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Fabrication of Novel Printable Electrically Conductive Adhesives (ECAs) with Excellent Conductivity and Stability Enhanced by the Addition of Polyaniline Nanoparticles

1
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2
Department of Materials Science and Engineering, Southern University of Science and Technology, No. 1088, Xueyuan Road, Xili, Nanshan District, Shenzhen 518055, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 960; https://doi.org/10.3390/nano9070960
Received: 5 June 2019 / Revised: 18 June 2019 / Accepted: 20 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Nanomaterials for the Advanced Manufacturing of Electronic Devices)
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Abstract

Electrically conductive adhesives (ECAs) are one of the low temperature bonding materials. It can be used to replace toxic Sn-Pb solder. The key issue for the application of ECAs is how to improve their electrical properties. In the present study, we develop an effective method to promote the electrical properties of ECAs by addition of polyaniline (PANI) nanoparticles. PANIs were synthesized via a facile one-step chemical oxidative polymerization method. After adding 0.5 wt% PANI nanoparticles, the conductivity of ECAs increased dramatically by an order of magnitude. The bulk resistivity of 8.8 × 10−5 Ω·cm is achieved for 65 wt% silver fillers with 0.5 wt% PANIs loaded ECAs. Besides, this improvement has no negative effect on the shear strength and the aging life of ECAs. Moreover, the use of PANIs not only lowers the percolation threshold of ECAs, but also reduces the cost and improves the bonding reliability. Finally, PANIs enhanced ECAs patterns were successfully printed by a stencil printing method, which proved their potential applications in replacing conventional solder pastes and printing functional circuits. View Full-Text
Keywords: Electrically conductive adhesive; polyaniline; electrical property and reliability; low-temperature bonding; printable circuits Electrically conductive adhesive; polyaniline; electrical property and reliability; low-temperature bonding; printable circuits
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wen, J.; Tian, Y.; Hang, C.; Zheng, Z.; Zhang, H.; Mei, Z.; Hu, X.; Tian, Y. Fabrication of Novel Printable Electrically Conductive Adhesives (ECAs) with Excellent Conductivity and Stability Enhanced by the Addition of Polyaniline Nanoparticles. Nanomaterials 2019, 9, 960.

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