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

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

doi:10.1016/j.jallcom.2019.03.279

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)

^*Corresponding author for this work

Research output: Contribution to journal › Article

1 Citation (Scopus)

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	https://doi.org/10.1016/j.jallcom.2019.03.279
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

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 journal › Article

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

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.",

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",

author = "Gema Cabello and Nwoko, {Kenneth C.} and Marco, {Jos{\'e} F.} and Mar{\'i}a S{\'a}nchez-Arenillas and M{\'e}ndez-Torres, {Ana Mar{\'i}a} and Jorg Feldmann and Claudia Y{\'a}{\~n}ez and Smith, {Tim A.D.}",

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.",

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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.

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KW - Microwave-assisted heating

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KW - COPPER NANOPARTICLES

KW - SILVER

KW - SIZE

KW - OPTICAL-PROPERTIES

KW - ALLOY NANOPARTICLES

KW - ENHANCED RAMAN-SCATTERING

KW - IDENTIFICATION

KW - SPECTROSCOPY

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UR - http://www.mendeley.com/research/cuau-selfassembled-nanoparticles-sersactive-substrates-biomolecular-sensing

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DO - 10.1016/j.jallcom.2019.03.279

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SP - 184

EP - 192

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -

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