Tunable fabrication on iron oxide/Au/Ag nanostructures for surface enhanced Raman spectroscopy and magnetic enrichment

Journal of Colloid and Interface Science
Sanyang HanRen-Ao Gu

Abstract

A facile approach was developed to prepare novel multifunctional Fe(2)O(3)/Au/Ag nanostructures integrated with isolated functions involving magnetic and optical properties. The Fe(2)O(3)/Au/Ag hybrid nanoparticles with different thicknesses of Ag shell were prepared by adjusting the amount of the AgNO(3). Surface structures were varied from the rough with pinhole to smooth and pinhole free surfaces with increasing amounts of AgNO(3). The surface plasmon resonance was tuned in a very wide region from that of Au to Ag. Surface enhanced Raman scattering (SERS) effects were also investigated, employing thiophenol (TP) and aminothiophenol (PATP) as probe molecules. It was revealed that the SERS intensity was strongly depended on the molar ratio of Ag and Au. With an increase in the Ag molar fractions, SERS signals were enhanced to the maximum due to the surface plasmon resonance of the pinhole structure. The magnetic enrichment for on line SERS monitoring the molecules with low concentration was performed based on the magnetic core and the SERS activity of the bimetallic shells. This enrichment procedure improved efficiently the limits of the SERS detection. It was shown that the multicomponent nanoparticles have potential applicat...Continue Reading

References

Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Maria MikhaylovaMamoun Muhammed
Apr 26, 2005·Journal of Colloid and Interface Science·Madhuri MandalTarasankar Pal
Feb 17, 2006·Physical Chemistry Chemical Physics : PCCP·Christopher J OrendorffCatherine J Murphy
Jul 17, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Hye-Young ParkChuan-Jian Zhong
May 16, 2009·ACS Nano·Carly S LevinNaomi J Halas

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Citations

Jul 10, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Bharat A MakwanaYadvendra K Agrawal
Jan 29, 2014·Contrast Media & Molecular Imaging·Taeyjuana CurryRachela Popovtzer
Jan 3, 2018·Biophysics Reviews·Olayemi J FakayodeOluwatobi S Oluwafemi
Aug 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Hui HaoYun Yang

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