Effect of temperature on electrical conductance of inkjet-printed silver nanoparticle ink during continuous wave laser sintering

To determine the effect of temperature on the specific electrical conductance of inkjet-printed ink during continuous wave laser sintering, the temperature of the sintered ink was estimated. The ink, which contained 34wt.% silver nanoparticles with an average size of approximately 50nm, was inkjet-printed onto a liquid crystal display glass substrate. The printed ink was irradiated with a 532nm continuous wave laser for 60s with various laser intensities. During laser irradiation, the in-situ electrical conductance of the sintered ink was measured to estimate the transient thermal conductivity of the ink. The electrical conductance and thermal conductivity of the ink was coupled to obtain the transient temperature by applying the Wiedemann–Franz law to a two-dimensional transient heat conduction equation. The electrical conductance of laser-sintered ink was highly dependent on the sintering temperature of the ink. •The in-situ electrical conductance was measured during the laser sintering process.•Wiedemann–Franz law coupled the electrical conductance with transient temperature.•The transient temperature of the laser-sintered Ag nanoparticle ink was estimated.