The synthesis of noble metals (e.g. Pd, Pt, Au, Ag etc.) nanoparticles with controlled atomic distributions have attracted significant interest due to their size-tunable properties depending up on the variation of composition and structure. Recently, various researchers have been focused on fabrication of tri- and multi-metallic nanoparticle catalysts due to their tunable properties implemented in diverse potential applications. The addition of a third metal in to the nanoparticle catalyst is expected to produce a combination of effects such as modification of the electronic structure, change in the d-band center, reduction of the lattice distance and enhances the overall electronic charge shift. Therefore, tri- and multi-metallic nanoparticles possess the higher catalytic activity and selectivity in comparison to mono- and bi-metallic counterparts. Controlling the morphology of nanostructures can provide a great opportunity to stimulate their possible applications such as catalytic, electronic, sensing, and optical properties and to enhance their reactivity, selectivity and stability. The fabrication of AgPd/Pt trimetallic nanocrystals with multiply twinned structures, possessing the icosahedra morphology with a high density of compressed twins and high fraction of Pt atoms on the (111) surfaces are expected to be the most active catalysts for their many applications in fuel cells [1-5].  [1] N. Toshima et al., Cata. Today,  2007 , 122, 239-244[2] S. H. Tsai et al., J. Mater. Chem. 2003 , 13, 978-980[3] S. Khanal et al., Nanoscale, 2013 [4] J. Yang, J et al., ACS Nano, 2012 , 6, 9373.[5] Acknowledgments: The authors would like to acknowledge NSF grants DMR-1103730, �Alloys at the Nanoscale: The Case of Nanoparticles Second Phase� and NSF PREM Grant # DMR 0934218

Preparation of novel AgPd/Pt trimetallic multiply twinned particles and their atomic resolution images by Cs-corrected STEM

247th National Meeting (2014)

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