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Sensors 2015, 15(6), 13110-13120;

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

Department of Physics, University of Idaho, Moscow, ID 83844, USA
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 27 April 2015 / Revised: 1 June 2015 / Accepted: 2 June 2015 / Published: 4 June 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
Full-Text   |   PDF [1840 KB, uploaded 4 June 2015]   |  


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. View Full-Text
Keywords: MOS; gas sensor; ZnO; lock-in amplifier MOS; gas sensor; ZnO; lock-in amplifier

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Bakharev, P.V.; McIlroy, D.N. Signal-to-Noise Enhancement of a Nanospring Redox-Based Sensor by Lock-in Amplification. Sensors 2015, 15, 13110-13120.

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