Abstract
Cu 0 (core)-Au 0 (shell) (Cu@Au) bimetallic nanoparticles (NPs) synthesized under microwave-assisted heating were interrogated for surface enhanced Raman scattering (SERS)-active substrates. NPs characterization, by XRD, XPS and UV/vis spectroscopy, showed the formation of self-assembled particles with the occurrence of electron transfer from Cu to Au and the absence of Cu x O. TEM and AF4 demonstrated NPs with a mean diameter of 4.7 nm. Despite the low LSPR shown by small nanoparticles (<10 nm diameter), our Cu@Au NPs showed enhanced SERS effect, demonstrated by the calculated scattering signal enhancement factor (3 × 10 5 ), which may be related to electromagnetic coupling. Selected examples of analytes of interest, including some biomolecules, were studied to demonstrate the versatility of our Cu@Au NPs as SERS-active substrates.
Original language | English |
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Pages (from-to) | 184-192 |
Number of pages | 9 |
Journal | Journal of Alloys and Compounds |
Volume | 791 |
Early online date | 20 Mar 2019 |
DOIs | |
Publication status | Published - 30 Jun 2019 |
Keywords
- Bimetallic nanoparticles
- Biochemical sensing
- Core-shell
- Microwave-assisted heating
- SERS substrate
- GOLD NANOPARTICLES
- PROPANIL
- COPPER NANOPARTICLES
- SILVER
- SIZE
- OPTICAL-PROPERTIES
- ALLOY NANOPARTICLES
- ENHANCED RAMAN-SCATTERING
- IDENTIFICATION
- SPECTROSCOPY
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