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Surface enhanced Raman scattering of molecules related to highly ordered gold cavities

Authors

  • Zhuomin Gu,

    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
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  • Shu Tian,

    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
    2. School of Chemistry and Chemical Engineering, Nantong University, Nantong, P. R. China
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  • Qun Zhou,

    Corresponding author
    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
    • Correspondence to: Qun Zhou, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China

      E-mail: zhq@suda.edu.cn

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  • Wenjuan Wei,

    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
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  • Lili Zhao,

    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
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  • Xiaowei Li,

    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
    2. State Key Laboratory of Lithium Ion Battery Materials of Jiangsu Province, Institute of Chemical Power Sources, Soochow University, Suzhou, P. R. China
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  • Junwei Zheng

    1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China
    2. State Key Laboratory of Lithium Ion Battery Materials of Jiangsu Province, Institute of Chemical Power Sources, Soochow University, Suzhou, P. R. China
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Abstract

We presented a controlled particles-in-cavity (PIC) pattern for surface-enhanced Raman scattering (SERS) detection. The periodic gold cavity array was fabricated by electrodeposition using highly ordered polystyrene spheres as a template. The as-prepared gold cavities can be used as a SERS active substrate with significant spectral enhancement and reproducibility, which was evaluated by SERS signals using 4-mercaptobenzoic acid (4-MBA) as probe molecules. The surface of these gold cavities was further functionalized with cetyltrimethylammonium bromide molecules, which may immobilize the 4-MBA-modified silver nanoparticles in the gold cavity to form a PIC structure via the electrostatic interaction. We have demonstrated that there exists a pH window for the immobilization of the nanoparticles inside cavities. Therefore, the silver nanoparticles can be selectively immobilized into the functionalized gold cavities under the optimized pH value of the media. Further enhancement of the Raman scattering of the labeled molecules can be achieved due to the interconnection between the silver nanoparticles and gold cavity. Copyright © 2013 John Wiley & Sons, Ltd.

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