Abstract
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 30nm 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 (H2) detection material and it showed noteworthy advantages such as large detectable-range of 1 to 40,000ppm, high-response magnitude, and fast-response/recovery time. A maximum response of 36% and a response/recovery time of 3/1.2min were observed for 10,000ppm (1%) hydrogen concentration at room temperature (20°C). The fabricated sensor also exhibits a good reliability within the entire detection range.
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