Authors: Dongzhi Zhang Hongyan Chang Runhua Liu
Publish Date: 2016/05/19
Volume: 45, Issue: 8, Pages: 4275-4281
Abstract
This paper demonstrates the onestep hydrothermal synthesis of a tin dioxide SnO2decorated reduced graphene oxide RGO hybrid nanocomposite which was dropcasted on a polyimide substrate as a humidity sensor The assynthesized hybrid was characterized in terms of its nanostructural morphological and compositional features by SEM XRD and nitrogen sorption The humidity sensing properties of the presented RGO/SnO2 hybrid nanocomposite such as repeatability stability responserecovery characteristics were investigated by exposing it to a broad humidity range of 11–97 RH at room temperature As a result the sensor demonstrated a high sensitivity a good repeatability an acceptable linearity a fast response/recovery characteristic and high longterm stability over a full humidity range measurement indicating the unique advantages of onestep hydrothermal synthesis for sensor fabrication The possible and proposed sensing mechanism for the sensor is mainly attributed to a humidityinduced transfer of charge carriers occuring at the interfaces and the swelling effect of RGO
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