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 |
Bibliographical note
Funded by Chief Scientists Office (TCS/16/07), Tenovus Scotland (G15-03) and the University of Aberdeen Development Trust. KCN gratefully acknowledges the University of Aberdeen for the Elphinstone PhD scholarship (RG13451-10) and to Postnova Analytics UK for the loan of the AF4 system together with training, support, and advice on the technique. AM Mendez gratefully acknowledges CONICYT (National Commission of Scientific and Technological Research, Chile) for scholarship (21160174). Microscopy was performed in the Microscopy and Histology Core Facility at the University of Aberdeen. GC gratefully acknowledges the advice of Dr Shuiyu Lu (NIH, Maryland) in relation to the use of the MW reactor and Dr R.A Davoglio for useful discussion and suggestions.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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