A nanoporous membrane based impedance sensing platform for DNAsensing with gold nanoparticle amplification

Wei Wei Ye, Jing Yu Shi, Chun Yu Chan, Yu Zhang, Mo Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Nucleic acids based detection has become increasingly important for biomedical diagnostics, environ-mental monitoring and food screening. In this paper, a nanoporous alumina membrane based impedancesensing platform with gold nanoparticle tags amplification was developed for DNA sensing. Singlestranded DNA (ssDNA) probes were first covalently immobilized in nanopore walls via chemical link-ers. DNA hybridization in the nanopores induced blockage in the nanopores, which could be detected byelectrochemical impedance spectroscopy (EIS). The blockage signal could be further amplified by goldnanoparticles (AuNPs) conjugation and silver catalytic deposition method to reach a limit of detection(LOD) of 50 pM. This platform is promising for simple, rapid and sensitive DNA detection
Original languageEnglish
Pages (from-to)877-882
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume193
DOIs
Publication statusPublished - 31 Mar 2014

Keywords

  • DNA sensor
  • Gold nanoparticles
  • Nanoporous alumina membrane
  • Silver enhancement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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