Calculating the Threshold Energy of the Pulsed Laser Sintering of Silver and Copper Nanoparticles

다국어 초록 (Multilingual 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. Forthis 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 obtainedthe surface and bulk melting temperatures of copper and silver nanoparticles. We also calculated theabsorption cross-section of nanoparticles for variation in the wavelength of light. By using the calculatedabsorption cross-section of the nanoparticles at the melting temperature, we obtained the laser thresholdenergy for the sintering process with respect to particle size and wavelength of laser. We found that theabsorption 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 usingthe finite-difference time-domain method and confirmed the resonant excitation of silver nanoparticles nearthe wavelength of the resonant peak.

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