Description
Date/Time: 04-04-2018 - Wednesday - 05:00 PM - 07:00 PM
Thao Ngo1 Hong Yang1

1, University of Illinois-Urbana-Champaign, Urbana, Illinois, United States

Fundamental study on the nucleation and growth of nanoparticles found itself at the forefront with the widespread use of liquid Transmission Electron Microscopy (LTEM) to investigate dynamic growth and assembly processes [1]. The most noble study use LTEM to observe and quantify the nucleation and growth of single colloidal platinum (Pt) nanoparticles [2]. Since then, several theories on the nucleation and growth of nanoparticles have been validated. In other study, other information was even added to existing knowledge. One instance was the revelation of a new hybrid growth process of gold (Au) on Pt icosahedral nanoparticles to form core-shell structures [3]. The aforementioned studies have been carried out by focusing on a small number of particles. Here, the electron beam-induced growth of an ensemble of Au nanoparticles was performed in situ. It was observed that the growth does not follow any single growth mode as proposed by the Liftshitz-Slyosov-Wagner (LSW) theory but is more likely a combination of both LSW growth and growth via coalescence.

[1] Ngo, T.; Yang, H. J. Phys. Chem. Lett. 2015, 6, 5051-5061.
[2] Zheng, H.; Smith, R. K.; Jun, Y. W.; Kisielowski, C.; Dahmen, U.; Alivisators, A. P. Science 2009, 324 (5932), 1309-1312.
[3] Wu, J.; Gao, W.; Wen, J.; Miller, D. J.; Lu, P.; Zuo, J.-M.; Yang, H. Nano Lett. 2015, 15 (4), 2711-2715.

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