Cu@Au self-assembled nanoparticles as SERS-active substrates for (bio)molecular sensing

Gema Cabello (Corresponding Author), Kenneth C. Nwoko, José F. Marco, María Sánchez-Arenillas, Ana María Méndez-Torres, Jorg Feldmann, Claudia Yáñez, Tim A.D. Smith (Corresponding Author)

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)184-192
Number of pages9
JournalJournal of Alloys and Compounds
Volume791
Early online date20 Mar 2019
DOIs
Publication statusPublished - 30 Jun 2019

Fingerprint

Raman scattering
Nanoparticles
Substrates
Electromagnetic coupling
Biomolecules
Ultraviolet spectroscopy
X ray photoelectron spectroscopy
Microwaves
Scattering
Transmission electron microscopy
Heating
Electrons

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

Cabello, G., Nwoko, K. C., Marco, J. F., Sánchez-Arenillas, M., Méndez-Torres, A. M., Feldmann, J., ... Smith, T. A. D. (2019). Cu@Au self-assembled nanoparticles as SERS-active substrates for (bio)molecular sensing. Journal of Alloys and Compounds, 791, 184-192. https://doi.org/10.1016/j.jallcom.2019.03.279

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 journalArticle

Cabello, G, Nwoko, KC, Marco, JF, Sánchez-Arenillas, M, Méndez-Torres, AM, Feldmann, J, Yáñez, C & Smith, TAD 2019, 'Cu@Au self-assembled nanoparticles as SERS-active substrates for (bio)molecular sensing' Journal of Alloys and Compounds, vol. 791, pp. 184-192. https://doi.org/10.1016/j.jallcom.2019.03.279
Cabello, Gema ; Nwoko, Kenneth C. ; Marco, José F. ; Sánchez-Arenillas, María ; Méndez-Torres, Ana María ; Feldmann, Jorg ; Yáñez, Claudia ; Smith, Tim A.D. / Cu@Au self-assembled nanoparticles as SERS-active substrates for (bio)molecular sensing. In: Journal of Alloys and Compounds. 2019 ; Vol. 791. pp. 184-192.
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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.",
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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.

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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.

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