Journal
ACS NANO
Volume 10, Issue 2, Pages 2893-2902Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b08236
Keywords
nanoparticles; approach; coalescence; surface thermodynamic fluctuation; atomic interaction force
Categories
Funding
- National Natural Science Foundation of China [51375253, 51321092]
- Tsinghua National Laboratory for Information Science and Technology, China
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The approach and coalescence behavior of gold nanoparticles on a silicon surface were investigated by experiments and molecular dynamics simulations. By analyzing the behavior of the atoms in the nanoparticles in the simulations, it was found that the atoms in a single isolated nanoparticle randomly fluctuated and that the surface atoms showed greater fluctuation. The fluctuation increased as the temperature increased. When there were two or more neighboring nanoparticles, the fluctuating surface atoms of the nanoparticles flowed toward the neighboring nanoparticle because of atomic interaction forces between the nanoparticles. With the surface atoms flowing, the gold nanoparticles approached and finally coalesced. The simulation results were in good agreement with the experimental results. It can be concluded that surface thermodynamic fluctuations and are the causes of the approach and coalescence behavior of the gold nanoparticles.
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