In this paper, gas sensing properties of the sensor based on titanium dioxide (TiO 2 ) nanofibres are reported. These nanofibres were synthesized through electrospinning of polyvinyl pyrrolidone (PVP) / titanium tetra isopropoxide. Calcination of the obtained amorphous PVP/TiO 2 nanofibres resulted in nanofibres of TiO 2 with the same morphology. In this step, scanning electron microscopy and X-ray diffraction were applied in order to analyse these nanofibres. Then, nanofibres of TiO 2 were deposited selectively by AC electrophoretic deposition on interdigitated electrodes and exposed to different concentrations of NO 2 (8-50 p.p.m.) at 450-550 • C. Gas sensing measurements illustrated that this sensor had adequate response to target gas at 450 • C. The maximum response of gas sensors, S (the ratio of sensor resistances S = R gas /R N2 ), achieved was around 30 for 50 p.p.m. NO 2 at 450 • C.
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