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Bimodal size distributed silver nanoparticles on copper substrate: in situ heat treating under air and protective atmospheres

J. Sopousek, J. Bursik, J. Zalesak, Z. Pesina
Masaryk University, CZ

Keywords: aggregation, low temperature sintering, nano heat effect, DSC, FTIR, TEM


Ag nano-suspension was prepared by a wet synthetic route. The liquid phase consisted of an organic solvent and the particles had a bimodal distribution with a very narrow size distribution (compare Figure 1). The surface of the nanoparticles were protected from oxidation by an organic surfactant. The bimodal nanoparticle distribution was investigated because of it is more advantageous for some applications than unimodal. The synthesis has provided long-term stable suspension with an high fraction of nanoparticles and long-term stability. Thermal activation of the free surface of metallic nanoparticles, nanoparticle aggregation, low-temperature sintering, and the formation of a bulk layer of Ag in between two Cu substrate was monitored via in situ methods (DSC / TG, FTIR, conductivity measurement and visualization in the electron microscope), example on Fig. 2. This in-situ monitoring was carried out under different conditions (inert, air, vacuum). An important outcome is the evaluation of heat effect, which is produced during low-temperature sintering and aggregation of the Ag nanoparticles.
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