Shear and AC field enhanced carbon nanotube impedance assay for rapid, sensitive, and mismatch-discriminating DNA hybridization

Sagnik Basuray, Satyajyoti Senapati, Andrew Aijian, Andrew R. Mahon, Hsueh Chia Chang

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Other than concentrating the target molecules at the sensor location, we demonstrate two distinct new advantages of an open-flow impedance-sensing platform for DNA hybridization on carbon nanotube (CNT)surface in the presence of a high-frequency AC electric field. The shear-enhanced DNA and ion transport rate to the CNT surface decouples the parasitic double-layer AC impedance signal from the charge-transfer signal due to DNA hybridization. The flow field at high AC frequency also amplifies the charge-transfer rate across the hybridized CNT and provides shear-enhanced discrimination between DNA from targeted species and a closely related congeneric species with three nucleotide mismatches out of 26 bases in a targeted attachment region. This allows sensitive detection of hybridization events in less than 20 min with picomolar target DNA concentrations in a labelfree CNT-based microfluidic detection platform.

Original languageEnglish (US)
Pages (from-to)1823-1830
Number of pages8
JournalACS Nano
Volume3
Issue number7
DOIs
StatePublished - Jul 28 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Keywords

  • Bioassay
  • Carbon nanotube
  • DNA hybridization
  • Impedance
  • Open flow

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