摘要
This paper reports an improved TiO2 based vapor sensor fabricated by dielectrophoretically assembling TiO2 nanowires. With incorporating a parallel laminar flow field with AC electric fields, the dielectrophosis of TiO2 nanowires in ethanol was systematically studied at varied AC frequencies and flow rates. With the aid of UV light, the developed vapor nanosensors can detect vapor pollutants including NH3, acetone and ethanol at room temperature. The detection limit, the response time, and the recovery time of the developed vapor nanosensors are 10 ppm, 120 seconds, and 60 seconds, respectively.