Chemically Reduced Graphene Oxide for Ammonia Detection
at Room Temperature
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Abstract
Chemically reduced graphene oxide
(RGO) has recently attracted growing interest in the area of chemical
sensors because of its high electrical conductivity and chemically
active defect sites. This paper reports the synthesis of chemically
reduced GO using NaBH<sub>4</sub> and its performance for ammonia
detection at room temperature. The sensing layer was synthesized on
a ceramic substrate containing platinum electrodes. The effect of
the reduction time of graphene oxide (GO) was explored to optimize
the response, recovery, and response time. The RGO film was characterized
electrically and also with atomic force microscopy and X-ray photoelectron
spectroscopy. The sensor response was found to lie between 5.5% at
200 ppm (parts per million) and 23% at 2800 ppm of ammonia, and also
resistance recovered quickly without any application of heat (for
lower concentrations of ammonia). The sensor was exposed to different
vapors and found to be selective toward ammonia. We believe such chemically
reduced GO could potentially be used to manufacture a new generation
of low-power portable ammonia sensors