SURFACE & COATINGS TECHNOLOGY | 卷:362 |
Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films | |
Article | |
Li, Hui1  Li, Min1,2  Kan, Hao1,2  Li, Chong1  Quan, Aojie1  Fu, Chen1  Luo, Jingting1  Liu, Xueli3  Wang, Wen3  Yang, Zhengbao4  Wei, Qiuping5  Fu, Yongqing6  | |
[1] Shenzhen Univ, Coll Phys & Energy, Shenzhen Key Lab Adv Thin Films & Applicat, Shenzhen 518060, Peoples R China | |
[2] Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Coll Optoelect Engn, Shenzhen 518060, Peoples R China | |
[3] Chinese Acad Sci, Inst Acoust, Beijing 100190, Peoples R China | |
[4] City Univ Hong Kong, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China | |
[5] Cent S Univ, Sch Mat Sci & Engn, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China | |
[6] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England | |
关键词: Colloidal quantum dots; Surface acoustic wave; Gas sensor; Nitrogen oxide; Tin sulfide; | |
DOI : 10.1016/j.surfcoat.2019.01.100 | |
来源: Elsevier | |
【 摘 要 】
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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