Room temperature-based hydrogen gas sensing over Laser-Induced Graphene electrode supported Pt nanoparticles for low LOD

Abstract

This study introduces a novel hydrogen sensor that operates efficiently at room temperature with high sensitivity and selectivity. This sensor was created by utilizing a platinum on laser-induced graphene (Pt/LIG) structure. The synthesis process involves the creation of highly crystalline graphene with a large surface area, which serves as an optimal support for nanosized pt catalysts. Post-synthesized Pt nanoparticles were dispersed on the surface of the LIG electrode and envisaged for the hydrogen gas sensing property under ambient conditions without a heating or sensor device. Analysis showed that the Pt nanoparticles are uniquely characterized by their narrow size distribution of less than 5 nm and their homogeneous deposition on the LIG substrate, which itself exhibits a substantial specific surface area of 187.4 m²/g. This configuration enables the sensor to achieve a very low limit for detection of hydrogen to 200 ppb. Moreover, the sensor demonstrates exceptional performance attributes, including high sensitivity, excellent linearity, and remarkable cycle stability over 50 cycles. The synergy between the high surface area of the LIG and the catalytic activity of the Pt nanoparticles facilitates the detection of hydrogen at room temperature. This study contributes significantly to the field of gas sensing technology, particularly in applications requiring accurate and reliable hydrogen detection at ambient conditions.