期刊
SURFACE & COATINGS TECHNOLOGY
卷 362, 期 -, 页码 78-83出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2019.01.100
关键词
Colloidal quantum dots; Surface acoustic wave; Gas sensor; Nitrogen oxide; Tin sulfide
资金
- Research and Development Program of China [2016YFB0402705]
- National Natural Science Foundation of China [11704261, 11575118]
- Shenzhen Science & Technology Project [JCYJ20170817100658231, JCYJ20160414102255597]
- Natural Science Foundation of SZU [2017067]
- Shenzhen Key Lab Fund [ZDSYS20170228105421966]
- PhD Start-up Fund of Natural Science Foundation of Guangdong Province, China [2017A030310375]
- UK Engineering and Physical Sciences Research Council (EPSRC) under Newton Mobility Grant through Royal Society [EP/P018998/1, IE161019]
- National Natural Science Foundation of China
- Royal academy of Engineering UK
- EPSRC [EP/P018998/1] Funding Source: UKRI
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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