Study on surface-enhanced Raman scattering efficiency of Ag core-Au shell bimetallic nanoparticles

Xiao Dong; Huaimin Gu; Jian Kang; Xiaojuan Yuan

doi:10.1117/12.843498

28 October 2009 Study on surface-enhanced Raman scattering efficiency of Ag core-Au shell bimetallic nanoparticles

Xiao Dong, Huaimin Gu, Jian Kang, Xiaojuan Yuan

Proceedings Volume 7519, Eighth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2009); 75191M (2009) https://doi.org/10.1117/12.843498
Event: Photonics and Optoelectronics Meetings 2009, 2009, Wuhan, China

Abstract

In this article, the relationship between the states of Ag core-Au shell (core-shell) nanoparticles (NP) and the intensity of Raman scattering of analytes dissolved in the water and adsorbed on the NP was studied. The core-shell NP were synthesised by coating Au layers over Ag seeds by the method of "seed-growth". To highlight the advantage of the core-shell NP, Ag colloid and Au colloid were chosen for contrasting. The analyte that were chosen for this testing were methylene blue (MB) for the reason that MB has very strong signal in surface-enhanced Raman scattering (SERS). The SERS activity of optimalizing states of Ag and Au colloids were compared with that of core-shell NP when MB was used as analyte. In this study, sodium chloride, sodium sulfate and sodium nitrate were used as aggregating agents for Ag, Au colloids and core-shell NP, because anions have a strong influence on the SERS efficiency and the stability of colloids. The results indicate that core-shell NP can obviously enhance the SERS of MB. The aim of this study is to prove that compared with the metal colloid, the core-shell NP is a high efficiency SERS active substrate.

Citation Download Citation

Xiao Dong, Huaimin Gu, Jian Kang, and Xiaojuan Yuan "Study on surface-enhanced Raman scattering efficiency of Ag core-Au shell bimetallic nanoparticles", Proc. SPIE 7519, Eighth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2009), 75191M (28 October 2009); https://doi.org/10.1117/12.843498

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