AVS 62nd International Symposium & Exhibition
    2D Materials Focus Topic Friday Sessions
       Session 2D+EM+IS+NS+PS+SP+SS-FrM

Paper 2D+EM+IS+NS+PS+SP+SS-FrM7
Spontaneous Deposition of Palladium Nanoparticles on Graphene through Redox Reaction

Friday, October 23, 2015, 10:20 am, Room 212C

Session: Surface Chemistry of 2D Materials: Functionalization, Membranes, Sensors
Presenter: Xiaorui Zhang, University of Tsukuba, Japan
Authors: X.R. Zhang, University of Tsukuba, Japan
W. Ooki, University of Tsukuba, Japan
Y.R. Kosaka, University of Tsukuba, Japan
T. Kondo, University of Tsukuba, Japan
J. Nakamura, University of Tsukuba, Japan
Correspondent: Click to Email
Due to its unique properties such as huge surface area and excellent conductivity, graphene becomes great interesting for supporting noble metal catalysts. Some noble metals such as palladium, platinum, gold nanoparticles was reported to be able to spontaneous deposition on as-synthesized reduced graphene oxide with external reducing agent-free recently. Yet the mechanism of spontaneous deposition of metals on graphene has not been clarified until now. In the present research, we spontaneously deposited palladium nanoparticles on as-synthesized reduced graphene oxide in H2O medium without external reducing agent. It was found that the deposited amount of palladium varied with pH, meanwhile, the bivalent Pd2+ precursor was reduced to metallic palladium, and graphene was oxidized simultaneously with an increasing of its oxygen functional groups. The atomic ratio of the deposited Pd and the increased O in rGO located in a range from 1 to 2. As reducing agent-free, the mechanism on spontaneous redox deposition of metal nanoparticles on graphene was proposed, firstly, an efficient adsorption of metal precursor on graphene is a prerequisite which is determined by their electrical charges and adjusted by pH. Secondly, a positive galvanic potential between metal precursor and graphene is necessary for metal spontaneous deposition.