Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Nanocrystal and surface alloy properties of bimetallic Gold-Platinum nanoparticles | Nanoscale Res Lett 2007 2 12-16 DOI S11671-006-9022-8 NANO EXPRESS Nanocrystal and surface alloy properties of bimetallic Gold-Platinum nanoparticles Derrick Mott Jin Luo Andrew Smith Peter N. Njoki Lingyan Wang Chuan-Jian Zhong Published online 30 November 2006 to the authors 2006 Abstract We report on the correlation between the nanocrystal and surface alloy properties with the bimetallic composition of gold-platinum AuPt nanoparticles. The fundamental understanding of whether the AuPt nanocrystal core is alloyed or phase-segregated and how the surface binding properties are correlated with the nanoscale bimetallic properties is important not only for the exploitation of catalytic activity of the nanoscale bimetallic catalysts but also to the general exploration of the surface or interfacial reactivities of bimetallic or multimetallic nanoparticles. The AuPt nanoparticles are shown to exhibit not only single-phase alloy character in the nanocrystal but also bimetallic alloy property on the surface. The nanocrystal and surface alloy properties are directly correlated with the bimetallic composition. The FTIR probing of CO adsorption on the bimetallic nanoparticles supported on silica reveals that the surface binding sites are dependent on the bimetallic composition. The analysis of this dependence further led to the conclusion that the relative Au-atop and Pt-atop sites for the linear CO adsorption on the nanoparticle surface are not only correlated with the bimetallic composition but also with the electronic effect as a result of the d-band shift of Pt in the bimetallic nanocrystals which is the first demonstration of the Electronic Supplementary Material Supplementary material is available to authorised users in the online version of this article at http s11671-006-9022-8 D. Mott J. Luo A. Smith P. N. Njoki L. Wang . Zhong El Department of Chemistry State University of New York at Binghamton Binghamton New York 13902 USA e-mail .
