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Issue 6, 2019
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A single gold nanoprobe for colorimetric detection of silver(I) ions with dark-field microscopy

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Abstract

Highly sensitive colorimetric detection of silver(I) ions (Ag+) at the single-particle level was developed based on the color of a gold nanoparticle (AuNP) assembly captured by dark-field microscopy (DFM) imaging. Formation of C–Ag+–C bonding between cytosines was utilized to induce interparticle coupling of AuNPs modified with single-strand DNA, resulting in a color change as the signal transduction to quantify Ag+ under DFM imaging. This method allowed visual quantitation of Ag+ in the range of 0.05 nM–250.00 nM and a detection limit of 28.8 pM was achieved. Furthermore, we demonstrated its applicability for the colorimetric detection of Ag+ in a small quantity of real samples, showing the good potential of this developed method for environmental monitoring and drug quality control.

Graphical abstract: A single gold nanoprobe for colorimetric detection of silver(i) ions with dark-field microscopy

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Publication details

The article was received on 11 Dec 2018, accepted on 10 Jan 2019 and first published on 10 Jan 2019


Article type: Paper
DOI: 10.1039/C8AN02397B
Citation: Analyst, 2019,144, 2011-2016

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    A single gold nanoprobe for colorimetric detection of silver(I) ions with dark-field microscopy

    Y. F. Xie, Y. Y. Cheng, M. L. Liu, H. Y. Zou and C. Z. Huang, Analyst, 2019, 144, 2011
    DOI: 10.1039/C8AN02397B

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