Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910524
Keywords
core-shell particles; flexible circuits; liquid metals; real-time self-repairing
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Funding
- National Natural Science Foundation of China [51573053]
- Key Project of Guangzhou Science and Technology Plan Project [201904020034]
- Special Funds for Guangdong Science and Technology Plan [2017A070702010]
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As a critical part of flexible electronics, flexible circuits inevitably work in a dynamic state, which causes electrical deterioration of brittle conductive materials (i.e., Cu, Ag, ITO). Recently, gallium-based liquid metal particles (LMPs) with electrical stability and self-repairing have been studied to replace brittle materials owing to their low modulus and excellent conductivity. However, LMP-coated Ga2O3 needs to activate by external sintering, which makes it more complicated to fabricate and gives it a larger short-circuit risk. Core-shell structural particles (Ag@LMPs) that exhibit excellent initial conductivity(8.0 omega sq(-1)) without extra sintering are successfully prepared by coating nanosilver on the surface of LMPs through in situ chemical reduction. The critical stress at which rigid Ag shells rupture can be controlled by adjusting the Ag shell thickness so that LM cores with low moduli can release, achieving real-time self-repairing (within 200 ms) under external destruction. Furthermore, a flexible circuit utilizing Ag@LMPs is fabricated by screen printing, and exhibits outstanding stability and durability (R/R-0 < 1.65 after 10 000 bending cycles in a radius of 0.5 mm) because of the functional core-shell structure. The self-repairable Ag@LMPs prepared in this study are a candidate filler for flexible circuit design through multiple processing methods.
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