Fabrication of a SnO2-Based Acetone Gas Sensor Enhanced by Molecular Imprinting

Sensors

Wenhu Tan¹  Xiaofan Ruan¹  Qiuxiang Yu¹  Zetai Yu¹ 

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

关键词: SnO₂;    molecular imprinting;    acetone gas sensor;    clusters;    ¹⁷O-NMR;   

DOI  :  10.3390/s150100352

来源: mdpi

【 摘 要 】

This work presents a new route to design a highly sensitive SnO₂–based sensor for acetone gas enhanced by the molecular imprinting technique. Unassisted and acetone-assisted thermal synthesis methods are used to synthesis SnO₂ nanomaterials. The prepared SnO₂ nanomaterials have been characterized by X-ray powder diffraction, scanning electron microscopy and N₂ adsorption−desorption. Four types of SnO₂ films were obtained by mixing pure deionized water and liquid acetone with the two types of as-prepared powders, respectively. The acetone gas sensing properties of sensors coated by these films were evaluated. Testing results reveal that the sensor coated by the film fabricated by mixing liquid acetone with the SnO₂ nanomaterial synthesized by the acetone-assisted thermal method exhibits the best acetone gas sensing performance. The sensor is optimized for the smooth adsorption and desorption of acetone gas thanks to the participation of acetone both in the procedure of synthesis of the SnO₂ nanomaterial and the device fabrication, which results in a distinct response–recovery behavior.

【 授权许可】

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