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Journal Articles Plasmonics Year : 2015

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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Dates and versions

hal-02296427 , version 1 (25-09-2019)

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Apurve Saini, Rohit Medwal, Saurabh Bedi, Bharat Mehta, Rekha Gupta, et al.. Axonic Au Tips Induced Enhancement in Raman Spectra and Biomolecular Sensing. Plasmonics, 2015, 10 (3), pp.617-623. ⟨10.1007/s11468-014-9847-4⟩. ⟨hal-02296427⟩

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