Journal
APPLIED SPECTROSCOPY
Volume 69, Issue 5, Pages 574-579Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/14-07614R
Keywords
Surface-enhanced Raman scattering; SERS; Polycyclic aromatic hydrocarbon; PAH; Gold colloid solution; pH
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Funding
- National Natural Science Foundation of China [41476081, 40906051]
- China Postdoctoral Science Foundation [2013M530330]
- Shandong Province Natural Science Foundation of China [BS2013HZ006]
- Qingdao Science and Technology Foundation [12-1-4-1-(1)-jch, 14-2-4-96-jch]
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In this study, a gold colloid solution whose parameters were optimized, and without any surfactants, was developed as a surface-enhanced Raman scattering (SERS) substrate for the detection of trace-level polycyclic aromatic hydrocarbons (PAHs). A gold colloid solution with 57 nm gold particles and pH 13 was prepared to be the SERS substrate. It had impressive enhancement that was two orders of magnitude higher than that of a gold colloid solution with 57 nm gold particles and without pH change (pH 6). Even with a compact field-based Raman spectrometer, naphthalene, phenanthrene, anthracene, fluoranthene, and pyrene were detected, with limits of detection at 6.8 n, 3.4 n, 1.8 nM, 0.68 nM (680 pM), and 0.44 nM (440 pM), respectively. The significant enhancement was ascribed to an electromagnetic mechanism and a charge-transfer mechanism. Quantitative analyses for these five PAHs in water were also performed. The SERS intensities of PAHs were found to have good linear dependence relations with the concentrations in low concentration. This high-sensitivity, easily prepared substrate offers a promising technology for the quantitative detection of trace-level PAHs.
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