Electrochemical sensors based on functionalized nanoporous silica for environmental monitoring

Yuehe Lin, Wassana Yantasee, Glen E. Fryxell, Marianne M. Conner

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

Nanostructured materials enable the development of miniature sensing devices that are compact, low-cost, low-energy-consumption, and easily integrated into field-deployable units. Recently we have successfully developed electrochemical sensors based on functionalized nanostructured materials for the characterization of metal ions. Specifically, glycinylurea self-assembled monolayer on nanoporous silica (Gly-UR SAMMS) has been incorporated in carbon paste electrodes for the detection of toxic metals such as lead, copper, and mercury based on adsorptive stripping voltammetry, while acetamide phosphonic acid self-assembled monolayer on nanoporous silica (Ac-Phos SAMMS) has been used for the detection of uranium. Both electrochemical sensors yield reproducible measurements with excellent detection limits (at ppb level), are selective for target species, does not require the use of mercury film and chelating agents, and require little or no regeneration of electrode materials. The rigid, open, paralleled pore structure combined with suitable interfacial chemistry of SAMMS also results in fast responses of the electrochemical sensors.

Original languageEnglish (US)
Article number91
Pages (from-to)554-560
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5593
DOIs
StatePublished - Dec 1 2004
EventNanosensing Materials and Devices - Philadelphia, PA, United States
Duration: Oct 25 2004Oct 28 2004

Keywords

  • Acetamide phosphonic acid
  • Glycinyl-urea
  • Lead
  • SAMMS
  • Self-assembled monolayer on mesoporous silica
  • Uranium
  • Voltammetry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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