Design and Fabrication of Ammonia Nano-Sensor by Aniline / Hydrazine Hydrate Reduced Graphene Oxide

In this research, the graphene-based sensors were designed to recognize the ammoniac gas, and the influence of Hydrazine and Aniline as reducing agents were investigated on the important characteristics of sensor. The synthesized graphene has been assessed by scanning electron microscope (SEM) and X-ray diffraction spectroscopy (XRD). The SEM micrographs showed that the reduced graphene sheets are in the shape of agglomerates with irregular geometry, which the changes during reduction process is obtainable. The broad and flat peak was observed in XRD spectrum, confirming the randomize and irregular orientation graphene sheets on each others, and their fully delamination. The evaluation of the both of the graphene-based sensors, reduced by Hydrazine and Aniline indicated that the fabricated sensor by Aniline presents a better performance by maximum relative resistance change (S) of 38% and response time (Rt) of 7.6 min at 5 ppm of ammoniac gas. This study was succeeded to improve the sensitivity of the ammoniac gas detection sensor more than 48% (sensitivity=6.7%/ppm) by utilization of Aniline as reducer for the cocentrations less than 10 ppm, compared to the ideal graphene-based sensor.