Facile Synthesis of Fe3O4@Au Core-shell Nanocomposites as an SERS Substrate for the Detection of Thiram †

doi:10.7503/cjcu20190183

Abstract

Abstract:

Fe₃O₄ nanomaterial was prepared by thermal decomposition method, and then Fe₃O₄-Au core-satellite nanocomposites and Fe₃O₄@Au core-shell nanocomposites were prepared by seed deposition method and seed-mediated growth method, respectively. The morphology of the Fe₃O₄-Au core-satellite nanocompo-sites and Fe₃O₄@Au core-shell nanocomposites were uniform and the Au nanoparticles were uniformly deposited/coated on the surface of Fe₃O₄ nanomaterials. The samples had good magnetic responsiveness. Using 4-aminothiophenol(4-ATP) as Raman probe molecule, the Raman signal enhancement effect of the two nanocomposites as SERS substrates was compared. The results showed that the Fe₃O₄@Au core-shell nanocompo-site was a better SERS substrate, and had good signal reproducibility. Finally, using Fe₃O₄@Au core-shell nanocomposite as SERS substrate, the SERS signal of the residual thiram was detected on the apple peel successfully.

Key words: Fe₃O₄, Au, Core-shell nanocomposites, Surface enhanced Raman scattering(SERS), Thriam

CLC Number:

O611

TrendMD:

HAN Donglai,LI Boxun,YANG Shuo,YAN Yongsheng,YANG Lili,LIU Yang,LI Chunxiang. Facile Synthesis of Fe₃O₄@Au Core-shell Nanocomposites as an SERS Substrate for the Detection of Thiram ^†[J]. Chem. J. Chinese Universities, 2019, 40(10): 2067.

Figures/Tables 10

Scheme 1 Schematic illustration of the synthesis process of Fe3O4@Au core-shell nanocomposites and their application in detecting the cycle of 4-ATP by SERS

Fig.1 XRD patterns of the prepared Fe3O4(a), Fe3O4-Au(b) and Fe3O4@Au(c)

Fig.2 Survey XPS spectra(A) and high resolution XPS spectra of Au 4f(B) of the prepared Fe3O4, Fe3O4-Au, and Fe3O4@Au

Fig.3 SEM images of the prepared Fe3O4 nanoparticles(A), Fe3O4-Au core-satellite nanocomposites(B) and Fe3O4@Au core-shell nanocomposites(C)

Fig.4 TEM images of Fe3O4 nanoparticles(A), Fe3O4-Au core-satellite nanocomposites(B) and Fe3O4@Au core-shell nanocomposites(C)

Fig.5 UV-Vis spectra of the gold sol(a), Fe3O4 nanoparticles(b), Fe3O4-Au core-satellite nanocomposites(c) and Fe3O4@Au core-shell nanocomposites(d)

Fig.6 M-H loops of Fe3O4 nanoparticles(a), Fe3O4-Au core-satellite nanocomposites(b) and Fe3O4@Au core-shell nanocomposites(c)

Fig.7 SERS spectra of 1×10-3 mol/L 4-ATP on Fe3O4@Au core-shell nanocomposites and Fe3O4-Au core-satellite nanocomposites(A) and SERS spectra of 10 cycles on Fe3O4@Au core-shell nano-composites(B)

Scheme 2 Illustration of Fe3O4@Au core-shell nanocomposites being used as an SERS substrate to detect the residual thiram on the surface of apple peel

Fig.8 SERS spectrum of thiram detected on apple peel with Fe3O4@Au core-shell nanocomposite as substrate

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Facile Synthesis of Fe₃O₄@Au Core-shell Nanocomposites as an SERS Substrate for the Detection of Thiram ^†

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