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

Hui Li; Min Li; Hao Kan; Chong Li; Aojie Quan; Chen Fu; Jingting Luo; Xueli Liu; Wen Wang; Zhengbao Yang; Qiuping Wei; Yongqing Fu

doi:10.1016/j.surfcoat.2019.01.100

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

Hui Li, Min Li, Hao Kan, Chong Li, Aojie Quan, Chen Fu, Jingting Luo^*, Xueli Liu, Wen Wang^*, Zhengbao Yang, Qiuping Wei, Yongqing Fu

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

54 Citations (Scopus)

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.

Original language	English
Pages (from-to)	78-83
Journal	Surface and Coatings Technology
Volume	362
Online published	28 Jan 2019
DOIs	https://doi.org/10.1016/j.surfcoat.2019.01.100
Publication status	Published - 25 Mar 2019

Research Keywords

Colloidal quantum dots
Gas sensor
Nitrogen oxide
Surface acoustic wave
Tin sulfide

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10.1016/j.surfcoat.2019.01.100

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Cite this

@article{b6adfd7f02e34702b0d2a89c9c371c34,

title = "Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films",

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.",

keywords = "Colloidal quantum dots, Gas sensor, Nitrogen oxide, Surface acoustic wave, Tin sulfide",

author = "Hui Li and Min Li and Hao Kan and Chong Li and Aojie Quan and Chen Fu and Jingting Luo and Xueli Liu and Wen Wang and Zhengbao Yang and Qiuping Wei and Yongqing Fu",

year = "2019",

month = mar,

day = "25",

doi = "10.1016/j.surfcoat.2019.01.100",

language = "English",

volume = "362",

pages = "78--83",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films

AU - Li, Hui

AU - Li, Min

AU - Kan, Hao

AU - Li, Chong

AU - Quan, Aojie

AU - Fu, Chen

AU - Luo, Jingting

AU - Liu, Xueli

AU - Wang, Wen

AU - Yang, Zhengbao

AU - Wei, Qiuping

AU - Fu, Yongqing

PY - 2019/3/25

Y1 - 2019/3/25

N2 - 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.

AB - 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.

KW - Colloidal quantum dots

KW - Gas sensor

KW - Nitrogen oxide

KW - Surface acoustic wave

KW - Tin sulfide

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U2 - 10.1016/j.surfcoat.2019.01.100

DO - 10.1016/j.surfcoat.2019.01.100

M3 - RGC 21 - Publication in refereed journal

SN - 0257-8972

VL - 362

SP - 78

EP - 83

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

ER -