A gold nanoparticle-based colorimetric sensing ensemble for the colorimetric detection of cyanide ions in aqueous solution
✍ Scribed by Mi Hee Kim; Sudeok Kim; Hyun Hye Jang; Sujung Yi; Seong Hyeok Seo; Min Su Han
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- French
- Weight
- 831 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
A colorimetric sensing ensemble was prepared by mixing readily prepared adenosine triphosphate (ATP)stabilized AuNPs with Cu 2+ -phenanthroline complexes. The sensing mechanism of the ensemble was examined by UV-vis spectrometry and transmission electron microscopy. The studies showed that the Cu 2+ -phenanthroline complex was converted to free phenanthroline when exposed to cyanide anions and the free phenanthroline caused the ATP-stabilized AuNPs to aggregate, which in turn, resulted in a visible color change in the AuNP solution. The ensemble could detect cyanide ions in aqueous solution at physiological pH, either spectrophotometrically or visually, with high selectivity toward cyanide anions over a range of mono-and di-anions commonly found in biological and environmental systems. This sensing ensemble also allows a quantitative assay of the analyte in a neutral aqueous solution, down to a concentration of 10 À5 M.