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Sensors 2015, 15(4), 7084-7095; doi:10.3390/s150407084

A Room Temperature Nitric Oxide Gas Sensor Based on a Copper-Ion-Doped Polyaniline/Tungsten Oxide Nanocomposite

1
Department of Chemical Engineering, I-Shou University, Kaohsiung 84001, Taiwan
2
Department of Electrical Engineering, I-Shou University, Kaohsiung 84001, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Gerhard Lindner
Received: 5 December 2014 / Accepted: 16 March 2015 / Published: 24 March 2015
(This article belongs to the Special Issue Acoustic Waveguide Sensors)
View Full-Text   |   Download PDF [1626 KB, uploaded 24 March 2015]   |  

Abstract

The parts-per-billion-level nitric oxide (NO) gas sensing capability of a copper-ion-doped polyaniline/tungsten oxide nanocomposite (Cu2+/PANI/WO3) film coated on a Rayleigh surface acoustic wave device was investigated. The sensor developed in this study was sensitive to NO gas at room temperature in dry nitrogen. The surface morphology, dopant distribution, and electric properties were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy mapping, and Hall effect measurements, respectively. The Cu2+/PANI/WO3 film exhibited high NO gas sensitivity and selectivity as well as long-term stability. At 1 ppb of NO, a signal with a frequency shift of 4.3 ppm and a signal-to-noise ratio of 17 was observed. The sensor exhibited distinct selectivity toward NO gas with no substantial response to O2, NH3 and CO2 gases. View Full-Text
Keywords: copper-ion-doped polyaniline/tungsten oxide nanocomposite; nitric oxide (NO); gas sensor; Rayleigh surface acoustic wave (SAW) copper-ion-doped polyaniline/tungsten oxide nanocomposite; nitric oxide (NO); gas sensor; Rayleigh surface acoustic wave (SAW)
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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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MDPI and ACS Style

Wang, S.-H.; Shen, C.-Y.; Su, J.-M.; Chang, S.-W. A Room Temperature Nitric Oxide Gas Sensor Based on a Copper-Ion-Doped Polyaniline/Tungsten Oxide Nanocomposite. Sensors 2015, 15, 7084-7095.

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