The solid-state neck growth mechanisms in low energy laser sintering of gold nanoparticles: A molecular dynamics simulation study

Cited 80 time in webofscience Cited 0 time in scopus
  • Hit : 283
  • Download : 5
Molecular dynamics (MD) simulations were employed to investigate the mechanism and kinetics of the solid-state sintering of two crystalline gold nanoparticles (4.4-10.0 nm) induced by low energy laser heating. At low temperature (300 K), sintering can occur between two bare nanoparticles by elastic and plastic deformation driven by strong local potential gradients. This initial neck growth occurs very fast (< 150 ps), and is therefore 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 (5.4 nm) while satisfactory agreement is obtained for larger particles (10 nm). The deviation is due to the ultrafine size effect for particles below 10 nm. Various possible mechanisms were identified and discussed.
Publisher
ASME-AMER SOC MECHANICAL ENG
Issue Date
2008-09
Language
English
Article Type
Article
Keywords

GRAIN-BOUNDARY; SURFACE DIFFUSION; COALESCENCE; PARTICLES; MODEL; AREA

Citation

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, v.130, no.9

ISSN
0022-1481
DOI
10.1115/1.2943303
URI
http://hdl.handle.net/10203/18909
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 80 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0