Critical differences in 3D atomic structure of individual ligand-protected nanocrystals in solution

Precise three-dimensional (3D) atomic structure determination of individual nanocrystals is a prerequisite for understanding and predicting their physical properties. Nanocrystals from the same synthesis batch display what are often presumed to be small but possibly important differences in size, lattice distortions, and defects, which can only be understood by structural characterization with high spatial 3D resolution. We solved the structures of individual colloidal platinum nanocrystals by developing atomic-resolution 3D liquid-cell electron microscopy to reveal critical intrinsic heterogeneity of ligand-protected platinum nanocrystals in solution, including structural degeneracies, lattice parameter deviations, internal defects, and strain. These differences in structure lead to substantial contributions to free energies, consequential enough that they must be considered in any discussion of fundamental nanocrystal properties or applications.

Synthesis and Characterization of Shape Controlled Platinum Metal Catalyst

The catalytic and electro catalytic properties was determined by using size and shape of platinum nanoparticles . To produce well defined and controllable shapes of platinum nanoparticles and improve their performance in terms catalytic activity and selectivity many chemical methods has been developed. Synthesis of colloidal platinum nanoparticles in three different shapes by using polyol synthesis method, Polyvinylpyrrolidone (PVP) as a reducing agent in first method. Ethylene glycol has been used as a solvent and addition of silver ions for enhances the crystal growth. Sodium borohydride has been used as the reducing agent in the second method. Most of the papers silver nanoparticles were synthesized. In this paper we try the potassium chloroplatinate has to be reducing platinum nanoparticles by sodium borohydride. The same methods to be using a silver nitrate is convert to silver nanoparticles by using the same reducing agents