Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 117, Issue 3, Pages 1075-1083Publisher
SPRINGER
DOI: 10.1007/s00339-014-8548-3
Keywords
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Funding
- National Science Foundation of China [11104252]
- Ministry of Education of China [20114101110003]
- fund for Science & Technology innovation team of Zhengzhou [112PCXTD337]
- Science and Technology Program of Henan Province [112102310543]
- Natural Science Foundation of Henan Educational Committee [12A140002, 13A140693]
- fund for Science and Technology development of Zhengzhou [20130825]
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Polyvinylpyrrolidone (PVP)-protected silver nanostructures of various shapes, including nanocubes, nanospheres, and hybrid shapes with nanospheres and nanorods, on the surface of glass or Si substrates (PVP-Ag films) are prepared by using electrostatic self-assembly. With 4-mercaptobenzoic acid (4-MBA) as a probe molecule, it is demonstrated that the PVP-protected silver nanocubes films (PVP-Ag NCs) have better surface-enhanced Raman scattering (SERS) activity with an order of magnitude larger enhancement factors (EF) than the PVP-protected silver nanospheres films and the PVP-protected silver hybrid shapes films, which is confirmed by our numerical simulations. The EF of 4-MBA on the PVP-Ag NCs film are up to similar to 5.38 x 10(6), and the detection limit is at least down to similar to 10(-8) M. The uniformity and reproducibility of the SERS signals on PVP-Ag NCs film are tested by point-to-point and batch-to-batch measurements. Meanwhile, the PVP-Ag films are also shown to be an excellent SERS substrate with good biocompatibility for hemoglobin detection. It is shown that the PVP-Ag NCs films can be used as excellent SERS substrate with good activity, uniformity, reproducibility, and biocompatibility and are promising for a myriad of chemical and biochemical sensing applications.
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