中国物理B ›› 2011, Vol. 20 ›› Issue (5): 57701-057701.doi: 10.1088/1674-1056/20/5/057701
任玉坤1, 陶冶1, 姜洪源2
Jiang Hong-Yuan(姜洪源)a)b), Ren Yu-Kun(任玉坤) a)†, and Tao Ye(陶冶)a)
摘要: 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.
中图分类号: (Dielectric properties of solids and liquids)