A Stretchable Ionic Diode from Copolyelectrolyte Hydrogels with Methacrylated Polysaccharides

As the demand for soft and flexible devices steadily increases, the ionic applications demonstrated with gel materials have come under the spotlight. Here, stretchable and wearable ionic diodes (SIDs) made from polyelectrolyte hydrogels are introduced. Polyelectrolyte hydrogels are mechanically modi...

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Bibliographic Details
Published inAdvanced functional materials Vol. 29; no. 4
Main Authors Lee, Hae‐Ryung, Woo, Jaesung, Han, Seok Hee, Lim, Seung‐Min, Lim, Sungsoo, Kang, Yong‐Woo, Song, Won Jun, Park, Jae‐Man, Chung, Taek Dong, Joo, Young‐Chang, Sun, Jeong‐Yun
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Subscription Services, Inc 24.01.2019
Subjects
Circuits
Copolymers
Diodes
Elastomers
Engraving
Hydrogels
ionic circuit
ionic diode
Ions
LASER engraving
Materials science
polyelectrolyte gel
Polyelectrolytes
Polysaccharides
Potassium salts
stretchable diode
Substrates
Wearable technology
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Summary:As the demand for soft and flexible devices steadily increases, the ionic applications demonstrated with gel materials have come under the spotlight. Here, stretchable and wearable ionic diodes (SIDs) made from polyelectrolyte hydrogels are introduced. Polyelectrolyte hydrogels are mechanically modified using methacrylated polysaccharides while preserving the ion‐permselectivity of poly(sulfopropyl acrylate) potassium salt (PSPA) and poly([acrylamidopropyl]trimethylammonium chloride) (PDMAPAA‐Q), forming ionic copolymers. Then, SIDs composed of polyelectrolyte copolymer hydrogels are fabricated in VHB substrates as a stretchable and transparent insulating layer which is engraved by a laser. The SIDs show rectifying behaviors beyond the stretch of 3 with the aid of perfect adhesion between hydrogels and elastomeric substrates, and preserve their rectifications over hundreds of cycles. The operation of the SID is visualized by a wearable ionic circuit which rectifies ionic currents and lightens the LED under the forward bias during finger movements. A stretchable ionic diode is demonstrated from polyelectrolyte hydrogels. Polyelectrolyte gels are mechanically modified with maintaining their own ion‐selective properties to generate a P–N junction. With the aid of perfect adhesion between the hydrogel materials and an elastomeric substrate, ionic diodes can rectify ionic currents under the applied stretch beyond 3.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201806909