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Highly stable silica-coated gold nanorods dimers for solution-based SERS
Israa Haidar1, Georges Lévi1, Ludovic Mouton1
1Univ Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75205 Paris Cedex 13, France. leila.boubekeur@univ-paris-diderot.fr.
Physical Chemistry Chemical Physics : PCCP
|November 17, 2016
Summary
Researchers developed stable gold nanorod dimers for enhanced SERS detection. This method improves substrate stability and signal amplification for biosensing applications.
Area of Science:
- Plasmonics
- Nanotechnology
- Surface-Enhanced Raman Scattering (SERS)
Background:
- Controlled assembly of anisotropic plasmonic nanoparticles into stable, highly SERS-active substrates is challenging.
- Existing methods often struggle with long-term stability in suspension.
Purpose of the Study:
- To develop a simple and efficient strategy for assembling gold nanorods (AuNRs) into stable dimers.
- To investigate the SERS enhancement capabilities of these AuNR dimers.
Main Methods:
- Utilized pH-dependent assembly of AuNRs triggered by 1,2-bis(4-pyridyl)ethylene (BPE) linker and quenched with silver nitrate.
- Encapsulated AuNR dimers in a mesoporous silica shell for stability.
- Performed solution-based SERS and discrete dipole approximation (DDA) calculations.
Main Results:
- Achieved stable AuNR dimers in water for over 5 months.
- Demonstrated a two-orders of magnitude increase in SERS enhancement factor for dimers compared to isolated AuNRs.
- Validated experimental SERS results with theoretical DDA studies.
Conclusions:
- The developed mesoporous silica-coated AuNR dimers offer significant SERS enhancement and long-term stability.
- The core-shell plasmonic platforms are promising for future bio-applications due to porosity and biocompatibility.
