Calcium-modified silk as a biocompatible and strong adhesive for epidermal electronics

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With the increasing interest and demand for epidermal electronics, a strong interface between a sensor and a biological surface is essential, yet achieving such interface is still a challenge. Here, a calcium (Ca)-modified biocompatible silk fibroin as a strong adhesive for epidermal electronics is proposed and the physical principles behind its interfacial and adhesive properties are reported. A strong adhesive characteristic (>800 N m(-1)) is observed because of the increase in both viscoelastic property and mechanical interlocking through the incorporation of Ca ions. Furthermore, additional key characteristics of the Ca-modified silk: reusability, stretchability, biocompatibility, and conductivity, are reported. These characteristics enable a wide range of applications as demonstrated in four epidermal electronic systems: capacitive touch sensor, resistive strain sensor, hydrogel-based drug delivery, and electrocardiogram monitoring sensor. As a reusable, biocompatible, conductive, and strong adhesive with water-degradability, the Ca-modified silk adhesive is a promising candidate for the next-generation adhesive for epidermal biomedical sensors.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-09
Language
English
Article Type
Article
Keywords

PRESSURE-SENSITIVE ADHESIVES; WEARABLE ELECTRONICS; PROTEIN HYDROLYSATE; FIBROIN FILMS; FORMIC-ACID; WATER; GEL; POLYMER; DESIGN; TRANSITION

Citation

ADVANCED FUNCTIONAL MATERIALS, v.28, no.36

ISSN
1616-301X
DOI
10.1002/adfm.201800802
URI
http://hdl.handle.net/10203/245910
Appears in Collection
CBE-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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