Microwire formation based on dielectrophoresis of electroless gold plated polystyrene microspheres

doi:10.1088/1674-1056/20/5/057701

Abstract Microspheres coated with a perfectly conductive surface have many advantages in the applications of biosensors and micro-electromechanical systems. Polystyrene microspheres with the diameter of 10 upmum were coated with a 50 nm-thick gold layer using an electroless gold plating approach. Dielectrophoresis (DEP) for bare microspheres and shelled microspheres was theoretically analysed and the real part of the Clausius–Mossotti factor was calculated for the two kinds of microspheres. The experiments on the dielectrophoretic characterisation of the uncoated polystyrene microspheres and gold coated polystyrene microspheres (GCPMs) were carried out. Experimental results showed that the gold coated polystyrene microspheres were only acted by a positive dielectrophoretic force when the frequency was below 40M Hz, while the uncoated polystyrene microspheres were governed by a negative dielectrophoretic force in this frequency range. The gold coated polystyrene microspheres were exploited to form the microwire automatically according to their stable dielectrophoretic and electric characterisations.

Keywords: dielectrophoresis gold coated polystyrene microspheres microwire

Received: 12 October 2010
Revised: 21 December 2010
Accepted manuscript online:

PACS:	77.22.-d	(Dielectric properties of solids and liquids)
	41.20.Cv	(Electrostatics; Poisson and Laplace equations, boundary-value problems)
	82.20.Wt	(Computational modeling; simulation)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51075087), the State Key Laboratory of Fluid Power Transmission and Control, ZheJiang University of China (Grnat No. GZKF-201004), and the China Scholarship Council (Grant No. 2009612129).

Cite this article:

Jiang Hong-Yuan(姜洪源), Ren Yu-Kun(任玉坤), and Tao Ye(陶冶) Microwire formation based on dielectrophoresis of electroless gold plated polystyrene microspheres 2011 Chin. Phys. B 20 057701

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Microwire formation based on dielectrophoresis of electroless gold plated polystyrene microspheres

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