Preparation of Metal Organic Framework-derived Microflower-Like NiO-In2O3 Composite Structure and Its Detection Performance for Ultra-Low Concentration of Formaldehyde Gas
10.19756/j.issn.0253-3820.231380
- VernacularTitle: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
- Author:
Cui-Xian LUO
1
;
Jiao-Hong HOU
;
Wen-Tao JIA
;
Da-Ming WANG
;
Ling-Rong XUE
Author Information
1. 山西财经大学信息学院,太原 030006
- Keywords:
Metal organic framework;
Nickel oxide and indium oxide composite structure;
Gas sensor;
Detection of formaldehyde
- From:
Chinese Journal of Analytical Chemistry
2024;52(8):1141-1151
- CountryChina
- Language:Chinese
-
Abstract:
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.
