Advanced Functional Materials

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  1. Control of Polymorphism and Morphology in Solution Sheared Organic Field-Effect Transistors

    Sergi Galindo, Adrián Tamayo, Francesca Leonardi and Marta Mas-Torrent

    Version of Record online: 28 APR 2017 | DOI: 10.1002/adfm.201700526

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    Printed organic semiconductors requirehigh control of polymorphism and morphology to enhance device reproducibility. Thin-film organic field-effect transistors have been prepared by solution shearing using blends of a small molecule semiconductor and a binder polymer. The deposition parameters and solution formulation determine the thin-film morphology and polymorphism, which, in turn, has a crucial impact on the device performance.

  2. Diels–Alder Reversible Thermoset 3D Printing: Isotropic Thermoset Polymers via Fused Filament Fabrication

    Kejia Yang, Jesse C. Grant, Patrice Lamey, Alexandra Joshi-Imre, Benjamin R. Lund, Ronald A. Smaldone and Walter Voit

    Version of Record online: 26 APR 2017 | DOI: 10.1002/adfm.201700318

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    A new process called Diels–Alder reversible thermoset (DART) 3D printing, adapted from fused filament fabrication and based on dynamic, covalent chemistries, and a first generation of printable DART resins are demonstrated with thermoset properties at use temperatures up to 80 °C, superior surface finish, isotropism, and tough mechanical properties along the build direction of 18.36 ± 0.57 MJ m−3.

  3. Simultaneous Tenfold Brightness Enhancement and Emitted-Light Spectral Tunability in Transparent Ambipolar Organic Light-Emitting Transistor by Integration of High-k Photonic Crystal

    Marco Natali, Santiago D. Quiroga, Luca Passoni, Luigino Criante, Emilia Benvenuti, Gabriele Bolognini, Laura Favaretto, Manuela Melucci, Michele Muccini, Francesco Scotognella, Fabio Di Fonzo and Stefano Toffanin

    Version of Record online: 25 APR 2017 | DOI: 10.1002/adfm.201605164

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    Monolithic integration of a high-k 1D photonic crystal as the gate dielectric in a transparent organic light-emitting transistor is reported. One order of magnitude enhancement of the emitted power in ambipolar conditions and as-predicted tunability in the spectral profile of the emitted light.

  4. Solid-State Hybrid Fibrous Supercapacitors Produced by Dead-End Tube Membrane Ultrafiltration

    Yange Yu, Jing Zhong, Wei Sun, Rajesh Kumar and Nikhil Koratkar

    Version of Record online: 25 APR 2017 | DOI: 10.1002/adfm.201606461

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    Dead-end tube membrane ultrafiltration is used to produce a dense compact network structure in which carbon nanotubes are well dispersed between graphene layers, thereby preventing restacking of the graphene sheets and maximizing the electrochemically active surface area of the electrode. This uniform and densely compacted electrode structure results in supercapacitors with very high volumetric energy density (≈2.7 mWh cm−3).

  5. Flexible Piezoelectric Touch Sensor by Alignment of Lead-Free Alkaline Niobate Microcubes in PDMS

    Daniella B. Deutz, Neola T. Mascarenhas, J. Ben J. Schelen, Dago M. de Leeuw, Sybrand van der Zwaag and Pim Groen

    Version of Record online: 24 APR 2017 | DOI: 10.1002/adfm.201700728

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    Composite films of aligned K0.485Na0.485Li0.03NbO3 piezoelectric particles in a polydimethylsiloxane matrix are presented. The lead-free microcubes are dispersed in the uncured matrix and oriented by application of an oscillating dielectrophoretic alignment field. The state-of-the-art piezoelectric constants are measured and quantitatively interpreted. Aligned films are implemented in a flexible touch sensor. The technology will enable the next-generation “3D touch” sensor.