Abstract
A copper ion-doped polyaniline/tin oxide nanocomposited film, Cu2+/PANI/SnO2, was investigated on a Rayleigh surface acoustic wave device for nitric oxide (NO) gas sensing at room temperature. The surface morphology, chemical structures and the electric properties were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Hall Effect measurement, respectively. Copper ion-doped sensing film, Cu2+/PANI/SnO2, exhibited high NO gas sensitivity, repeatability and long-term stability. Moreover, it showed an estimated detection limit of 5ppb. The sensor exhibited distinctive selectivity towards NO gas with no significant response to NO2, CO2 and O2 gases.
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