▎ 摘　　要

A Pt-functionalized graphene (PFG) was prepared, whose hydrogen gas sensing behaviors were studied within the hydrogen concentration range from 1 x 10(2) to 1 x 10(4) ppm. The results indicated that resistance of the as-prepared PFG increased with hydrogen at room temperature and 40 degrees C. On the contrary, the PFG showed decrease in resistance when it interacted with 10,000 ppm of H-2 at 65 degrees C, or with 500 ppm of H-2 at 105 degrees C. A model based on the ambipolarity of graphene was suggested to explain these phenomena. (C) 2013 Elsevier B.V. All rights reserved.