A team of researchers led by National University of Singapore (NUS) have used controlled heating mechanism of Hummingbird liquid heating TEM system to demonstrate the formation of gold core -palladium shell nanoparticles, which led to temperature-dependent  fine tuning of shapes from arrow-headed to cuboidal. The work has been published in JACS.

The growth mechanism of bimetallic nanoparticles have not been well studied at different temperatures using a one-pot wet-chemical synthesis – particularly at high temporal or spatial resolution. This study by Mirsaidov and co-workers demonstrates that it is possible to engineer core-shell nanoparticles of different shapes by tuning the reaction temperature.  For example, the researchers used Au nanorods in Pd precursor solution and observed their growth at two different temperatures – 23°C and 80°C. The shape of the Au-Pd core-shell nanoparticles switched from arrow-headed to cuboidal shapes as the temperature increased – showing different growth dynamics.

Reference: Shu Fen Tan, Geeta Bisht, Utkarsh Anand, Michel Bosman, Xin Ee Yong, and Utkur Mirsaidov. “In situ Kinetic and Thermodynamic Growth Control of Au-Pd Core-Shell Nanoparticles.” Journal of the American Chemical Society (2018). DOI:10.1021/jacs.8b05217

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