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Sensors 2015, 15(5), 10973-10990; doi:10.3390/s150510973

A Tapered Aluminium Microelectrode Array for Improvement of Dielectrophoresis-Based Particle Manipulation

Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia
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Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 16 December 2014 / Revised: 18 March 2015 / Accepted: 20 March 2015 / Published: 11 May 2015
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [4061 KB, uploaded 11 May 2015]   |  

Abstract

In this work, the dielectrophoretic force (FDEP) response of Aluminium Microelectrode Arrays with tapered profile is investigated through experimental measurements and numerical simulations. A standard CMOS processing technique with a step for the formation of a tapered profile resist is implemented in the fabrication of Tapered Aluminium Microelectrode Arrays (TAMA). The FDEP is investigated through analysis of the Clausius-Mossotti factor (CMF) and cross-over frequency (fxo). The performance of TAMA with various side wall angles is compared to that of microelectrodes with a straight cut sidewall profile over a wide range of frequencies through FEM numerical simulations. Additionally, electric field measurement (EFM) is performed through scanning probe microscopy (SPM) in order to obtain the region of force focus in both platforms. Results showed that the tapered profile microelectrodes with angles between 60° and 70° produce the highest electric field gradient on the particles. Also, the region of the strongest electric field in TAMA is located at the bottom and top edge of microelectrode while the strongest electric field in microelectrodes with straight cut profile is found at the top corner of the microelectrode. The latter property of microelectrodes improves the probability of capturing/repelling the particles at the microelectrode’s side wall. View Full-Text
Keywords: dielectrophoresis; taper microelectrode; CMOS; numerical simulation; array dielectrophoresis; taper microelectrode; CMOS; numerical simulation; array
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Buyong, M.R.; Larki, F.; Faiz, M.S.; Hamzah, A.A.; Yunas, J.; Majlis, B.Y. A Tapered Aluminium Microelectrode Array for Improvement of Dielectrophoresis-Based Particle Manipulation. Sensors 2015, 15, 10973-10990.

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