Pearl Chain Formation of Nanoparticles in Microelectrode Gaps by Dielectrophoresis

Kretschmer, Robert; Fritzsche, Wolfgang

doi:10.1021/la0482352

Cited by 115 publications

(94 citation statements)

References 16 publications

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“…Since then, several works have extensively reported the use of metal nanoparticles for bridging electrodes [81][82][83][84][85][86][87][88]. The influence of signal frequency on the metal nanoparticle assembly in small gaps between electrodes was studied in ref.…”

Section: Metal Particle Assembly On Microelectrode Structuresmentioning

confidence: 99%

AC electrokinetics of conducting microparticles: A review

Ramos

García-Sánchez

Morgan

2016

Current Opinion in Colloid & Interface Science

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This paper reviews both theory and experimental observation of the AC electrokinetic properties of conducting microparticles suspended in an aqueous electrolyte. Applied AC electric fields interact with the induced charge in the electrical double layer at the metal particle-electrolyte interface. In general, particle motion is governed by both the electric field interacting with the induced dipole on the particle and also the induced-charge electro-osmotic (ICEO) flow around the particle. The importance of the RC time for charging the double layer is highlighted. Experimental measurements of the AC electrokinetic behaviour of conducting particles (dielectrophoresis, electro-rotation and electro-orientation) are compared with theory, providing a comprehensive review of the relative importance of particle motion due to forces on the induced dipole compared with motion arising from induced-charge electro-osmotic flow. In addition, the electric-field driven assembly of conducting particles is reviewed in relation to their AC electrokinetic properties and behaviour.

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Section: Metal Particle Assembly On Microelectrode Structuresmentioning

confidence: 99%

AC electrokinetics of conducting microparticles: A review

Ramos

García-Sánchez

Morgan

2016

Current Opinion in Colloid & Interface Science

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“…Semiconductor nanowires is fabricated via using gold nanoparticles as catalysts. Recently, dielectrophoretic (DEP) technique is used to manipulate gold nanoparticles directly (e.g., see [2,6]). …”

Section: Introductionmentioning

confidence: 99%

Fabrication of gold nano-particle based sensors using microspotting and DEP technologies

Leung

Lau

et al. 2008

2008 SICE Annual Conference

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Abstract:We have shown that Au nanoparticles (Au NPs) pearl chain could be formed consistently between microelectrodes by combining microspotting and DEP technologies. Experimental results on varying the Au particle size and dielectrophoretic (DEP) parameters, including voltage and frequency, are reported in this paper to explore the critical parameters in controlling the Pearl Chain Formation (PCF) process between microelectrodes. PCF was observed from 10kHz to 5MHz for 100nm Au NPs, and 100kHz to 10MHz for 10nm Au NPs. Variations in formation rate were detected when the applied voltage and particle size varied. With higher voltage, pearl chain began to form at higher rate and the formation time decreased. The optimum frequency of the Au NPs PCF shifted to higher frequency region when the particle size decreased. Theoretical analysis was carried out by applying the theories of DEP force and AC electrokinetics to explain the observations with the DEP frequency ranging from 10 Hz to 10MHz. Finally, Au nanoparticle chains formed between the microelectrodes were shown to vary in resistance when environmental temperature was changed, indicating that these Au particle sensors could potentially be used to sense temperature and other thermal-based physical phenomena.

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“…Instead, the particles are mostly assembled on the edge of the electrode with short-range NP agglomerations protruding outward at sharp corners ͓see voltage from megahertz to kilohertz range, large clusters of particles are usually assembled around opposing electrodes, and it was also reported that increasing the frequency to 1 MHz results in narrow and highly oriented nanowires of less than 100 nm in diameter. 23 For electrode pair with gaps of 10 m and above, the NP wires can be effectively assembled from both ac and grounded sides of the electrodes. NP lines can also grow from different corners of the same electrode as long as the field gradient is high enough due to geometrical configuration ͓see Figs.…”

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confidence: 99%

Directed assembly of gold nanoparticle nanowires and networks for nanodevices

Xiong

Busnaina

Selvarasah

et al. 2007

Applied Physics Letters

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Alternating electric field is used to assemble gold nanoparticle nanowires from liquid suspensions. The effects of electrode geometry and the dielectrophoresis force on the chaining and branching of nanowire formation are investigated. The nanowire assembly processes are modeled using finite element calculations, and the particle trajectories under the combined influence of dielectrophoresis force and viscous drag are simulated. Nanoparticle nanowires with 10 nm resolution are fabricated. The wires can be further oriented along an externally introduced flow. This work provides an approach towards rapid assembly and organization of ultrasmall nanoparticle networks.

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Pearl Chain Formation of Nanoparticles in Microelectrode Gaps by Dielectrophoresis

Cited by 115 publications

References 16 publications

AC electrokinetics of conducting microparticles: A review

AC electrokinetics of conducting microparticles: A review

Fabrication of gold nano-particle based sensors using microspotting and DEP technologies

Directed assembly of gold nanoparticle nanowires and networks for nanodevices

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