Highly responsive hydrogen sensor based on Pd nanoparticle-decorated transfer-free 3D graphene

H₂ sensors play a crucial role in the development of hydrogen (H₂) energy and safety monitoring. Therefore, efficiently and rapidly detecting low concentrations of H₂ is a fundamental challenge that needs to be addressed in the field of H₂ sensors. In this study, we present a highly sensitive H₂ gas sensor based on Pd-nanoparticles (NPs)-decorated transfer-free three-dimensional (3D) graphene. 3D graphene provides an increased surface area for enhanced gas adsorption and reaction kinetics. The integration of PdNPs improved the electron transport properties, resulting in a higher sensitivity. The PdNP-decorated 3D graphene sensor exhibited a remarkable gas response of 41.9% under 3% H₂ exposure. The transfer-free synthesis process ensures the excellent conductivity of 3D graphene to further enhance its overall sensing performance. These discoveries propel current gas-sensing technologies forward and introduce fresh opportunities for the development of dependable sensors that can effectively enhance industrial safety and public security.