Characteristics of Hydrogen Sensor Based on Monolayer of Pt Nanoparticles Decorated on Single-Layer Graphene

We report the construction and testing of a resistive-type H2 sensor composed of a monolayer of platinum nanoparticles (Pt NPs) deposited using an immersion method on single-layer graphene. It was found that the Pt NP monolayer significantly reduced the response/recovery time of the graphene-based H2 sensor. The very rapid response of the sensor is attributed to the short diffusion length between the monolayer Pt nanoparticles and single-layer graphene. The sensor showed response time of 6 s and recovery time of 69 s at the optimal working temperature of 150°C. In addition, the fabricated device exhibited good repeatability at 10,000 ppm H2, detection range of 10 ppm to 10,000 ppm, and good thermal stability, satisfying the requirements for H2 sensors for safety applications.