Local electrical potential detection of DNA by nanowire-nanopore sensors

Ping Xie, Qihua Xiong, Ying Fang, Quan Qing, Charles M. Lieber

Research output: Contribution to journalArticle

221 Scopus citations

Abstract

Nanopores could potentially be used to perform single-molecule DNA sequencing at low cost and with high throughput. Although single base resolution and differentiation have been demonstrated with nanopores using ionic current measurements, direct sequencing has not been achieved because of the difficulties in recording very small (∼pA) ionic currents at a bandwidth consistent with fast translocation speeds. Here, we show that solid-state nanopores can be combined with silicon nanowire field-effect transistors to create sensors in which detection is localized and self-aligned at the nanopore. Well-defined field-effect transistor signals associated with DNA translocation are recorded when an ionic strength gradient is imposed across the nanopores. Measurements and modelling show that field-effect transistor signals are generated by highly localized changes in the electrical potential during DNA translocation, and that nanowire-nanopore sensors could enable large-scale integration with a high intrinsic bandwidth.

Original languageEnglish (US)
Pages (from-to)119-125
Number of pages7
JournalNature nanotechnology
Volume7
Issue number2
DOIs
StatePublished - Feb 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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