Cu_2O多面体的制备及其气敏性能研究

Preparation of Cu_2O polyhedron and its gas sensing property

在碱性条件下，以聚乙烯吡咯烷酮（PvP）为表面活性剂，CuCl2·H2O为前驱体，维生素C为还原剂，于55℃采用液相回流法制备了氧化亚铜粉体。利用X射线衍射（XRD）和扫描电镜（SZM）对样品的组成和形貌进行分析，同时对其进行了NOx气敏性能测试并探讨了其气敏机理。结果表明：所制备的氧化亚铜呈立方相的Cu2O多面体结构，且粒子大小均一，粒径为400～500nm。该材料在室温下对NO。有较好的气敏响应，对体积分数为9．7×10^-5的NO，的灵敏度可达到20．9％，响应时间为10．2S，是一种很有潜力的气敏材料。

Under alkaline condition, the cuprous oxide polyhedron was prepared by liquid reflux method with polyvinylpyrrolidone （PVP） as the surfactant, CuCl2 · H2O as precursor, vitamin C as the reducing agent, at 55℃. The composition and morphology of the product were characterized by XRD and SEM. The gas sensing performance of the prepared sample to NOx was tested and the gas-sensing mechanism was discussed. The results show that the prepared cuprous oxide is cubic phase of Cu2O with uniform polyhedral shape, and the diameter is 400-500 nm. The product possesses high gas sensing performance to NOx at room temperature, When the volume fraction of NOx is 9.7×10-5, the sensitivity can reach to 20.9%, and the corresponding response time is 10.2 s. All the results suggest the cuprous oxide polyhedron is a potential gas-sensing material.