材料工程2024，Vol.52Issue(2)：218-226,9.DOI:10.11868/j.issn.1001-4381.2022.000167
ZnO:Na纳米晶室温表面光电压气敏机理的研究
Gas sensing mechanism of ZnO:Na nanocrystals at room temperature using surface photovoltage spectroscopy
摘要
Abstract
ZnO nanocrystals with different Na doping concentrations were prepared on PET flexible substrates sputtered with Au/Ti interdigital electrodes by a simple sol gel method.The relationship between the photoassisted room temperature NO2 gas sensing mechanism and surface photovoltage was explored by characterizing the microstructure and optical properties of the sample.The X-ray diffraction(XRD)results show that all samples have the hexagonal wurtzite structure,and Na doping does not exhibit diffraction peaks of Na and its oxides.The room temperature gas sensitivity test results show that Na doped ZnO nanocrystals have excellent room temperature gas sensitivity performance,and 0.94 mg/m3 NO2 is detected,which significantly improves the gas sensitivity response compared to pure ZnO nanocrystals.The experimental results of surface photovoltage spectroscopy(SPV)and ultraviolet visible spectrophotometer(UV-vis)indicate that the room temperature gas sensitivity of doped ZnO samples may be related to their surface defect content and defect energy levels.Na doping can significantly enhance the separation of photo generated charges,while also introducing more oxygen defects(Vo)and active sites to promote the reaction between NO2 gas and surface adsorbed ionized oxygen defects.In addition,the blue shift of the optical bandgap and the newly generated defect energy levels further enhance the sensitivity of NO2 gas.关键词
ZnO/掺杂/表面光电压谱/气敏/叉指电极Key words
ZnO/doping/surface photovoltage spectroscopy/gas sensing/interdigital electrode分类
化学化工引用本文复制引用
隆小芹,哈万·阿仁,王展,梁玉卿,平特伍沙,王子强,孙翼飞,余飞,袁欢..ZnO:Na纳米晶室温表面光电压气敏机理的研究[J].材料工程,2024,52(2):218-226,9.基金项目
国家自然科学基金项目(61901401) （61901401）
中国博士后科学基金资助项目(2020M673172) （2020M673172）
西南民族大学中央高校基本科研业务费专项资金项目(2020NYB02) （2020NYB02）
