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author:

Leung, S.L. (Leung, S.L..) [1] | Li, M. (Li, M..) [2] | Li, W.J. (Li, W.J..) [3] | Mai, J.D. (Mai, J.D..) [4]

Indexed by:

Scopus

Abstract:

We show that pearl chains of gold nano-particles (Au NPs) are formed consistently between microelectrodes by combining microspotting and dielectrophoretic (DEP) techniques. Experimental results on various sized Au particles and 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 is observed from 10 kHz to 5 MHz for 100 nm diameter Au NPs, and 100 kHz to 10 MHz for 10 nm Au NPs. Variations in formation rate are detected when the applied voltage and particle size varies. At higher voltages, PCF occurs at a higher rate and the formation time decreases. The optimum frequency for Au NPs PCF shifts to a higher frequency region when the particle size decreases. Theoretical analysis is carried out by calculating the DEP force with AC electrokinetics to explain the observations at DEP frequencies ranging from 10 Hz to 10 MHz. Finally, Au NP chains formed between the microelectrodes are shown to vary in resistance consistent with predictions for a simplified model of an impinging jet system, indicating that these Au particle sensors could potentially be used to precisely measure localized temperatures and other localized thermal phenomena. © 2012 Elsevier B.V.

Keyword:

Dielectrophoretic; Impinging jet; Microspotting; Nano-particles; Pearl chain formation; Temperature

Community:

  • [ 1 ] [Leung, S.L.]Centre for Micro and Nano Systems, Chinese University of Hong Kong, Hong Kong, Hong Kong
  • [ 2 ] [Li, M.]Fuzhou University, Fuzhou, China
  • [ 3 ] [Li, W.J.]Dept. of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, Hong Kong
  • [ 4 ] [Mai, J.D.]Micro-Opto-Mechanical-Electronics Division, Electronics and Optoelectronics Research Laboratories, Industrial Technology Research Institute, Chung Hsing Rd., Chutung, Hsinchu 31040, Taiwan

Reprint 's Address:

  • [Mai, J.D.]Micro-Opto-Mechanical-Electronics Division, Electronics and Optoelectronics Research Laboratories, Industrial Technology Research Institute, Chung Hsing Rd., Chutung, Hsinchu 31040, Taiwan

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Source :

Sensors and Actuators, A: Physical

ISSN: 0924-4247

Year: 2012

Volume: 178

Page: 32-39

1 . 8 4 1

JCR@2012

4 . 1 0 0

JCR@2023

JCR Journal Grade:1

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 12

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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