Journal
CHINESE PHYSICS B
Volume 20, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/20/5/057701
Keywords
dielectrophoresis; gold coated polystyrene microspheres; microwire
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Funding
- National Natural Science Foundation of China [51075087]
- State Key Laboratory of Fluid Power Transmission and Control, ZheJiang University of China [GZKF-201004]
- China Scholarship Council [2009612129]
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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 mu m 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.
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