Colorimetric detection of Fe(III) ions using label-free gold nanoparticles and acidic thiourea mixture

Suraj Kumar Tripathy, Ju Yeon Woo, Chang Soo Han

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

We report colorimetric, label-free, and non-aggregation-based gold nanoparticle (AuNP) probes for the highly selective detection of Fe(III) ions in aqueous environments. This detection scheme relies on the ability of Fe(III) ions to catalyze the leaching of gold at room temperature in the presence of thiourea species and hydrochloric acid. The catalytic leaching of the AuNP probes results in rapid and remarkable damping of the surface Plasmon band and hence induces a visible color change which can be easily detected through naked eye. This simple and cost-effective probe provides rapid detection of Fe(III) ions at concentrations as low as 50 ppm and expected to be effective to design efficient environmental and biological sensor.

Original languageEnglish
Pages (from-to)114-118
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume181
DOIs
Publication statusPublished - 2013

Keywords

  • Colorimetric
  • Ferric ion
  • Gold nanoparticles
  • Leaching
  • Surface plasmon
  • Thiourea

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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