Temperature Estimation during Pulsed Laser Sintering of Silver Nanoparticles
Arif Hussain; Hee-Lak Lee; Yoon-Jae Moon; Heuiseok Kang; Seung-Jae Moon; Jun-Young Hwang
During the thermal sintering of metal nanoparticles (NPs) the process temperature plays the most important role in the outcome of the sintering results and the selection of a suitable substrate. Here, temperature calculation during pulsed laser sintering of silver (Ag) nanoparticles (NPs) inkjet-printed on glass substrates is presented. During the pulsed laser sintering of Ag NPs, a minimum line resistivity less than twice the bulk silver resistivity was obtained within around 52 s under a laser power of 276 mW. The temperature field during the pulsed laser sintering of Ag NPs was estimated via a three-dimensional numerical model in which a temperature-dependent thermal conductivity of Ag NPs was adopted. An algorithm for treating the thermal conductivity of the heated Ag NPs in a region by a previous laser shot was devised for the improvement of the temperature field estimation. A maximum temperature of approximately 204 °:C over the Ag NPs line was obtained with a 276 mW laser power and a scanning speed of 135 &mu:m/s.
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