This study developed a facile technique for site‐specific synthesis of nanometer‐thick polyaniline (PANI) film for fabrication of field‐effect transistor/chemiresistor sensors. The nanothin film had a thickness of 9–20 nm and was of carpet‐like morphology offering a highly accessible surface geometry that enhanced gas adsorption and promoted surface reaction/interaction. When applied for sensing of ammonia (NH3) and nitrogen dioxide (NO2), the performance of the nanothin film device was comparable to that of a 1‐dimensional (1‐D) nanostructure, with a great advantage in ease of processing. Sensing mechanism study indicated electrostatic gating as the dominating mode of sensing.
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Srinives et al. (2013) studied this question.
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