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Issue 10, 2017
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A triboelectric generator based on self-poled Nylon-11 nanowires fabricated by gas-flow assisted template wetting

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Abstract

Triboelectric generators have emerged as potential candidates for mechanical energy harvesting, relying on motion-generated surface charge transfer between materials with different electron affinities. In this regard, synthetic organic materials with strong electron-donating tendencies are far less common than their electron-accepting counterparts. Nylons are notable exceptions, with odd-numbered Nylons such as Nylon-11, exhibiting electric polarisation that could further enhance the surface charge density crucial to triboelectric generator performance. However, the fabrication of Nylon-11 in the required polarised δ′-phase typically requires extremely rapid crystallisation, such as melt-quenching, as well as “poling” via mechanical stretching and/or large electric fields for dipolar alignment. Here, we propose an alternative one-step, near room-temperature fabrication method, namely gas-flow assisted nano-template (GANT) infiltration, by which highly crystalline “self-poled” δ′-phase Nylon-11 nanowires are grown from solution within nanoporous anodised aluminium oxide (AAO) templates. Our gas-flow assisted method allows for controlled crystallisation of the δ′-phase of Nylon-11 through rapid solvent evaporation and an artificially generated extreme temperature gradient within the nanopores of the AAO template, as accurately predicted by finite-element simulations. Furthermore, preferential crystal orientation originating from template-induced nano-confinement effects leads to self-poled δ′-phase Nylon-11 nanowires with higher surface charge distribution than melt-quenched Nylon-11 films, as observed by Kelvin probe force microscopy (KPFM). Correspondingly, a triboelectric nanogenerator (TENG) device based on as-grown templated Nylon-11 nanowires fabricated via GANT infiltration showed a ten-fold increase in output power density as compared to an aluminium-based triboelectric generator, when subjected to identical mechanical excitations.

Graphical abstract: A triboelectric generator based on self-poled Nylon-11 nanowires fabricated by gas-flow assisted template wetting

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Publication details

The article was received on 11 May 2017, accepted on 09 Aug 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7EE01292F
Citation: Energy Environ. Sci., 2017,10, 2180-2189
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    A triboelectric generator based on self-poled Nylon-11 nanowires fabricated by gas-flow assisted template wetting

    Y. S. Choi, Q. Jing, A. Datta, C. Boughey and S. Kar-Narayan, Energy Environ. Sci., 2017, 10, 2180
    DOI: 10.1039/C7EE01292F

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