Axonic Au Tips Induced Enhancement in Raman Spectra and Biomolecular Sensing

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).
Complete list of metadatas

https://hal-utt.archives-ouvertes.fr/hal-02296427
Contributor : Daniel Gavrysiak <>
Submitted on : Wednesday, September 25, 2019 - 11:09:50 AM
Last modification on : Thursday, September 26, 2019 - 1:26:06 AM

Identifiers

Collections

P2MN | UTT

Citation

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

Share

Metrics

Record views

9