Abstract
We have fabricated a real-time graphene field effect transistor (GFET) for monitoring free chlorine concentration. A monolayer graphene was grown by low-pressure chemical vapor deposition (LP-CVD) on Cu foil and then transferred to silicon substrate to be a sensing material of GFET. The source and drain electrodes of GFET were Au/Cr, while gate electrode was Ag/AgCl. Free chlorine concentrations (0 to 29.93 ppm) were diluted from sodium hypochlorite (NaClO) in phosphate buffered saline (PBS) solution. The current-voltage (I-V) characteristic measurements from GFET show results that relative responding of the current in the range from 0 to 3 ppm of free chlorine concentrations. Our GFET shows possibility for multiple use which is suitable for the real-time free chlorine monitoring system especially in drinking water.
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