▎ 摘　　要

Graphene-supported platinum/palladium (Pt/Pd) core-shells hybrid was synthesized via a simple chemical method to exploit as a novel hydrogen detection nanomaterial. Pt/Pd core-shell was synthesized by a two-step chemical route (seed-mediated growth) with a polymer-assisted growth process. Highly uniformed colloidal Pd nanocubes with a size of 30 nm were used as core, and the thin layer of Pt was coated outside the Pd core as shell. Subsequently, the Pt/Pd core-shell was simply decorated onto the graphene flakes by hydrazine in a facile one-step reaction. The resultant Pt/Pd core-shell-graphene (core-shell-Gr) hybrid was applied as a new hydrogen (H-2) detection material and it showed noteworthy advantages such as large detectable-range of 1 to 40,000 ppm, high-response magnitude, and fast-response/recovery time. A maximum response of 36% and a response/recovery time of 311.2 min were observed for 10,000 ppm (1%) hydrogen concentration at room temperature (20 degrees C). The fabricated sensor also exhibits a good reliability within the entire detection range. (C) 2015 Elsevier B.V. All rights reserved.