基于CaFe_(2)O_(4)/Zn_(2)SnO_(4)异质结型气体传感器的构建及其乙醇气敏性能优化机制  

Preparation of Gas Sensor Based on CaFe_(2)O_(4)/Zn_(2)SnO_(4) Heterojunctions and Its Optimization Mechanism for Ethanol

作　　者：郭威威 雒润东 张合静 李晓丹 韩利雄 GUO Weiwei;LUO Rundong;ZHANG Hejing;LI Xiaodan;HAN Lixiong(Chongqing Key Laboratory of Catalysis and New Functional Materials,College of Environment and Resources,Chongqing Technology and Business University,Chongqing 400067,China;Chongqing Advanced Photoelectric Display Technology Research Institute,Chongqing 401346,China;Chongqing Polycomp International Corporation,Chongqing 400000,China)

机构地区：[1]重庆工商大学环境与资源学院,催化与环境新材料重庆市重点实验室,重庆400067 [2]重庆先进光电显示技术研究院,重庆401346 [3]重庆国际复合材料股份有限公司,重庆400000

出　　处：《硅酸盐学报》2024年第7期2296-2307,共12页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(61604025);重庆市教育委员会科学技术研究项目(KJQN202100814);重庆市研究生科研创新项目(CYS23551);重庆市研究生联合培养基地科研创新项目(2372055)。

摘　　要：乙醇是一种无色、易燃易爆、挥发性强的有机化合物,属于挥发性有机污染物(VOCs)。在人体健康和酒驾检测中是一种重要的标志性气体。采用水热法制备了CaFe_(2)O_(4)、Zn_(2)SnO_(4)和CaFe_(2)O_(4)/Zn_(2)Sn O_(4)复合材料,并对晶体结构、元素组成、形貌、光学和电化学性质进行了分析,以及对CaFe_(2)O_(4)/Zn_(2)Sn O_(4)的气敏性能进行了研究。结果表明,4%(摩尔分数)CaFe_(2)O_(4)/Zn_(2)SnO_(4)的气敏性能优于Zn_(2)SnO_(4)和CaFe_(2)O_(4),在400℃4%CaFe_(2)O_(4)/Zn_(2)SnO_(4)对40μmol/L乙醇的灵敏度值为96,响应、恢复时间分别为21 s和63 s,并具有优异的选择性和良好的稳定性。在此基础上,深入研究了CaFe_(2)O_(4)/Zn_(2)SnO_(4)气敏性能优化的机制。Introduction Ethanol is one of volatile organic compounds.Long-term exposuring ethanol vapors can cause serious human-being health problems,such as headaches,throat irritation,and liver damage dirty.In addition,the human body will have nerve paralysis,slow brain response,and uncontrolled limbs when ethanol in the human blood reaches a certain concentration,resulting in frequent traffic accidents.It is thus necessary to develop gas sensors that can monitor ethanol in the human body.Metal oxide gas sensors have attracted much attention because of their cheap price,convenient portability and stable performance.Zn_(2)SnO_(4) and CaFe_(2)O_(4) are novel ternary metal oxide semiconductors with the advantages of high electron migration rate,strong gas adsorption and good thermal stability,which are widely used in gas sensors.However,single Zn_(2)SnO_(4) or CaFe_(2)O_(4) generally has the disadvantages of poor selectivity,high operating temperature and long response-recovery time.Some studies indicate that combining two different metal oxides to construct heterojunctions could greatly improve the gas sensing properties.It is prospected that the construction of CaFe_(2)O_(4)/Zn_(2)SnO_(4) heterojunction is an effective method to enhance the gas sensing performance.However,little work on CaFe_(2)O_(4)/Zn_(2)SnO_(4) composite for ethanol detection has been reported yet.In this paper,a p-n heterojunction between CaFe_(2)O_(4) and Zn_(2)SnO_(4) was constructed by a hydrothermal method to realize the superior gas sensing properties of CaFe_(2)O_(4)/Zn_(2)SnO_(4) composite to detect ethanol.Methods To prepare Zn_(2)SnO_(4)octahedral,2 mmol Zn(CH_(3)COO)_(2)·2H_(2)O and 1 mmol SnCl_(4)·5H_(2)O were dissolved in 70 mL deionized water.Meanwhile,0.1 g CTAB (cetyltrimethyl ammonium bromide) and 15 mmol Na OH were dissolved in the solution above.Afterwards,the solution was stirred for 40 min,transferred into a 100 mL Teflon-lined autoclave and heated at 180℃for 24 h.After reaction,the powder was washed and calcined at 550℃for 2

关 键 词：锡酸锌 铁酸钙 异质结 乙醇 气体传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN379[自动化与计算机技术—控制科学与工程]