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Research Letters in Nanotechnology
Volume 2009 (2009), Article ID 971423, 5 pages
Research Letter

Nanostructural Formation of Pd-Co Bimetallic Complex on HOPG Surfaces: XPS and AFM Studies

Department of Chemistry and Center for Advanced Nanoscale Materials, Institute for Functional Nanomaterials, University of Puerto Rico, Río Piedras Campus, P.O. Box 23346, San Juan, PR 00931-3346, USA

Received 18 October 2008; Accepted 28 January 2009

Academic Editor: John S. Foord

Copyright © 2009 Lisandra Arroyo-Ramírez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new single source approach was developed to synthesize Pd-Co nanoparticles using a bimetallic compound, [ E t 3 N H ] 2 [ C o P d 2 ( 𝜇 - 4 - I - 3 , 5 - M e 2 p z ) 4 C l 4 ] ( C o P d 2 ) , as a molecular precursor to obtain dispersed catalyst on highly ordered pyrolytic graphite (HOPG) surface, in view of preparing oxygen reduction catalysts for low temperature fuel cells. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) techniques were employed to characterize the nanostructure formations and to determine the composition and morphology of the complex on the HOPG. Results of high resolution XPS analysis (HR-XPS) revealed the binding energies corresponding to the atomic constituents of the precursor. When the precursor solution was placed on the surface of the HOPG, the bimetallic complex assumes a tubular structure and it appears that the surface of the HOPG offers a ground for the self-organization of nanostructural formations.