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Ultratrace Naked-Eye Colorimetric Ratio Assay of Chromium(III) Ion in Aqueous Solution via Stimuli-Responsive Morphological Transformation of Silver Nanoflakes.
- Source :
-
Analytical chemistry [Anal Chem] 2019 Mar 19; Vol. 91 (6), pp. 4031-4038. Date of Electronic Publication: 2019 Mar 06. - Publication Year :
- 2019
-
Abstract
- In this work, we discover an effective domino-effect-based detection mechanism for the rapid, high-selectivity, and ultrasensitive naked-eye colorimetric ratio assay of chromium(III) ion (Cr <superscript>3+</superscript> ) in aqueous solutions. This naked-eye colorimetric ratio assay to Cr <superscript>3+</superscript> relies on changes in absorbance properties that are due to the stimuli response of Cr <superscript>3+</superscript> for the morphological transformation of silver nanoflakes. In the presence of Cr <superscript>3+</superscript> , large silver nanoflakes can be stimulated to transform to small nanoparticles (NPs), which promoted a color change in solution from bright yellow to wine red that was detected by the naked eye and spectroscopic absorption methods. The proposed naked-eye sensing strategy was coupled with an ultraviolet (UV)-spectroscopic chemosensor for the detection of trace Cr <superscript>3+</superscript> . The detection method showed an ultralow detection limit of 1.4 nM (nanomole) for Cr <superscript>3+</superscript> in ultrapure water and 11.5 nM in human serum sample, respectively. On the basis of colorimetry, the lowest concentration of ∼50 nM for Cr <superscript>3+</superscript> in ultrapure water and human serum can be detected by the naked eye. This naked-eye-based colorimetric ratio assay for accurate and selective identification and high sensitivity of Cr <superscript>3+</superscript> is expected to have large potential and wide applications such as pharmaceutical analysis, clinical diagnosis, and environmental monitoring.
Details
- Language :
- English
- ISSN :
- 1520-6882
- Volume :
- 91
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Analytical chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 30802033
- Full Text :
- https://doi.org/10.1021/acs.analchem.8b05472