Oxygen plasma-treated gold nanoparticle-based field-effect devices as transducer structures for bio-chemical sensing

Jenny Gun, Dan Rizkov, Ovadia Lev*, Maryam H. Abouzar, Arshak Poghossian, Michael J. Schöning

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

EIS (electrolyte-insulator-semiconductor) sensors based on the functionalization of uncoated gold nanoparticles supported on a Si/SiO 2 structure are presented. Oxygen plasma etching at moderate power (<200 W) provides a convenient and efficient way to remove organic capping agents from the gold nanoparticles without significant damage. Higher power intensities destroy the linkage between the SiO2 and the gold nanoparticles, and some of the gold nanoparticles are removed from the surface. The flat-band potential shift, i.e. the pH dependence of the gold-coated EIS sensors is similar (33 mV/pH) to the uncoated EIS pH-sensor. Lead, penicillin and glucose sensors were prepared by immobilization of β-cyclodextrin, penicillinase and glucose oxidase by various immobilization techniques.

Original languageAmerican English
Pages (from-to)395-404
Number of pages10
JournalMicrochimica Acta
Volume164
Issue number3-4
DOIs
StatePublished - Mar 2009

Bibliographical note

Funding Information:
The authors are grateful for the technical assistance of H.-P. Bochem and A. Besmehn for the surface characterization with HRSEM and XPS and to A. Voskevich for the very useful discussions. J. Gun thanks the Alexander von Humboldt Foundation for the financial support.

Keywords

  • EIS sensor
  • Field-effect device
  • Functionalization
  • Glucose
  • Gold nanoparticles
  • Lead
  • Penicillin

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