Journal
LANGMUIR
Volume 27, Issue 23, Pages 14539-14544Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la203049k
Keywords
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Funding
- National Science Foundation of China [20974023, 21034003, 51073040]
- Shanghai Committee of Science and Technology, China [10XD1400500]
- National Science Foundation for Distinguished Young Scholars of China [50525310]
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A systematic study for the preparation of Ag nanoparticle (Ag-NP) coated poly(styrene-co-acrylic acid) (PSA) composite nanospheres by in situ chemical reduction is reported. The experimental results showed that the reaction temperature and the surface coverage of the -COOH determined the surface coverage and grain size of Ag nanoparticles on the PSA nanospheres. The surface enhanced Raman spectroscopy (SERS) sensitivity was investigated using 4-hydroxythiophenol (4-HBT) as the model probe in the solution of composite nanospheres stabilized by polyvinylpyrrolidone (PSA/Ag-NPs/PVP), with the detection limit of about 1 x 10(-6) M. Potential application of the new SERS substrate was demonstrated with the detection of melamine, and the detection limit was about 1 x 10(-3) M. Chemical noises from PVP and other impurities were observed and attributed mainly to the competitive adsorption of PVP on the surfaces of Ag-NPs. After tetrahydrofuran washing of the PSA/Ag-NPs/PVP substrates that removed the PVP and other residuals, the signal/noise levels of SERS were greatly improved and the detection limit of melamine was determined to be 1 x 10(-7) M. This result indicated that the new PSA/Ag-NPs system is highly effective and can be used as the SERS-active Substrate for trace analysis of a variety of drugs and food additives.
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