文献类型：期刊文献

英文题名：Enhancing the responsiveness of porous LaFeO3 microspheres to ethanol under high humidity

作者：Liu, Shuai[1];Yang, Hang-Fan[1];Chen, Guo-Xiang[1];Wang, Ze-Lin[1];Cui, Yan[2];Li, Shu[1];Qu, Wen-Long[1];Qiu, Jie[3]

机构：[1]Xian Shiyou Univ, Coll Sci, Xian 710065, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Shanghai Jiao Tong Univ, SJTU Paris Elite Inst Technol, Shanghai 200240, Peoples R China

年份：2025

卷号：60

期号：2

起止页码：662

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20245117542791);WOS:【SCI-EXPANDED(收录号:WOS:001377483900001)】；

基金：This work is supported by the National Natural Science Foundation of China (Grant Nos. 11304246 and 12004301), the Shaanxi Fundamental Science Research Project for Mathematics and Physics (Grant No. 22JSY001 and 23JSQ018), the China National Nuclear Corporation LingChuang Project (23GFC-JJ12-936) and the Postgraduate Innovation and Practical Ability Training Program of Xi'an Shiyou University (Grant No. YCS23113098).

语种：英文

外文关键词：Chemical sensors - Gas detectors - Humidity sensors - Hydrothermal synthesis - Lanthanum oxides - Thermal diffusion in gases

摘要：Perovskite oxide has good sensitivity to VOCs gases, but its gas-sensitive properties are negatively affected by high humidity, thereby limiting its potential application in respiratory gas detection. This study focuses on synthesizing porous LaFeO3 of perovskite type used a dual-process method involved hydrothermal synthesis with thermal treatment. The morphology and evolution of porous LaFeO3 microspheres was studied. The LaFeO3 sensors exhibited p-type gas-sensitive behavior with notable selectivity for respiratory gases. The LaFeO3 sensor represented a significant response value of 9.7 to a 100 ppm C2H5OH concentration, with a rapid response/recovery time of 8 s/9 s at 300 degrees C. The sensor demonstrated a high response (S = 4.2) and a low detection limit of 100 ppb at 90% relative humidity. The superior sensor performance was due to the porous surface structure of LaFeO3 microspheres, which improved the gas diffusion channels and reaction sites with microspheres. The density of states map revealed a strong orbital hybridization between C2H5OH and LaFeO3, resulted in a calculated adsorption energy of - 1.18 eV, signified a strong adsorption affinity in line with the experimental results.