Poly4-vinylphenol （P4VP）/multi-wall carbon nanotubes（MWNTs） multi-layer sensitive films were deposited on interdigitated electrodes by airbrush technology to detect toluene vapor at room temperature.The surface and section morphologies of the multi-layer films were observed by a scanning electron microscope（SEM）.It is found that the resistance of the sensor increases when it is exposed to toluene vapor and the response has a good linearity with the concentration of toluene.The results show that the P4VP/MWNTs three-layer film sensors have better sensing properties compared with the two-layer film sensors.The related sensing mechanism is studied in detail.
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