Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 261, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.120035
Keywords
Bimetallic Ag-Cu nanoparticles; Fluorescence; Nanoprobe; Dual-mode detection; Colorimetry
Categories
Funding
- China Scholarship Council [201908230064]
- Heilongjiang Postdoctoral fund [LBH-Q17084]
- Fundamental Research Funds for Heilongjiang Provincial Universities [2018-KYYWF-0995]
- Beihai Municipal Science and Technology Bureau [202082024]
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A dual-mode colorimetric and fluorimetric probe was developed using silver/copper bimetallic nanoparticles, which possess surface plasmon resonances and fluorescence emission. The probe shows sensitive detection of Hg2+ through both static and dynamic quenching, with low detection limits and high recovery rates in real samples, demonstrating good environmental tolerance.
A dual-mode colorimetric and fluorimetric probe was successfully established based on silver/copper bimetallic nanoparticles (AgCu-BNPs). The AgCu-BNPs were confirmed as individually bimetallic nanoparticles with a mean size of 7.7 +/- 0.2 nm, as characterized by high resolution transmission electron microscopy. Intriguingly, the AgCu-BNPs possess both surface plasmon resonances (SPR) and fluorescence emission. AgCu-BNPs emanate bright blue fluorescence with optical emission centered at 442 nm with high quantum yield of 30.3%, and AgCu-BNPs were attenuated or even quenched by Hg2+ via both static and dynamic quenching, coincidently accompanied by a visible color change, which endow AgCu-BNPs a unique utility as dual-mode colorimetric and fluorimetric probes. The detection limits as low as 89 nM and 9 nM were determined by dual-mode of AgCu-BNPs, respectively. The recovery rates in real samples were found to be 97.3-118.8%, and 89.5-112.7% by colorimetric and fluorescent methods separately, demonstrates the good environmental tolerance of the dual-mode probe. (C) 2021 Elsevier B.V. All rights reserved.
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