Signal-to-Noise Enhancement of a Nanospring Redox-Based Sensor by Lock-in Amplification

Abstract

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.

DOI: 10.3390/s150613110

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Cite this paper

@inproceedings{Bakharev2015SignaltoNoiseEO, title={Signal-to-Noise Enhancement of a Nanospring Redox-Based Sensor by Lock-in Amplification}, author={Pavel V. Bakharev and David N. McIlroy}, booktitle={Sensors}, year={2015} }