Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 4, Issue 8, Pages 3938-3946Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.2c00601
Keywords
nanocomposite; coated paper; laponite; foldable; paper-based electronic; silver conductive ink
Funding
- Advanced Research Center for Green Materials Science and Technology from the Featured Area Research Center Program [110L9006]
- Ministry of Science and Technology in Taiwan [MOST 109-2221-E-002-064 -MY3, MOST 110- 2634-F-002-043, MOST 111-2622-8-007-011]
- National Taiwan University [NTU-CC-110L891503, NTU-CC- 111L890903]
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A laponite/PVA nanocomposite coating was developed to enhance the mechanical stability of foldable printed circuits on paper. The coating employed laponite nanoclay as a flocculant to induce ink deposition and formation of conductive circuits. Cross-linking of laponite and PVA with paper fibers was done to improve the strain durability of the coating during folding.
In this work, a laponite/poly(vinyl alcohol) (PVA) nanocomposite coating was formulated to increase the mechanical stability of foldable printed circuits on paper. A multivalent laponite nanoclay coating was first designed to serve as a flocculant to trigger immediate particle precipitation in printed ink tracks. The flocculation-induced ink deposition resulted in a dense silver nanoplate stacking, and thus the printed circuits on the coated paper showed good conductivity (> 10(5) S/m) after printing without any high-temperature sintering process. To increase the strain durability of the coating in the folding process, laponite and PVA were cross-linked with paper fibers to form a reinforced network with good foldability. The printed conductive circuits adhered well on the coating and showed high electrical stability. The resistance only varied less than 18% in 1000 folding-unfolding cycles and was restored to the original value after unfolding. Several examples were also given to demonstrate the possibility to apply this coating method for paper-based foldable electronics with good portability and reliable electrical functionality.
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