Journal
ANALYTICAL CHEMISTRY
Volume 90, Issue 21, Pages 13044-13050Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b04024
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Funding
- National Natural Science Foundation of China (NSFC) [21522502]
- Fundamental Research Funds for the Central Universities
- Opening Fund of the Key Laboratory of Chemical Biology and Tradition Chinese Medicine Research (Ministry of Education of China)
- Hunan Normal University
- Excellent Youth Scholars of Hunan Provincial Education Department [17B155]
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Rapid quantification of permanganate (MnO4-) in aqueous solution with a convenient and sensitive singleparticle-detection (SPD) method is demonstrated by dark-field optical microscopy. The design is based on the selective etching of the Ag shell of a glucose-protected GNPs@Ag nanoparticle by MnO4-. In the presence of MnO4-, a noticeable red-shift of localized surface-plasmon resonance (LSPR, from blue to green) together with a tremendous decrease in the extinction coefficient from individual GNPs@Ag nanoparticles is observed. MnO4- can then be quantified by calculating the ratio between the number of green and blue particles on the cover glass surface after the etching process. A linear dynamic range of 0-6 mu M and a limit of detection (LOD) as low as 46 nM were readily achieved, which are much lower than those of spectroscopic measurements in bulk solution. In tap water, a comparable LOD (50 nM) and satisfactory recovery efficiency are demonstrated. As a consequence of these merits, the method demonstrated herein will find promising applications for the ultrasensitive detection of MnO4- under complex milieu in the future.
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