Hydrogen Sensing Characteristics of Gas Sensor Based on Pt/Graphene Composite

Abstract

Graphene has exceptional electrical, optical and thermal properties, and is widely used to create thinner, lighter and faster sensors. In this study, graphene was fabricated by mechanically exfoliating on the Si O2/Si substrate and the graphene field effect transistor(FET) was prepared by photolithography. Platinum(Pt) particles were doped on the surface of graphene by the hydrazine hydrate reduction method to endow a Pt/graphene sensor with gas-sensing properties. By being tested on a gas detection platform, the characteristics of the electrical(I-V) curves and resistance response curves were obtained in different hydrogen environments. The results show that the Pt/graphene sensor exhibits a high sensitivity to hydrogen at room temperature, with a resistance response rate of 33. 35% at a hydrogen volume fraction of 1. 00%. However, the sensitivity lifetime study shows an essential hysteresis in desorption process, which leads to gradually decreases in the resistance response rate. This research provides an improved production method of graphene-based gas sensors, which has a wide range of potential applications in aero-space industry.

Keywords

graphene / platinum(Pt) particle / hydrogen sensor / chemical adsorption

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Funding

National Natural Science Foundation of China(51905090)