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Silver Flakes and Silver Dendrites for Hybrid Electrically Conductive Adhesives with Enhanced Conductivity

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Abstract

Silver dendrites were prepared by a facile replacement reaction between silver nitrate and zinc microparticles of 20 μm in size. The influence of reactant molar ratio, reaction solution volume, silver nitrate concentration, and reaction time on the morphology of dendrites was investigated systematically. It was found that uniform tree-like silver structures are synthesized under the optimal conditions. Their structure can be described as a trunk, symmetrical branches, and leaves, which length scales of 5–10, 1–2 μm, and 100–300 nm, respectively. All features were systematically characterized by scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and x-ray powder diffraction. A hybrid fillers system using silver flakes and dendrites as electrically conductive adhesives (ECAs) exhibited excellent overall performance. This good conductivity can be attributed mainly to the synergy between the silver microflakes (5–20 μm sized irregular sheet structures) and dendrites, allowing more conductive pathways to be formed between the fillers. In order to further optimize the overall electrical conductivity, various mixtures of silver microflakes and silver dendrites were tested in ECAs, with results indicating that the highest conductivity was shown when the amounts of silver microflakes, silver dendrites and the polymer matrix were 69.4 wt.% (20.82 vol.%), 0.6 wt.% (0.18 vol.%), and 30.0 wt.% (79.00 vol.%), respectively. The corresponding mass ratio of silver flakes to silver dendrites was 347:3. The resistivity of ECAs reached as low as 1.7 × 10−4 Ω cm.

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Acknowledgements

This work was financially supported by Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT, No. IRT1161), Program of Science and Technology Innovation Team in Bingtuan (No. 2011CC001). The work was also financially supported by the National Natural Science Foundation of China (No. 11774255), the Key Project of Natural Science Foundation of Tianjin City (No. 17JCZDJC30100) and the Innovation Foundation of Tianjin University (No. 2017XZC-0090).

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Authors and Affiliations

  1. School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, People’s Republic of China

    Hongru Ma & Yanqing Ma

  2. Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, Tianjin, 300072, People’s Republic of China

    Hongru Ma, Xun Tian, Shaocun Yan, Zhe Li & Lei Ma

  3. School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, 832003, People’s Republic of China

    Hongru Ma, Xun Tian, Shaocun Yan, Zhe Li & Xuhong Guo

  4. Department of Materials Science, Fudan University, 220 Handan Road, Shanghai, 200433, People’s Republic of China

    Zhuo Li

  5. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China

    Xuhong Guo

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  1. Hongru Ma
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  2. Zhuo Li
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Correspondence to Yanqing Ma or Lei Ma.

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Ma, H., Li, Z., Tian, X. et al. Silver Flakes and Silver Dendrites for Hybrid Electrically Conductive Adhesives with Enhanced Conductivity. J. Electron. Mater. 47, 2929–2939 (2018). https://doi.org/10.1007/s11664-018-6145-5

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  • DOI: https://doi.org/10.1007/s11664-018-6145-5

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