Highly sensitive micropatterned interdigitated electrodes for enhancing the concentration effect based on dielectrophoresis

Hye Jin Kim, Heeju Ahn, David S. Lee, Dongsung Park, Jae Hyun Kim, Jinsik Kim, Dae Sung Yoon, Kyo Seon Hwang

Research output: Contribution to journalArticle

Abstract

The concentration effect of dielectrophoresis (DEP) enables detection of biomolecules with high sensitivity. In this study, microstructures were patterned between the interdigitated microelectrodes (IMEs) to increase the concentration effect of DEP. The microstructures increased the electric field gradient (∇E2) between the IMEs to approximately 6.61-fold higher than in the bare IMEs with a gap of 10 µm, resulting in a decreased optimal voltage to concentrate amyloid beta 42 (Aβ42, from 0.8 Vpp to 0.5 Vpp) and tau-441 (from 0.9 Vpp to 0.6 Vpp) between the IMEs. Due to the concentration effect of DEP, the impedance change in the optimal condition was higher than the values in the reference condition at 2.64-fold in Aβ42 detection and at 1.59-fold in tau-441 detection. This concentration effect of DEP was also verified by counting the number of gold (Au) particles which conjugated with the secondary antibody. Finally, an enhanced concentration effect in the patterned IMEs was verified by measuring the impedance change depending on the concentration of Aβ42 and tau-441. Our results suggest that microstructures increase the concentration effect of DEP, leading to enhanced sensitivity of the IMEs.

Original languageEnglish
Article number4152
JournalSensors (Switzerland)
Volume19
Issue number19
DOIs
Publication statusPublished - 2019 Oct 1

Keywords

  • Amyloid beta 42
  • Concentration effect
  • Dielectrophoresis
  • High sensitivity
  • Tau-441

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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