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Chemical nanodevices based on tin dioxide, graphene and a mixture of both materials were developed and characterized for NO<sub>2</sub> detection at low concentrations. The chemiresistors were prepared by both electrospinning and drop casting. The films morphologies were investigated by scanning electron microscopy (SEM). The devices response to sub-ppm NO<sub>2</sub> concentrations was measured from room temperature up to 300 °C. An improvement in the performance in terms of sensitivity and response time, as well as higher responses at room temperature, was obtained when a mixture of these materials is used

Tin Dioxide-Graphene Based Chemi-Device for NO2 Detection in the Sub ppm Range