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Gold Nanoparticle-Based Sensing of “Spectroscopically Silent” Heavy Metal Ions
Abstract
A simple colorimetric technique for the detection of small concentrations of aqueous heavy metal ions, including toxic metals such as lead, cadmium, and mercury, is described. Functionalized gold nanoparticles are aggregated in solution in the presence of divalent metal ions by an ion-templated chelation process; this causes an easily measurable change in the absorption spectrum of the particles. The aggregation also enhances the hyper-Rayleigh scattering (HRS) response from the nanoparticle solutions, providing an inherently more sensitive method of detection. The chelation/aggregation process is reversible via addition of a strong metal ion chelator such as EDTA. Suggestions for improving the sensitivity and selectivity of the technique are given.
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Citations
Cited by
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Hutter, E., & Fendler, J. H. (2004) · Advanced Materials · doi:10.1002/adma.200400271 · Cited by 2,726
Ray, P. C. (2010) · Chemical Reviews · doi:10.1021/cr900335q · Cited by 773
Electromagnetic Mechanism of SERS
Schatz, G. C., Young, M. A., & Duyne, R. P. (2006) · Topics in Applied Physics · doi:10.1007/3-540-33567-6_2 · Cited by 469
Fluorescent sensor based models for the detection of environmentally-related toxic heavy metals
Rasheed, T., Bilal, M., Nabeel, F., Iqbal, H. M. N., Li, C., & Zhou, Y. (2018) · Science of The Total Environment · doi:10.1016/j.scitotenv.2017.09.126 · Cited by 396
Metadata
- Authors
- Kim, Y., Johnson, R. C., & Hupp, J. T.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-03-09
- Volume
- 1
- Issue
- 4
- Pages
- 165-167
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2014774010
- Cited by
- 907
- References
- 0
- FWCI
- 11.47
- Type
- journal article
- Language
- en
- Open access
- closed
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