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Abstract
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In this study, a novel gas sensor is proposed based on a three-dimensional Reduced Graphene
Oxide/Polyaniline (3D RGO/PANI) hybrid, which is synthesized by a hydrothermal method for
detecting NH3 gas at room temperature. The 3D RGO/PANI hybrid is characterized by field
emission-scanning electron microscopy, Fourier transform infrared and X-ray diffraction. The
specific surface area is analyzed using the Brunauer-Emmett-Teller (BET) equation. The assynthesized
sensing materials with an appropriate amount of polyaniline nanowires (PANI-NWs)
can effectively prevent aggregation of the neighboring graphene sheets and directly act as
adsorption sites for NH3 molecules. In comparison with its pure 3D RGO counterpart, the 3D
RGO/PANI (1:1) hybrid exhibits 44.7 times enhanced response to 100 ppm NH3, suggesting the
remarkable effect of PANI-NWs in improving the sensitivity. This work gives new insights into
boosting the sensitivity and selectivity of detecting NH3 gas by incorporating PANI-NWs into 3D
RGO.
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