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Networked Gold-Nanoparticle Coatings on Polyethylene: Charge Transport and Strain Sensitivity

Authors

  • Tobias Vossmeyer,

    Corresponding author
    1. Institute of Physical Chemistry, University of Hamburg Grindelallee 117, 20146 Hamburg (Germany)
    2. Center for Applied Nanotechnology (CAN) GmbH Grindelallee 117, 20146 Hamburg (Germany)
    • Institute of Physical Chemistry, University of Hamburg Grindelallee 117, 20146 Hamburg (Germany).
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  • Carsten Stolte,

    1. Institute of Physical Chemistry, University of Hamburg Grindelallee 117, 20146 Hamburg (Germany)
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  • Michael Ijeh,

    1. Institute of Physical Chemistry, University of Hamburg Grindelallee 117, 20146 Hamburg (Germany)
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  • Andreas Kornowski,

    1. Institute of Physical Chemistry, University of Hamburg Grindelallee 117, 20146 Hamburg (Germany)
    2. Center for Applied Nanotechnology (CAN) GmbH Grindelallee 117, 20146 Hamburg (Germany)
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  • Horst Weller

    1. Institute of Physical Chemistry, University of Hamburg Grindelallee 117, 20146 Hamburg (Germany)
    2. Center for Applied Nanotechnology (CAN) GmbH Grindelallee 117, 20146 Hamburg (Germany)
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  • The authors thank Mr. Heiner Pfundt (CAN GmbH), Mrs. Sylvia Bartholdi-Nawrath (University), Mr. Felix Niemeyer, Mrs. Petra Schulz (University) for technical support and Dr. Christian Klinke (University) for his help with respect to the variable-temperature conductance measurements. Mr. Siegfried Uselis (University) is acknowledged for skillfully machining the sample holders. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

Networked films, comprising gold nanoparticles (ca. 4 nm core diameter) and 1,9-nonanedithiol, are deposited onto oxidized low-density polyethylene (LDPE) substrates via layer-by-layer self-assembly. Scanning electron microscopy and transmission electron microscopy images reveal a compact coating with a granular, nanoscale morphology. Conductance measurements at variable temperature are consistent with an Arrhenius-type activation of charge transport (activation energy: 52 meV). The excellent mechanical robustness of the coatings allows for studying their potential application as strain gauges. Expanding the films by up to 3% is accompanied by a reversible and approximately linear increase in resistance of up to approximately 50% (gauge factor ca. 17). Analyzing the results with an activated tunneling model suggests that the average increase in interparticle distances is significantly smaller than the geometric expansion at the substrate surface.

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