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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.
Highlights
The demand for highly sensitive sensors featuring selectivity toward specific gases in various applications, such as industrial process control, environment protection, food safety, healthcare, and Sensors 2015, 15 security, has increased
This study focused on Cu2+/PANI/WO3-nanocomposite-coated surface acoustic wave (SAW) sensors featuring sensitivity and selectivity toward Nitric oxide (NO) in the parts-per-billion range at room temperature in dry nitrogen
This negative frequency shift was accompanied by an increase in attenuation caused by mass loading on the SAW device
Summary
The demand for highly sensitive sensors featuring selectivity toward specific gases in various applications, such as industrial process control, environment protection, food safety, healthcare, and Sensors 2015, 15 security, has increased. Metal oxides are effective materials applied in parts-per-billion-level NO detection. Among these materials, WO3, ZnO, and SnO2 are often applied in NOx sensing [2,12,13,14]. To increase the sensitivity and lower the detection limit, selective reductive catalysts were introduced Numerous transition metals, such as Fe, V, Cr, and Cu, exhibit low-temperature catalytic activity [16], and copper is among the most typical catalysts applied in selective catalytic reduction reactions. This study focused on Cu2+/PANI/WO3-nanocomposite-coated surface acoustic wave (SAW) sensors featuring sensitivity and selectivity toward NO in the parts-per-billion range at room temperature in dry nitrogen. This study investigated the detection properties of a sensor by analyzing SAW responses
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