The neck growth mechanisms in low energy laser sintering of gold nanoparticles: a molecular dynamics simulation study

Heng Pan; Seung Hwan Ko; Costas P. Grigoropoulos

doi:10.1117/12.706442

13 March 2007 The neck growth mechanisms in low energy laser sintering of gold nanoparticles: a molecular dynamics simulation study

Heng Pan, Seung Hwan Ko, Costas P. Grigoropoulos

Author Affiliations +

Proceedings Volume 6458, Photon Processing in Microelectronics and Photonics VI; 64581J (2007) https://doi.org/10.1117/12.706442
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

Molecular Dynamics simulations were employed to investigate the mechanism and kinetics of the sintering of two crystalline gold nanoparticles (4.4-10.0nm) induced by low energy laser heating. At low temperature (300K), sintering can occur between two bare nanoparticles by elastic and plastic deformations driven by strong local potential gradients. This initial neck growth occur very fast (<150ps), therefore they are essentially insensitive to laser irradiation. This paper focuses on the subsequent longer time scale intermediate neck growth process induced by laser heating. The classical diffusion based neck growth model is modified to predict the time resolved neck growth during continuous heating with the diffusion coefficients and surface tension extracted from MD simulation. The diffusion model underestimates the neck growth rate for smaller particles (5.4nm) while satisfactory agreement is obtained for larger ones (10nm). The deviation is due to the ultra-fine size effect of below 10nm particles. Possible mechanisms were discussed.

Citation Download Citation

Heng Pan, Seung Hwan Ko, and Costas P. Grigoropoulos "The neck growth mechanisms in low energy laser sintering of gold nanoparticles: a molecular dynamics simulation study", Proc. SPIE 6458, Photon Processing in Microelectronics and Photonics VI, 64581J (13 March 2007); https://doi.org/10.1117/12.706442

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