Interfacial Charge Transfer Mechanism in rGO‐CuO Nanocomposite for Enhanced Room‐Temperature Ammonia Sensing
Priya A. Patil, Paresh S. Gaikar, Shaheen A. Shaikh, Ravindra N. Bulakhe, Ji Man Kim, Rajaram S. Mane, Balasaheb D. AghavABSTRACT
In this work, a reduced graphene oxide‐copper oxide (rGO‐CuO) nanocomposite sensor, synthesized using a modified Hummer's method, is envisaged for ammonia (NH 3 ) sensing activity at room temperature (25°C). The structural and morphological, as well as compositional, characteristics of the rGO and rGO‐CuO composite sensors are thoroughly investigated through various sophisticated physical and chemical measurement techniques. The rGO‐CuO composite sensor is very sensitive and selective to NH 3 with a highest response of 99.18% at 100 ppm and 17.9% at 1 ppm, respectively. At room temperature, the limit of detection is 0.25 ppm. The enhanced sensing performance is attributed to the synergistic interaction between CuO and rGO, which facilitates the efficient charge transport and increased active sites for gas adsorption. These results demonstrate that the rGO‐CuO nanocomposite is a promising candidate for efficient room‐temperature ammonia sensing with potential applications in environmental monitoring and industrial safety.