HYDROGEN SENSOR BASED ON PLATINUM/PALLADIUM CORE-SHELL GRAPHENE HYBRID, AND PRODUCTION METHOD THEREFOR

摘要

The present invention relates to a hydrogen sensor based on a platinum/palladium core-shell graphene hybrid and a production method therefor, wherein graphene supported by platinum /palladium (Pt/Pd) cores/shells is synthesized by a simple chemical means for use as a new nanomaterial for hydrogen detection. The Pt/Pd cores/shells are synthesized by a two-step chemical route (seed-mediated growth) and a polymer-assisted growth process. Very uniform colloidal palladium (Pd) nanocubes in the size of 30 nm are used as the cores, and the outside of each Pd core is coated with a thin platinum (Pt) layer as the shell, wherein the Pt/Pd cores/shells are simply decorated onto graphene flakes by hydrazine (a reducing agent) in an easy one-step reaction. The resulting Pt/Pd core-shell graphene hybrid is applied as a new material for hydrogen detection owing to the advantage of having a wide detection range, high sensitivity, and a short reaction/recovery time. A resistive sensor using the Pt/Pd core-shell graphene hybrid has a detection range of 40,000 to 1 ppm certainly reliably at room temperature. The hydrogen sensor has a great reaction value of 36% and measures a reaction/recovery time of 3/1.2 minutes with a hydrogen concentration of 1% at room temperature.