Trapping plasmonic nanoparticles with MHz electric fields

Dielectrophoresis drives the motion of nanoparticles through the interaction of their induced dipoles with a non-uniform electric field. We experimentally observe rf dielectrophoresis on 100 nm diameter gold nanoparticles in a solution and show that for MHz frequencies, the nanoparticles can reversi...

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Veröffentlicht in:Applied physics letters 2022-05, Vol.120 (20)
Hauptverfasser: Harlaftis, Filippos, Kos, Dean, Lin, Qianqi, Lim, Kevin T. P., Dumesnil, Calvin, Baumberg, Jeremy J.
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Sprache:eng
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Zusammenfassung:Dielectrophoresis drives the motion of nanoparticles through the interaction of their induced dipoles with a non-uniform electric field. We experimentally observe rf dielectrophoresis on 100 nm diameter gold nanoparticles in a solution and show that for MHz frequencies, the nanoparticles can reversibly aggregate at electrode gaps. A frequency resonance is observed at which reversible trapping of gold nanoparticle “clouds” occurs in the gap center, producing almost a 1000-fold increase in density. Through accounting for gold cores surrounded by a conducting double layer ion shell, a simple model accounts for this reversibility. This suggests that substantial control over nanoparticle separation is possible, enabling the formation of equilibrium nanoarchitectures in specific locations.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0091763