Highly selective colorimetric detection of hydrochloric acid using unlabeled gold nanoparticles and an oxidizing agent

Suraj Kumar Tripathy, Ju Yeon Woo, Chang-Soo Han

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We report a colorimetric system for the detection of HCl in aqueous environments using unlabeled gold nanoparticle (AuNP) probes. This nonaggregation-based detection system relies on the ability of chloro species to cause rapid leaching of AuNPs in an aqueous dispersion containing a strong oxidizing agent, such as HNO 3 or H 2O 2. The leaching process leads to remarkable damping of the surface plasmon resonance peak of the AuNP dispersion. This method works only with AuNPs of a particular size (∼30 nm diameter). It is highly selective for HCl over several common mineral acids, salts, and anions. This simple and cost-effective sensing system provides rapid and simple detection of HCl at concentrations as low as 500 ppm (far below the hazard limit) in natural water systems.

Original languageEnglish
Pages (from-to)9206-9212
Number of pages7
JournalAnalytical Chemistry
Volume83
Issue number24
DOIs
Publication statusPublished - 2011 Dec 15

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Hydrochloric Acid
Oxidants
Gold
Leaching
Nanoparticles
Surface plasmon resonance
Anions
Minerals
Hazards
Salts
Damping
Acids
Water
Costs

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Highly selective colorimetric detection of hydrochloric acid using unlabeled gold nanoparticles and an oxidizing agent. / Tripathy, Suraj Kumar; Woo, Ju Yeon; Han, Chang-Soo.

In: Analytical Chemistry, Vol. 83, No. 24, 15.12.2011, p. 9206-9212.

Research output: Contribution to journalArticle

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