO3-ZnO分级异质结构.TEM表征发现ZnO纳米棒在WO3纳米带表面均匀排列,ZnO纳米棒和WO3均各自沿着[0001]方向生长,且二者之间存在特定的取向关系,即生长方向成44°或者136°角.晶体学分析表明在ZnO和WO3之间存在失配度很小的取向关系,即(0001)WO3//(1(1)02)ZnO和(11(22))WO3//(0001)ZnO,以及经过翻转后出现的(0001)WO3//(1(1)02)ZnO和(11(2)2)WO3//(0001)ZnO.根据实验和晶体学分析结果,本文认为ZnO棒在WO3纳米带上的生长机理是符合Volmer-Weber模型的外延生长.

Synthesis and growth mechanism of WO3-ZnO heterostructure

We report the synthesis of WO3-ZnO heterostructured nanobelt via a simple two-step hydrothermal method. TEM characterization revealed that ZnO nanorods uniformly and regularly grew on the surface of WO3 nanobelt. Both WO3 nanobelt and ZnO nanorods grew along their [0001] directions respectively, with a specific crystallographic relationship that the angle between [0001] ZnO and [ 0001 ] WO3 was either 44° or 136° with ( 0001 ) WO3//( 1(1)02 ) ZnO , (11(22)) WO3//( 0001 ) ZnO , ( 0001 ) WO3//( 1(1)02 ) ZnO and (11(2)2) WO3//(0001) ZnO . According to the experiment results and crystall ographic analysis, an epitaxial growth mechanism based on Volmer-Weber heteroepitaxial growth model is proposed for ZnO nanorodsgrown on WO3 nanobelt.