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Well-organized raspberry-like Ag@Cu bimetal nanoparticles for highly reliable and reproducible surface-enhanced Raman
Jung-Pil Lee1, Dongchang Chen, Xiaxi Li
1School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, USA. meilin.liu@mse.gatech.edu.
Nanoscale
|October 16, 2013
Summary
We developed novel silver-copper (Ag@Cu) raspberry nanostructures for highly sensitive surface-enhanced Raman scattering (SERS). These nanostructures offer versatile laser excitation options for analyzing fuel cell electrode materials.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) is crucial for studying fuel cell electrode mechanisms due to its sensitivity and surface selectivity.
- Bimetal nanostructures, particularly those involving coinage metals like gold, silver, and copper, are highly sought after as SERS-active materials due to plasmon resonance-enhanced electromagnetic fields.
Purpose of the Study:
- To develop novel SERS-active nanostructures for enhanced probing of surface species and incipient phases on fuel cell electrodes.
- To investigate the SERS performance of unique raspberry-like Ag@Cu nanostructures using various laser excitation wavelengths.
Main Methods:
- Fabrication of raspberry-like nanostructures with a silver (Ag) nanoparticle core decorated by smaller copper (Cu) nanoparticles (Ag@Cu).
- Characterization of the nanostructures' optical properties, including UV-Vis absorption spectra.
- Evaluation of SERS performance using Rhodamine 6G (R6G) molecules and gadolinium-doped ceria thin films with blue, green, and red laser excitation.
Main Results:
- The Ag@Cu raspberry nanostructures exhibited enhanced and broadened UV-Vis absorption spectra.
- These nanostructures demonstrated excellent SERS activity with a large enhancement factor (EF) across multiple laser excitation wavelengths (blue, green, red).
- Highly reliable SERS signals were achieved for R6G and gadolinium-doped ceria.
Conclusions:
- The Ag@Cu raspberry nanostructures are highly effective SERS substrates with versatile excitation capabilities.
- These findings provide a promising platform for advanced in-situ analysis of surface species and reaction mechanisms in fuel cell technologies.
