The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.
Ultrasensitive Copper(II) Detection Using Plasmon-Enhanced and Photo-Brightened Luminescence of CdSe Quantum Dots
Abstract
Here, we present a simple platform for the use of the enhanced emission of 16-mercaptohexadecanoic acid (16-MHA) capped CdSe quantum dots (QDs) as a probe for ultrasensitive copper(II) detection. In this study, the photoluminescence (PL) of the QDs was first enhanced by Ag nanoprisms which were self-assembled on Si surfaces and then further increased by photobrightening. Using this approach, the control and different analytes could be readily probed all on a single platform using fluorescence microscopy. The enhanced PL intensity of CdSe QDs was selectively quenched in the presence of Cu(2+), accompanied by the emergence of a new red-shifted luminescence band. The quenching mechanism was found to be due to a cation exchange mechanism as confirmed by X-ray photoelectron spectroscopy (XPS) measurements. Herein, we have demonstrated that this simple methodology can offer a rapid and reliable detection of Cu(2+) with a detection limit as low as 5 nM and a dynamic range up to 100 muM in a fixed fast reaction time of 5 min. The potential applications of this technique were tested in two ways, for mixed-ion solutions and in physiological fluids, and both experiments exhibited good selectivity toward Cu(2+).
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Metadata
- Authors
- Chan, Y.-H., Chen, J., Liu, Q., Wark, S. E., Son, D. H., & Batteas, J. D.
- Venue
- Analytical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-04-08
- Volume
- 82
- Issue
- 9
- Pages
- 3671-3678
- ISSN
- 0003-2700 (ISSN-L)
- 1520-6882
- OpenAlex
- W2037113654
- Cited by
- 273
- References
- 30
- FWCI
- 11.27
- Type
- journal article
- Language
- en
- Open access
- closed
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