Square wave voltammetric detection of 2,4,6-trinitrotoluene and 2,4-dinitrotoluene on a gold electrode modified with self-assembled monolayers

Robert G. Bozic, Alan C. West, Rastislav Levicky

Research output: Contribution to journalArticle

Abstract

A rotating disc gold electrode, either bare or modified with an alkanethiol self-assembled monolayer, was used to measure the simultaneous square wave voltammetric differential current response of the electrochemical reduction of the two ordnance-related compounds (ORCs) 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (DNT). On bare electrodes, background currents limited sensitivity to ppm levels. In order to suppress these interfering currents, the gold electrodes were modified with alkanethiols of various chain lengths, from 3 to 12 carbons, with hydrophilic (hydroxyl) or hydrophobic (methyl) end groups presented to the electrolyte. Gold electrodes endowed with hydroxyl-terminated monolayers enabled clear detection of TNT and DNT from mixtures of these two compounds. In addition, longer alkanethiols allowed extension of the working potential range to more negative values than achieved with shorter alkanethiols.

Original languageEnglish (US)
Pages (from-to)509-515
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume133
Issue number2
DOIs
StatePublished - Aug 12 2008

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Keywords

  • 2,4,6-Trinitrotoluene
  • 2,4-Dinitrotoluene
  • Alkanethiol self-assembled monolayers
  • Square wave voltammetry

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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