期刊
SENSORS
卷 15, 期 6, 页码 13110-13120出版社
MDPI
DOI: 10.3390/s150613110
关键词
MOS; gas sensor; ZnO; lock-in amplifier
资金
- Office of Naval Research [N00014-10-1-0282]
- USDA
- Dyess Faculty Fellowship
A significant improvement of the response characteristics of a redox chemical gas sensor (chemiresistor) constructed with a single ZnO coated silica nanospring has been achieved with the technique of lock-in signal amplification. The comparison of DC and analog lock-in amplifier (LIA) AC measurements of the electrical sensor response to toluene vapor, at the ppm level, has been conducted. When operated in the DC detection mode, the sensor exhibits a relatively high sensitivity to the analyte vapor, as well as a low detection limit at the 10 ppm level. However, at 10 ppm the signal-to-noise ratio is 5 dB, which is less than desirable. When operated in the analog LIA mode, the signal-to-noise ratio at 10 ppm increases by 30 dB and extends the detection limit to the ppb range.
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