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Chemical processing of interfacially assembled metal nanowires for surface‐enhanced Raman scattering detection of food contaminants
Author(s) -
Duan Bo,
Hou Shuai,
Wang Peng,
Chen Yonghao,
Xiong Qirong,
Das Paramita,
Duan Hongwei
Publication year - 2021
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.6015
Subject(s) - raman scattering , melamine , raman spectroscopy , detection limit , bimetallic strip , materials science , substrate (aquarium) , nanotechnology , surface enhanced raman spectroscopy , nanoparticle , nanowire , thiram , quenching (fluorescence) , plasmon , chemical engineering , analytical chemistry (journal) , chemistry , metal , optoelectronics , chromatography , optics , composite material , metallurgy , oceanography , engineering , biology , pesticide , agronomy , fluorescence , physics , geology
Abstract We report a new strategy for the fabrication of Ag–Au bimetallic nanowire (NW) arrays by taking advantage of interfacial assembly of plasmonic nanoparticles and galvanic replacement reactions. Galvanic replacement reactions led to the formation of nanospikes on NWs, giving rise to a high density of hotspots across the entire NW array. We employed this NW array as a surface‐enhanced Raman scattering (surface‐enhanced Raman spectroscopy [SERS]) substrate for the detection of two types of food contaminants: thiram (a pesticide) and melamine (an adulterant). Limits of detection (LODs) of 1 and 10 nM were achieved for thiram in juice samples and melamine in milk samples, respectively. Both LODs are lower than the maximum acceptable concentrations imposed by the US government. The results demonstrate tremendous practical potential of Ag–Au NW arrays as surface‐enhanced Raman scattering substrates for the detection of food contaminants.