Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films

Li, Hui, Li, Min, Kan, Hao, Li, Chong, Quan, Aojie, Fu, Chen, Luo, Jingting, Liu, Xueli, Wang, Wen, Yang, Zhengbao, Wei, Qiuping and Fu, Yong Qing (2019) Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films. Surface and Coatings Technology, 362. pp. 78-83. ISSN 0257-8972

Text (Full text) Li et al - Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films AAM.docx - Accepted Version Download (2MB)

Abstract

Colloidal quantum dots (CQDs) have shown their advantages in gas-sensing applications due to their extremely small particle size and facile solution based processes. In this study, a high sensitivity of surface acoustic wave (SAW) NO2 sensor was demonstrated using SnS CQDs as the sensing layer. The delay line based SAW device with a resonant frequency of 200 MHz were fabricated on ST-cut quartz substrate. The SnS CQDs with average sizes of 5.0 nm were synthesized and deposited onto SAW sensors using a spin-coating method. The fabricated SAW sensor was capable of detecting a low concentration of NO2 gas at room temperature with a good efficiency and selectivity e.g., with a 1.8 kHz decrease of center frequency of the SAW delay line when exposed to 10 ppm NO2 at room temperature.

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