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Reduced Graphene Oxide (RGO) is an electronically hybrid material that displays remarkable chemical sensing properties. Presented herein is a quantitative analysis of the chemical gating effects in RGO-based chemical sensors. The gas sensing devices are patterned in a field-effect transistor geometry, by dielectrophoretic assembly of RGO platelets between gold electrodes deposited on silicon wafers. ... read moreThese sensors demonstrate highly selective and reversible responses to the measured analytes, as well as quick response and recovery times. In order to gain a deeper understanding of the doping mechanism, a combined electronic transport and Kelvin Probe Microscopy experimental technique is employed to quantify the amount of charge transferred to RGO due to chemical doping when the device is exposed to several different analytes. We demonstrate that this method allows us to obtain high-resolution maps of the surface potential and local charge distribution both before and after chemical doping, to identify local gate-susceptible areas on the RGO surface, and to directly extract the contact resistance between the RGO and the metallic electrodes. The method presented is general, suggesting that these results have important implications for building graphene and other nanomaterial-based chemical sensors.read less
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