Cellulose‐Based Ionogels for Paper Electronics |
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| Authors: | Stefan Thiemann Swetlana J Sachnov Fredrik Pettersson Roger Bollström Ronald Österbacka Peter Wasserscheid Jana Zaumseil |
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| Affiliation: | 1. Institute of Polymer Materials, Friedrich‐Alexander Universit?t Erlangen‐Nürnberg, Erlangen, Germany;2. Department of Chemical and Bioengineering, Friedrich‐Alexander‐Universit?t Erlangen‐Nürnberg, Erlangen, Germany;3. Physics, Department of Natural Sciences and Center for Functional Materials, ?bo Akademi University, Turku, Finland;4. Center for Functional Materials Laboratory of Paper Coating and Converting, ?bo Akademi University, Turku, Finland |
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| Abstract: | A new class of biofriendly ionogels produced by gelation of microcellulose thin films with tailored 1‐ethyl‐3‐methylimidazolium methylphosphonate ionic liquids are demonstrated. The cellulose ionogels show promising properties for application in flexible electronics, such as transparency, flexibility, transferability, and high specific capacitances of 5 to 15 μF cm?2. They can be laminated onto any substrate such as multilayer‐coated paper and act as high capacitance dielectrics for inorganic (spray‐coated ZnO and colloidal ZnO nanorods) and organic (poly3‐hexylthiophene], P3HT) electrolyte‐gated field‐effect transistors (FETs), that operate at very low voltages (<2 V). Field‐effect mobilities in ionogel‐gated spray‐coated ZnO FETs reach 75 cm2 V?1 s?1 and a typical increase of mobility with decreasing specific capacitance of the ionogel is observed. Solution‐processed, colloidal ZnO nanorods and laminated cellulose ionogels enable the fabrication of the first electrolyte‐gated, flexible circuits on paper, which operate at bending radii down to 1.1 mm. |
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| Keywords: | cellulose ionogels flexible electronics field‐effect transistors zinc oxide electrolyte gating |
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