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Fabrication of Au nanorod‐coated Fe 3 O 4 microspheres as SERS substrate for pesticide analysis by near‐infrared excitation
Author(s) -
Tang Xianghu,
Dong Ronglu,
Yang Liangbao,
Liu Jinhuai
Publication year - 2015
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.4658
Subject(s) - nanorod , raman spectroscopy , substrate (aquarium) , raman scattering , materials science , excitation , analytical chemistry (journal) , hydrothermal circulation , microsphere , glass microsphere , fluorescence , nanotechnology , chemical engineering , chemistry , optics , chromatography , oceanography , physics , electrical engineering , engineering , geology
Au nanorods coated Fe3O4 (Fe 3 O 4 @NRs) microspheres were designed as functional surface‐enhanced Raman scattering substrate with a feature of magnetic property and used for detection of pesticide residues that are annually used in agriculture by near‐infrared (NIR) excitation. With this strategy, the Fe 3 O 4 microspheres were synthesized by hydrothermal method and surface functionalized with polyethylenimine, and then coated with Au nanorods densely. The Raman spectra were carried out by NIR excitation and 4‐ATP was chosen as the probe molecule. The results showed a good SERS activity of the Fe 3 O 4 @NRs microspheres. Moreover, this substrate could be used for pesticide analysis by portable Raman spectrometer with NIR excitation. Especially, the microspheres could be transferred from pesticides contaminated fruits peel to specially cleaned glass slide with the aid of the external magnetic field, by which the strong fluorescence of the apple components can be avoided while performing the pesticide analysis of fruits peel. Copyright © 2015 John Wiley & Sons, Ltd.