Voltage and current conditions for nanoparticle chain formation using dielectrophoresis

Tomoya Koshi, Yuta Nakajima, Eiji Iwase

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Here, the voltage and current conditions required to form a nanoparticle chain bridging a gap between electrodes that is several tens of micrometres wide have been examined. When a voltage is applied to a gap between electrodes covered with a dispersion of nanoparticles, the nanoparticles are trapped in the gap by dielectrophoresis, forming a nanoparticle chain. It has been considered that a nanoparticle chain is formed in a gap only when a voltage higher than a certain value with a current lower than a certain value is applied to the gap. In this work, certain voltages were first applied with changing current to a 10 ?m-wide gap between electrodes covered with a dispersion of 150 nm-diameter gold nanoparticles, and they found that a nanoparticle chain was formed only when 6.1 Vrms or more with 15 mArms or less was applied. Next, the process of nanoparticle chain formation in a 10 ?m-wide gap was directly observed with high-magnification and high-speed microscopy, and they clarified the behaviour of nanoparticle chain formation when a low voltage, high voltage with high current, and high voltage with low current were applied. Finally, they measured the critical value of current for nanoparticle chain formation in a gap several tens of micrometres wide.

    Original languageEnglish
    Pages (from-to)532-535
    Number of pages4
    JournalMicro and Nano Letters
    Volume12
    Issue number8
    DOIs
    Publication statusPublished - 2017 Aug 1

    ASJC Scopus subject areas

    • Bioengineering
    • Biomedical Engineering
    • Materials Science(all)
    • Condensed Matter Physics

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