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 journalArticle

4 Citations (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 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

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

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  • Cite this

    Cabello, G., Nwoko, K. C., Marco, J. F., Sánchez-Arenillas, M., Méndez-Torres, A. M., Feldmann, J., Yáñez, C., & 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