期刊
MICROCHIMICA ACTA
卷 183, 期 6, 页码 2047-2053出版社
SPRINGER WIEN
DOI: 10.1007/s00604-016-1846-z
关键词
SERS; Citrate capping; Plasmonic effect; Rhodamine 6G; Sudan red I; Chili; Carcinogen; X-ray photoelectron spectroscopy; High resolution transmission electron microscopy
资金
- National Natural Science Foundation of China [21175060, 21403090]
- Fundamental Research Funds for the Central Universities [JUSRP51507]
- 111 Project [B13025]
Colloidal iridium nanoparticles (IrNPs) were synthesized through an environmentally friendly approach by using trisodium citrate as the capping molecule in an aqueous medium. The resulting colloidal IrNPs have a typical diameter of 2.5 nm and display absorption bands at 250, 400 and 600 nm. They possess uniform morphology, good dispersibility, excellent stability in water, and exhibit strong surface enhanced Raman scattering (SERS) activity with an enhancement factor (EF) of 3.5 x 10(5) at the 1512 cmaEuro3/4(1) peak when using Rhodamine 6G as the probe molecule. The excellent SERS performance of the IrNPs was exemplarily applied to the determination of the industrial colorant Sudan Red I. The peak intensity of the Raman band at 1236 cmaEuro3/4(1) is linearly related to the concentration of Sudan Red I which can be determined by SERS in the 2 nM to 8 mu M concentration range with a limit of detection as low as 0.6 nM. In our perception, this strong SERS activity of the IrNPs has a large potential in the SERS-based quantitation of various chemical substances.
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