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Speckled SiO2@Au Core–Shell Particles as Surface Enhanced Raman Scattering Probes

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Abstract

Silica particles of ~800 nm size were functionalized using 3-amino propyl triethoxysilane molecules on which gold particles (~20 nm size) were deposited. The resulting particles appeared to form speckled SiO2@Au core–shell particles. The surface roughness, along with hot spots, due to nanogaps between the gold nanoparticles was responsible for the enhancement of the Raman signal of crystal violet molecules by ~3.2 × 107 and by ~1.42 × 108 of single-wall carbon nanotubes. It has also been observed that the electromagnetic excitation near surface plasmon resonance (SPR) of core–shell particles is more effective than off resonance SPR excitation.

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Acknowledgments

PK, ST, and PL thank Capital Normal University, Beijing, China, for the travel support. SK would like to thank UGC and DST India, project no. SR/NM/NS-42/2009, for the support. This research was supported by the Foundation of the Beijing Key Laboratory and the National Natural Science Foundation of China (grant no. 21073124).

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Authors and Affiliations

  1. Department of Chemistry, Banasthali University, Banasthali, 304022, India

    Parul Khurana & Sheenam Thatai

  2. The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing, 100048, China

    Peijie Wang, Lisheng Zhang & Yan Fang

  3. Marathwada Mitra Mandal’s Institute of Technology, Lohgaon, Pune, 411032, India

    Prashant Lihitkar

  4. Physics Department, Indian Institute of Science Education and Research, Pune, 411021, India

    S. K. Kulkarni

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  1. Parul Khurana
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  2. Sheenam Thatai
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  4. Prashant Lihitkar
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  5. Lisheng Zhang
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  6. Yan Fang
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  7. S. K. Kulkarni
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Correspondence to S. K. Kulkarni.

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Khurana, P., Thatai, S., Wang, P. et al. Speckled SiO2@Au Core–Shell Particles as Surface Enhanced Raman Scattering Probes. Plasmonics 8, 185–191 (2013). https://doi.org/10.1007/s11468-012-9374-0

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  • DOI: https://doi.org/10.1007/s11468-012-9374-0

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