AVS 56th International Symposium & Exhibition
    Nanometer-scale Science and Technology Monday Sessions
       Session NS+BI-MoM

Paper NS+BI-MoM8
Synthesis of Shape Controlled Sinter Resistant Nanoparticles

Monday, November 9, 2009, 10:40 am, Room L

Session: Nanowires and Nanoparticles I
Presenter: N. Shukla, Carnegie Mellon University
Authors: N. Shukla, Carnegie Mellon University
M. Nigra, Carnegie Mellon University
A.J. Gellman, Carnegie Mellon University
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We report synthesis of shape controlled, sinter resistant, core shell nanoparticles. The synthesis conditions allow control of the shell shape and the preparation of hexagonal shells and spherical shells. The 3D structures of these particles have been studied using angle resolved high resolution TEM. 2D cross sectional TEM images show that the cores are not positioned at the centers of the shells. By rotating the nanoparticles and monitoring the apparent motions of the cores in the 2D cross sectional images it is possible to determine the radial position of the core with respect to the center of the shell. The distribution of core positions within the core shell structures is bimodal. These observations suggest that the Fe shells grow on the Pt cores by a nucleation process rather than layer-layer growth.