金属有机框架衍生微花状NiO-In2O3复合结构的制备及其对超低浓度甲醛气体检测性能的研究OA北大核心CSTPCD
Preparation of Metal Organic Framework-derived Microflower-Like NiO-In2O3 Composite Structure and Its Detection Performance for Ultra-Low Concentration of Formaldehyde Gas
甲醛是工业场所和室内常见的一种有机溶剂,严重危害人类健康,因此开发响应快、检出限低和寿命长的高灵敏度甲醛传感器具有重要价值.以铟基金属有机框架(Indium-based metal organic framework,In-MOF)作为前驱体制备了NiO-In2O3 复合结构,并以In2O3 和NiO-In2O3 作为敏感材料分别构建了甲醛气体传感器,系统研究了传感器对甲醛气体的敏感特性.结果表明,In2O3 材料呈现微花状结构,NiO-In2O3 复合结构则是在In2O3 表面附着NiO纳米颗粒.传感器在相对湿度为33%和75%的环境中对甲醛均具有良好的检测性能,其中NiO-In2O3 复合结构传感器在相同测试条件下对甲醛的响应特性远优于In2O3 传感器,这与NiO的催化作用以及NiO与In2O3 之间形成的异质结构密切相关.NiO-In2O3 复合结构传感器在200℃工作温度下、相对湿度为33%和75%时,对10 μL/L甲醛的响应值分别为21.3和12.6,响应/恢复时间分别为4/6 s和7/10 s,检出限分别为1.2×10-7 μL/L和4.1×10-5 μL/L.此传感器具有优异的选择性和长期稳定性,在低浓度甲醛气体高性能检测领域具有广阔的应用前景.
Formaldehyde is a prevalent organic solvent in industrial and indoor environment,which can seriously harm human health,so it is of great significance to develop highly sensitive formaldehyde sensors with fast response,low detection limit and long life.In this study,the NiO-In2O3 composite structure was prepared using indium-based metal organic framework(In-MOF)as the precursor,and the formaldehyde gas sensor was constructed with In2O3 and NiO-In2O3 composite structure as the sensitive material.The results demonstrated that the In2O3 material had a microflower-like structure,while the NiO-In2O3 composite structure was composed of NiO nanoparticles attached to the surface of In2O3.The sensor exhibited excellent detection performance for formaldehyde in the environment of relative humidity of 33%and 75%,especially the response characteristic of the NiO-In2O3 composite structure sensor to formaldehyde was considerably better than that of the In2O3 sensor under the same test conditions,which was closely related to the catalytic effect of NiO and the heterogeneous structure formed between NiO and In2O3.The NiO-In2O3 composite structure sensor had a response value of 21.3 and 12.6 to 10 μL/L formaldehyde when the relative humidity was 33%and 75%at 200℃.The response/recovery time was 4/6 s and 7/10 s,and the limit of detection(LOD)was 1.2×10-7 μL/L and 4.1×10-5 μL/L respectively.Meanwhile,the sensor had excellent selectivity and long-term stability.This sensor showed a wide application prospect in the field of high-performance detection of low concentration of formaldehyde gas.
罗翠线;侯娇红;贾文涛;王大铭;薛令荣
山西财经大学信息学院,太原 030006
金属有机框架氧化镍与氧化铟复合结构气体传感器甲醛检测
Metal organic frameworkNickel oxide and indium oxide composite structureGas sensorDetection of formaldehyde
《分析化学》 2024 (008)
1141-1151 / 11
国家自然科学基金项目(Nos.62105190,61903239)和山西省自然科学基金项目(Nos.20210302124559,202303021221185)资助. Supported by the National Natural Science Foundation of China(Nos.62105190,61903239)and the Natural Science Foundation of Shanxi Province,China(Nos.20210302124559,202303021221185).
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