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Axonic Au Tips Induced Enhancement in Raman Spectra and Biomolecular Sensing

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Abstract

Axonic Au stars with sharp crystalline tips were synthesized via reduction of HAuCl4 capped with cetyl trimethylammonium bromide (CTAB). A seed-mediated method was adopted in which Au seeds were used in the growth solution containing Au+ ions, for initiating the nucleation with CTAB and with ascorbic acid acting as a mild reducing agent. Transmission Electron Microscopy image clearly reveals the synthesis of gold stars. The gold star dispersions display a well-defined optical response as observed by the presence of a sharp surface plasmon resonance centered at 525 nm. The Au stars functionalized with 11-mercaptoundecanoic acid and immobilized with urease showed improved urea-sensing behavior in comparison to pure gold disk in attenuated total reflection surface plasmon resonance (ATR SPR) mode. Surface-enhanced Raman spectroscopy performed using the functionalized Au stars showed a significant enhancement in Raman signals for a wider range of urea concentration (2–20 mg/ml).

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Authors and Affiliations

  1. Amity Institute of Nanotechnology, Amity University, Noida, 201301, India

    Apurve Saini, Saurabh Bedi & Bharat Mehta

  2. Department of Physics, Hansraj College, University of Delhi, Delhi, 110007, India

    Rohit Medwal

  3. Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India

    Rekha Gupta & S. Annapoorni

  4. LNIO, ICD UMR 6281, University of Technology of Troyes and CNRS, 10010, Troyes, France

    Thomas Maurer & Jerome Plain

Authors
  1. Apurve Saini
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  2. Rohit Medwal
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  3. Saurabh Bedi
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  4. Bharat Mehta
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  5. Rekha Gupta
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  6. Thomas Maurer
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  7. Jerome Plain
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  8. S. Annapoorni
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Correspondence to S. Annapoorni.

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Saini, A., Medwal, R., Bedi, S. et al. Axonic Au Tips Induced Enhancement in Raman Spectra and Biomolecular Sensing. Plasmonics 10, 617–623 (2015). https://doi.org/10.1007/s11468-014-9847-4

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  • DOI: https://doi.org/10.1007/s11468-014-9847-4

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