journal article·2017-08-30

In Situ Generation of Photosensitive Silver Halide for Improving the Conductivity of Electrically Conductive Adhesives

Chaowei Li, Qiulong Li, Xiaoyang Long, Taotao Li, Jingxin Zhao, Kai Zhang, Songfeng E, Jun Zhang, Zhuo Li, Yagang Yao

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Abstract

Electrically conductive adhesives (ECAs) can be regarded as one of the most promising materials to replace tin/lead solder. However, relatively low conductivity seriously restricts their applications. In the present study, we develop an effective method to decrease the bulk electrical resistivity of ECAs. KI or KBr is added to replace the lubricant and silver oxide layers on silver flakes and to form photosensitive silver halide. After exposure to sunlight, silver halide can photodecompose into silver nanoparticles that will sinter and form metallic bonding between/among flakes during the curing process of ECAs, which would remarkably reduce the resistivity. The modified micro silver flakes play a crucial role in decreasing the electrical resistivity of the corresponding ECAs, exhibiting the lowest resistivity of 7.6 × 10 –5 Ω·cm for 70 wt % loaded ECAs. The obtained ECAs can have wide applications in the electronics industry, where high conductance is required.
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Research context

OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Conducting polymers and applications · Nanomaterials and Printing Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China

School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China

Department of Materials Science, Fudan University, Shanghai 200433, China

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Jiangsu Province · Science and Technology Commission of Shanghai Municipality · Chinese Academy of Sciences · Transformation of Scientific and Technological Achievements in Jiangsu Province · Suzhou City

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