Unlocking Co_(3)O_(4)–ZnO p-n heterojunction for superior acetone gas sensing detection  

作　　者：Xingxing Liu Tingting Shao Juntang Dong Huirong Kou Fuchun Zhang Yuyang Cheng Jiaming Guo Shuwei Tian Kuldeep K.Saxena Xinghui Liu 

机构地区：[1]School of Physics and Electronic Information,Yan'an University,Yan'an,716000,China [2]Division of Research and Development,Lovely Professional University,Phagwara,India [3]Science and Technology on Aerospace Chemical Power Laboratory,Laboratory of Emergency Safety and Rescue Technology,Hubei Institute of Aerospace Chemotechnology,Xiangyang,441003,China [4]Department of Materials Physics,Saveetha School of Engineering,Saveetha Institute of Medical and Technical Sciences(SIMTS),Thandalam,Chennai,602105,Tamilnadu,India

出　　处：《Progress in Natural Science:Materials International》2024年第5期990-999,共10页自然科学进展·国际材料(英文版)

基　　金：funded by the National Natural Science Foundation of China (Grant No.62264015);the Scientific Research Program of Yan'an University (Grant No. YDRY025);the Information and Communication Engineering Construction Project of Yan'an University

摘　　要：In this study,we synthesized pure ZnO and Co_(3)O_(4)–ZnO precursors with varied Co,Zn ratios via solvothermal method,and then the precursors were calcined at 400℃for 2 h in a muffle furnace under air to obtain composites for acetone detection.The structure,morphology,elemental composition,microstructure and chemical state of these materials were systematically studied by various characterization techniques.Additionally,we also evaluated the gas sensing performance of the composites-based sensors,focusing on optimal operating temperature,baseline resistance,repeatability,stability,selectivity,response/recovery time,and resistance under varying relative humidity.The findings reveal that 3%Co_(3)O_(4)–ZnO-based sensor exhibit the highest response value to 100 ppm acetone(74),showing an enhancement of approximately 9.3 times compared to the pure ZnO-based sensor(8).Furthermore,the 3%Co_(3)O_(4)–ZnO-based sensor demonstrate the advantages of rapid response/recovery times(15 s/2 s),outstanding selectivity,and remarkable stability.The gas sensing mechanism of the composite material is also discussed in detail,which provides insights into the observed enhancement of gas sensing performance.It provides an idea for the follow-up study on gas sensing performance of acetone sensors.

关 键 词：HETEROJUNCTION ACETONE Co_(3)O_(4)-ZnO Gas sensing Solvothermal method 

分 类 号：TQ224.223[化学工程—有机化工] TP212[自动化与计算机技术—检测技术与自动化装置] TB33[自动化与计算机技术—控制科学与工程]