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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:791

Article

Cabello, Gema¹  Nwoko, Kenneth C.²  Marco, Jose F.³  Sanchez-Arenillas, Maria³  Maria Mendez-Torres, Ana⁴  Feldmann, Jorg²  Yanez, Claudia⁴  Smith, Tim A. D.¹ 

[1] Univ Aberdeen, Sch Med Med Sci & Nutr, Aberdeen AB25 2ZD, Scotland

[2] Univ Aberdeen, Sch Nat & Comp Sci, Dept Chem, Aberdeen AB24 3UE, Scotland

[3] CSIC, Inst Quim Fis Rocasolano, C Serrano 119, E-28006 Madrid, Spain

[4] Univ Chile, Fac Ciencias Quim & Farmaceut, Ctr Invest Proc Redox, Santiago, Chile

关键词: Biochemical sensing;    SERS substrate;    Bimetallic nanoparticles;    Microwave-assisted heating;    Core-shell;   

DOI  :  10.1016/j.jallcom.2019.03.279

来源: Elsevier

【 摘 要 】

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 CuxO. 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 x 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. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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