高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (7): 1563.

• 研究论文 • 上一篇    下一篇

水/甲苯界面制备均匀可循环SERS基底

张雪姣,梅金华,倪丹丹,郭清华,徐敏敏,姚建林,顾仁敖   

  1. 苏州大学材料与化学化工学部, 苏州 215123
  • 收稿日期:2011-02-23 修回日期:2011-04-27 出版日期:2011-07-10 发布日期:2011-06-02
  • 通讯作者: 姚建林 E-mail:jlyao@suda.edu.cn
  • 基金资助:

    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.

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   

  1. 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.

摘要: 采用在沸水浴中还原硅酸钠的方法制备壳层约4nm的Au@SiO2核壳纳米粒子,利用水/ 甲苯两相界面诱捕出其单粒子层膜并将这层膜转移到Si片上.作为对比,采用化学方法自组装Au@SiO2膜至ITO玻璃表面. 以1,4-对苯二硫作为探针分子考察了它们的SERS活性以及可循环使用性能. 研究结果表明,Au@SiO2核壳粒子可避免待测分子与基底直接接触,NaBH4溶液可作为基底循环的洗涤剂,经化学组装的基底的可循环性能较差,每次洗涤SERS效应均有一定程度降低,而两相界面形成的单粒子致密膜的SERS效应稳定性较好,其循环性能较高,即使洗涤10次后,SERS效应仍未明显降低,此膜可作为循环使用的SERS基底.

关键词: Au@SiO2, 膜, 两相界面, SERS基底, 循环性能

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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