Grain boundary-induced drastic sensing performance enhancement of Fe_(2)O_(3) gas sensors for acetone  

作　　者：Tian-Jun Hu Yi-Fan Li Yu-Zhu Tian Ying Wang Ya-Ru Chen Jun-Ming Zhang Er-Gui Luo Jian-Feng Jia 

机构地区：[1]Key Laboratory of Magnetic Molecules&Magnetic Information Materials Ministry of Education,School of Chemical and Material Science,Shanxi Normal University,Taiyuan 030032,China

出　　处：《Rare Metals》2024年第9期4412-4424,共13页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.21571119 and 22209102);the Program for New Century Excellent Talents in University of Ministry of Education of China(No.NCET-12-1035);the Natural Science Foundation of Shanxi Province(Nos.202203021211253 and 20210302124473);the Postgraduate Innovation Project of Shanxi Normal University(No.2022XSY022);China Postdoctoral Science Foundation(No.2021M691366)。

摘　　要：Exploring the structure-activity relationship between the performance of gas sensors and the structure of semiconductor metal oxide(SMO)nanomaterials is crucial for understanding and designing gas-sensing materials and overcoming the application limitations of SMO-based gas sensors.Regulation of a single SMO microstructure provides a promising solution to address this scientific problem due to its controllable composition.In this study,we control the grain boundary(GB)density of Fe_(2)O_(3)nanomaterials using a simple solvothermal method.They have similar chemical compositions and crystal phases,providing an ideal platform for studying the influence of the GB density on the gas-sensing performance.Gas-sensing tests showed that the Fe_(2)O_(3)-1 sensor with medium GB density and the Fe_(2)O_(3)-2 sensor with high GB density had higher sensitivity and selectivity than the Fe_(2)O_(3)-0 sensors with low GB density before reaching the optimal operating temperature.However,when the GB density increased,the response to acetone decreased slightly,whereas the optimal operating temperature decreased.This work highlights the unique performance of the GB density in enhancing the gas sensitivity of a single SMO.

关 键 词：Semiconductor metal oxide(SMO) Grain boundary(GB)density Oxygen adsorption Charge transfer Gas sensors 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TB381[自动化与计算机技术—控制科学与工程]