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Highly Conductive, Photolithographically Patternable Ionogels for Flexible and Stretchable Electrochemical Devices
Linköping University, Department of Physics, Chemistry and Biology, Sensor and Actuator Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5602-8051
Univ Cergy Pontoise, France.
Univ Cergy Pontoise, France.
Univ Cergy Pontoise, France.
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 25, p. 21601-21611Article in journal (Refereed) Published
Abstract [en]

An ionic conducting membrane is an essential part in various electrochemical devices including ionic actuators. To miniaturize these devices, micropatterns of ionic conducting membrane are desired. Here, we present a novel type of ionogel that can be patterned using standard photolithography and soft imprinting lithography. The ionogel is prepared in situ by UV-initiated free-radical polymerization of thiol acrylate precursors in the presence of ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The resultant ionogel is very flexible with a low Youngs modulus (as low as 0.23 MPa) and shows a very high ionic conductivity (up to 2.4 X 10(-3) S/cm with 75 wt % ionic liquid incorporated) and has a reactive surface due to the excess thiol groups. Micropatterns of ionogel are obtained by using the thiol acrylate ionogel solution as an ionic conducting photoresist with standard photolithography. Water, a solvent immiscible with ionic liquid, is used as the photoresist developer to avoid complete removal of ionic liquid from thin micropatterns of the ionogel. By taking advantage of the reactive surface of ionogels and the photopatternability, ionogels with complex three-dimensional microstructure are developed. The surface of the ionogels can also be easily patterned using UV-assisted soft imprinting lithography. This new type of ionogels may open up for building high-performance flexible electrochemical microdevices.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 10, no 25, p. 21601-21611
Keywords [en]
micropatterning; ionogel; reactive surface; thiol acrylate photochemistry; electrochemical devices; photolithography
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:liu:diva-149873DOI: 10.1021/acsami.8b03537ISI: 000437811400064PubMedID: 29856596OAI: oai:DiVA.org:liu-149873DiVA, id: diva2:1236419
Note

Funding Agencies|European Unions Horizon 2020 research and innovation program under the Marie Sklodowska Curie grant [641822]; Swedish Research Council [VR-2014-3079]

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-22

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Zhong, YongJager, Edwin

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