双金属银铜氧化物溴化刻蚀制备多孔纳米CuO及其硫化氢气体传感性能研究

基于CTAB对双金属银铜氧化物Ag₂Cu₂O_x的刻蚀及硫代硫酸钠溶解副产物AgBr的方法制备了两种多孔纳米CuO骨架结构,并且利用X射线衍射仪,X射线光电子能谱仪和洛伦兹透射电镜进一步研究了刻蚀机理,结果表明CuO有独特的形貌结构和更大的比表面积。利用所制备的氧化铜具有大孔隙和多位点的优势,开展了H₂S气体传感实验。实验结果显示,在150℃的较低温度下纳米CuO传感器对 500 ppb H₂S仍具有1.7(CuO-Ag₂Cu₂O₃)和1.3(CuO-Ag₂Cu₂O₄)的灵敏度值,响应和恢复时间短,具有良好的选择性和长期稳定性,未来还可以通过构建异质结或者贵金属修饰多孔氧化铜来进一步提高传感性能。

Porous CuO from Ag2Cu2Ox (x=3 or 4) etched by CTAB for H2S gas sensing

Two nanoporous CuO skeleton structures were prepared based on the etching of Ag₂Cu₂O_x by CTAB and the solubility of AgBr by sodium thiosulphate, the etching mechanism was further investigated using XRD, XPS and TEM. Tests showed that the CuO had unique morphology and large specific surface areas. H₂S gas sensing experiments were carried out based on CuO with large pores and multiple sites. Results showed that the sensor based on nano-CuO skeleton structures had the sensitivity of 1.7 (CuO-Ag₂Cu₂O₃) and 1.3 (CuO-Ag₂Cu₂O₄) for 500 ppb H₂S at 150℃ low temperature, and the response and recovery time are short, good selectivity and long-term stability. In the future, the performance could be further improved by constructing heterojunction or modifying porous copper oxide with noble metals.