Abstract
In this study, in order to analyze the low-temperature sintering
process of silver and copper nanoparticles, we calculate their melting
temperatures and surface melting temperatures with respect to particle
size. For this calculation, we introduce the concept of mean-squared
displacement of the atom proposed by Shi (1994). Using a parameter defined
by the vibrational component of melting entropy, we readily obtained the
surface and bulk melting temperatures of copper and silver nanoparticles.
We also calculated the absorption cross-section of nanoparticles for
variation in the wavelength of light. By using the calculated absorption
cross-section of the nanoparticles at the melting temperature, we obtained
the laser threshold energy for the sintering process with respect to
particle size and wavelength of laser. We found that the absorption
cross-section of silver nanoparticles has a resonant peak at a wavelength
of close to 350 nm, yielding the lowest threshold energy. We calculated
the intensity distribution around the nanoparticles using the
finite-difference time-domain method and confirmed the resonant excitation
of silver nanoparticles near the wavelength of the resonant
peak.
© 2016 Optical Society of Korea
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