Fabrication of Reproducible SERS Substrate at Toluene/Water Interface

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (7): 1563.

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Fabrication of Reproducible SERS Substrate at Toluene/Water Interface

ZHANG Xue-Jiao, MEI Jin-Hua, NI Dan-Dan, GUO Qing-Hua, XU Min-Min, YAO Jian-Lin*, GU Ren-Ao

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

Received:2011-02-23 Revised:2011-04-27 Online:2011-07-10 Published:2011-06-02
Contact: YAO Jian-Lin E-mail:jlyao@suda.edu.cn
Supported by:
国家自然科学基金(批准号: 20973120, 21073128)和江苏省自然科学基金(批准号: BK2005032)资助.

Abstract

Abstract: The Au@SiO2 core-shell nanoparticles with a shell thickness of 4 nm were prepared by the hydrolysis of sodium silicate in boiling water. A novel method for the assembly of Au@SiO2 nanoparticles film at a toluene-water interface has been developed to prepare a close-packed monolayer film. The film was transferred onto a Si substrate. As a comparison, Au@SiO2 nanoparticles were chemically attached on to ITO substrate. The surface enhanced Raman scattering (SERS) activities and reproducibility of the above two kinds of film substrate were investigated by using 1,4-dithiophenol (1,4-BDT) as probe. The results revealed that the shell of SiO2 avoided the direct contact between the probe and the substrate. The adsorbed probe molecules can be removed by the immersion of the substrate into NaBH4 solution. The Au@SiO2/ITO substrate exhibited poor reproducibility and the SERS activity decreased with the increase of the washing times, while the compact film on Si substrate fabricated from the water-toluene interface showed the high stability and reproducibility for the SERS effect. The Au@SiO2 film formed on the double phase interface could be used as a reproducible SERS substrate.

Key words: Au@SiO2, Film, Toluene-Water Interface, SERS substrate, Reproducibility

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ZHANG Xue-Jiao, MEI Jin-Hua, NI Dan-Dan, GUO Qing-Hua, XU Min-Min, YAO Jian-Lin*, GU Ren-Ao. Fabrication of Reproducible SERS Substrate at Toluene/Water Interface[J]. Chem. J. Chinese Universities, 2011, 32(7): 1563.

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Fabrication of Reproducible SERS Substrate at Toluene/Water Interface

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