1. Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films
- Author
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Li, Hui, Li, Min, Kan, Hao, Li, Chong, Quan, Aojie, Fu, Chen, Luo, Jingting, Liu, Xueli, Wang, Wen, Yang, Zhengbao, Wei, Qiuping, Fu, Yongqing, Li, Hui, Li, Min, Kan, Hao, Li, Chong, Quan, Aojie, Fu, Chen, Luo, Jingting, Liu, Xueli, Wang, Wen, Yang, Zhengbao, Wei, Qiuping, and Fu, Yongqing
- 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) NO 2 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 NO 2 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 NO 2 at room temperature. © 2019
- Published
- 2019