Spectroscopy and Surface-Enhanced Raman Spectroscopy
Using poly(diallyldimethylammonium) Chloride
Capped Gold Nanoparticles1
J. Xiao, Y. Y. Meng*, P. L. Zhang, W. Wen, Z. M. Liu, and T. Zhang
MOE Key Laboratory of Laser Life Science & Laboratory of Photonic Chinese Medicine, College of Biophotonics,
South China Normal University, 510631, Guangzhou, China.
*e-mail: mengyy@tom.com
Received May 17, 2012; published online September 3, 2012
Abstract—Chromate (CrVI) has emerged as a widespread environmental contaminant found in groundwater
and surface water, and there is a great need for rapid detection and monitoring of this contaminant. Normal
Raman scattering (NRS) spectroscopy with a detection limit of CrVI at concentrations of 0.2 g/L was attached.
And surface-enhanced Raman scattering (SERS) spectroscopy technique was found to be capable of detecting
CrVI at concentrations as low as 2.5 mg/L using poly(diallyldimethylammonium) chloride modified gold nano-
particles (PDDA-AuNPs) as a substrate. The SERS substrate was successfully fabricated by combining the sel-
fassembly technique with a heat-treatment-based strategy using poly(diallyldimethylammonium) chloride
(PDDA) as the reducing and stabilizing agents. With the 520 cm–1 band of silicon as internal standard, band
intensity ratios of CrVI to silicon, that is I902/I520, were found to have a quantitative relationship with a large
concentration range of CrVI from 0.2 to 20.0 g/L for NRS (R2 = 0.994) and from 2.5 to 25.0 mg/L for SERS (R2
= 0.980), respectively. Besides, the SERS methodology was reproducible, and susceptible to the interference of
pH value. The optimum pH for CrVI detection by SERS was 3.38. The application of NRS and SERS showed
high practical potential for rapid screening and routine analysis of CrVI in environmental samples.
DOI: 10.1134/S1054660X12100258
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