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

    Fingerprint

    Electrophoresis
    Nanoparticles
    nanoparticles
    Electric potential
    electric potential
    high voltages
    low currents
    Electrodes
    electrodes
    micrometers
    magnification
    Gold
    low voltage
    high current
    Microscopic examination
    high speed
    gold
    microscopy

    ASJC Scopus subject areas

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

    Cite this

    Voltage and current conditions for nanoparticle chain formation using dielectrophoresis. / Koshi, Tomoya; Nakajima, Yuta; Iwase, Eiji.

    In: Micro and Nano Letters, Vol. 12, No. 8, 01.08.2017, p. 532-535.

    Research output: Contribution to journalArticle

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