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 |
|---|---|
| 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 |
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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
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
Cite this
Cu@Au self-assembled nanoparticles as SERS-active substrates for (bio)molecular sensing. / Cabello, Gema (Corresponding Author); Nwoko, Kenneth C.; Marco, José F.; Sánchez-Arenillas, María; Méndez-Torres, Ana María; Feldmann, Jorg; Yáñez, Claudia; Smith, Tim A.D. (Corresponding Author).
In: Journal of Alloys and Compounds, Vol. 791, 30.06.2019, p. 184-192.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Cu@Au self-assembled nanoparticles as SERS-active substrates for (bio)molecular sensing
AU - Cabello, Gema
AU - Nwoko, Kenneth C.
AU - Marco, José F.
AU - Sánchez-Arenillas, María
AU - Méndez-Torres, Ana María
AU - Feldmann, Jorg
AU - Yáñez, Claudia
AU - Smith, Tim A.D.
N1 - 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.
PY - 2019/6/30
Y1 - 2019/6/30
N2 - 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.
AB - 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.
KW - Bimetallic nanoparticles
KW - Biochemical sensing
KW - Core-shell
KW - Microwave-assisted heating
KW - SERS substrate
KW - GOLD NANOPARTICLES
KW - PROPANIL
KW - COPPER NANOPARTICLES
KW - SILVER
KW - SIZE
KW - OPTICAL-PROPERTIES
KW - ALLOY NANOPARTICLES
KW - ENHANCED RAMAN-SCATTERING
KW - IDENTIFICATION
KW - SPECTROSCOPY
UR - http://www.scopus.com/inward/record.url?scp=85063323104&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/cuau-selfassembled-nanoparticles-sersactive-substrates-biomolecular-sensing
U2 - 10.1016/j.jallcom.2019.03.279
DO - 10.1016/j.jallcom.2019.03.279
M3 - Article
AN - SCOPUS:85063323104
VL - 791
SP - 184
EP - 192
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -