Humidity Sensing by Chemically Reduced Graphene Oxide
Reduced Graphene Oxide (RGO) has been synthesized chemically by reducing micron-sized Graphene Oxide (GO) flakes using sodium borohydride solution. Indium Tin Oxide (ITO) coated glass was taken as the basic substrate for sensing layer deposition. Sensitivity tests for relative humidity (RH) measurements were carried out at five different concentrations of humid air at room temperature. The response of the sensor was found to vary between 3.8 for 10 % humid air and 20.4 for 100 % humid air. Characterizations of the sensing layer were carried out using Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscopy (FESEM).
KeywordsGraphene sensor Relative humidity sensor Room temperature sensor
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S. Santra acknowledges Department of Science and Technology (DST), India for the partial support of the work (project no SR/S2/RJN-104/2011).
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