A homogeneous electrically conductive silver paste without solid or particle phase was developed using silver alkylcarbamates [(C n H2n−1NHCOO)2Ag, n ≤ 4] as the precursor of the functional phase. The silver alkylcarbamates were light insensitive and had a low decomposition temperature (below 200°C). The paste was a non-Newtonian fluid with viscosity significantly depending on the content of the thickening agent ethyl cellulose. Array patterns with a resolution of 20 μm were obtained using this paste by a micropen direct-writing method. After the paste with about 48 wt.% silver methylcarbamate [(CH3NHCOO)2Ag] precursor was sintered at 180°C for 15 min, an electrically conductive network consisting of more than 95 wt.% silver was formed, and was found to have a volume electrical resistivity on the order of 10−5 Ω cm and a sheet electrical resistivity on the order of 10−2–10−3 Ω/□. The cohesion strength within the sintered paste and the adhesion strength between the sintered paste layer and the alumina ceramic substrate were tested according to test method B of the American Society for Testing and Materials standard D3359-08. None of the sintered paste layer was detached under the test conditions, and the cohesion and adhesion strengths met the highest grade according to the standard.
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Liu, J., Li, X., Wang, X. et al. Electrically Conductive Thick Film Made from Silver Alkylcarbamates. J. Electron. Mater. 39, 2267–2273 (2010). https://doi.org/10.1007/s11664-010-1327-9
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DOI: https://doi.org/10.1007/s11664-010-1327-9