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 language | English |
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Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Journal of Colloid and Interface Science |
Volume | 494 |
DOIs | |
State | Published - 15 May 2017 |
Keywords
- Aggregates
- Electrolyte
- Gallic acid
- Gold nanoparticles
- Mg
- Quenching