文献类型：期刊文献

英文题名：Sequential fabrication of ZnO/BiVO4 heterojunction and Au decoration toward improved isopropanol sensing

作者：Chen, Cheng Feng, Peipei Li, Xiang Wu, Qiang Chen, Jiarong Ouyang, Quansheng Zeng, Wen

第一作者：Chen, Cheng

通信作者：Chen, C[1];Ouyang, QS[2]

机构：[1]Guizhou Minzu Univ, Sch Mat Sci & Engn, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550025, Peoples R China;[3]Shanxi Inst Sci & Technol, Sch Mat Sci & Engn, Jincheng 048011, Peoples R China;[4]Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

第一机构：Guizhou Minzu Univ, Sch Mat Sci & Engn, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Minzu Univ, Sch Mat Sci & Engn, Guiyang 550025, Peoples R China;corresponding author), Shanxi Inst Sci & Technol, Sch Mat Sci & Engn, Jincheng 048011, Peoples R China.

年份：2026

卷号：228

外文期刊名：MICROCHEMICAL JOURNAL

收录：;Scopus(收录号：2-s2.0-105044891382);WOS:【SCI-EXPANDED(收录号:WOS:001830294100001)】；

基金：This work is supported by the Guizhou Provincial Science and Technology Projects (No. ZK [2023] YB152) , the Science and Technology Foundation of Guizhou Minzu University (No. GZMUZK [2022] YB22) .

语种：英文

外文关键词：Gas sensor; Isopropanol detection; BiVO4; Heterojunction

摘要：Isopropanol is a potential biomarker for lung cancer and a widely used industrial solvent, necessitating the development of high-performance sensors for disease diagnosis and occupational safety. Herein, a sequential modification strategy was proposed to enhance the gas-sensing performance of BiVO4 toward isopropanol. ZnO/ BiVO4 (ZnO/BVO) heterojunctions were constructed, followed by Au nanoparticle decoration through a reduction approach. The resulting Au-decorated ZnO/BiVO4 (Au-ZnO/BVO) exhibited a response of 26 toward 100 ppm isopropanol at 250 degrees C, compared to 10 for pristine BiVO4 at 310 degrees C and 20 for ZnO/BVO at 270 degrees C. Results indicated that the sequential modification modulated the band structure, as evidenced by a gradual decrease in work function. The ZnO/BVO heterojunction induced interfacial charge redistribution and generated an additional electron depletion layer, enabling enhanced resistance modulation upon isopropanol exposure. Sequential Au decoration further amplified this effect through electronic and chemical sensitization, while facilitating the generation of more chemisorbed oxygen species. These combined effects contributed to the enhanced resistance change and lowered activation energy for isopropanol oxidation, thus leading to an improved response and a lowered operating temperature.