SnO2 Highly Sensitive CO Gas Sensor Based on Quasi-Molecular-Imprinting Mechanism Design

Sensors

Chenjia Li¹  Meng Lv¹  Jialin Zuo¹ 

[1] Institute of Nanoscience and Nanotechnology, Department of Physical Science and Technology, Central China Normal University, Wuhan 430079, China;

关键词: SnO₂ nanomaterial;    molecular imprinting mechanism;    CO gas sensor;    high sensitivity;   

DOI  :  10.3390/s150203789

来源: mdpi

【 摘 要 】

Response of highly sensitive SnO₂ semiconductor carbon monoxide (CO) gas sensors based on target gas CO quasi-molecular-imprinting mechanism design is investigated with gas concentrations varied from 50 to 3000 ppm. SnO₂ nanoparticles prepared via hydrothermal method and gas sensor film devices S_C (exposed to the target gas CO for 12 h after the suspension coating of SnO₂ film to be fully dried, design of quasi-molecular-imprinting mechanism, the experiment group) and S_A (exposed to air after the suspension coating of SnO₂ film to be fully dried, the comparison group) made from SnO₂ nanoparticles are all characterized by XRD, SEM and BET surface area techniques, respectively. The gas response experimental results reveal that the sensor S_C demonstrates quicker response and higher sensitivity than the sensor S_A does. The results suggest that in addition to the transformation of gas sensor materials, surface area, and porous membrane devices, the Molecular Imprinting Theory is proved to be another way to promote the performance of gas sensors.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.