Tuning stable and unstable aggregates of gallic acid capped gold nanoparticles using Mg2+ as coordinating agent

Dae Young Kim, Surendra Shinde, Gajanan Ghodake

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

High reducibility of gallic acid allows synthesis of small sized monodisperse gold nanoparticles (GNPs) at ambient temperature (25 °C). Mg2+ rapidly interacts with the gallic acid ligands and suppresses the dispersion of GNPs therefore, causing a decrease in UV–vis absorbance intensity, and color change from red to blue. Thus, the colorimetric response of GNPs with Mg2+ was investigated by observing temporal quenching of UV–vis absorbance and precise tuning of fractal growth of GNP aggregates. Moreover, Mg2+ at concentrations as low as 200 ppb can be detected using gallic acid ligand-mediated coordination chemistry which results quenching in UV–vis absorbance proportional to the exposure time. This gallic acid-based colorimetric sensor shown a great potential for the selective detection of pathologically important electrolyte Mg2+ without any interference from other cations Ca2+ and K+.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Colloid and Interface Science
Volume494
DOIs
StatePublished - 15 May 2017

Keywords

  • Aggregates
  • Electrolyte
  • Gallic acid
  • Gold nanoparticles
  • Mg
  • Quenching

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