期刊论文详细信息
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
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【 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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