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Surface-Confined Synthesis of Silver Nanoparticle Composite Coating on Electrospun Polyimide Nanofibers

Authors

  • Björn Carlberg,

    1. Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Göteborg, SE-412 96, Sweden
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  • Li-Lei Ye,

    1. SHT Smart High-Tech AB, Fysikgränd 3, Göteborg, SE-412 96, Sweden
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  • Johan Liu

    Corresponding author
    1. Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Göteborg, SE-412 96, Sweden
    2. Key Laboratory of New Displays and System Applications and SMIT Center, School of Mechanical Engineering and Automation, Shanghai University Box 282, No. 149 Yanchang Road, 200072 Shanghai, China
    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Göteborg, SE-412 96, Sweden.
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Abstract

A methodology for fabricating hierarchical nanostructures by surface-confined synthesis of silver nanoparticles on electrospun polyimide nanofibers is reported. Through surface-confined imide cleavage at the dianhydride domain via immersion in an aqueous KOH solution, potassium polyamate coatings of accurately defined thickness are formed (at a rate of 25 nm h−1). By utilizing the ion-exchange capability of the polyamate resin, silver ions are introduced through immersion in an aqueous AgNO3 solution. Subsequent reduction of the metal ion species leads to the formation of nanoparticles at the fiber surface. Two modes of reduction, chemical and thermal, are investigated in the report, each leading to distinct morphologies of the nanoparticle coatings. Via thermal reduction, a composite surface layer consisting of monodisperse silver nanoparticles (average diameter 5.2 nm) embedded in a re-imidized polyimide matrix is achieved. In the case of chemical reduction, the reduction process occurs preferentially at the surface of the fiber, leading to the formation of silver nanoparticles anchored at the surface, though not embedded, in a polyamic acid matrix. By regulating the modification depth, control of the particle density on the fiber surface is established. In both reduction approaches, the polyimide nanofiber core exhibits maintained integrity.

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