Premium
Experimental investigations on the weakening effect of magnetic fields on surface‐enhanced Raman scattering
Author(s) -
Li Ran,
Chen QianWang,
Zhang Hao,
Kong XiangKai,
Sun YuBing,
Zhong Hao,
Wang Hui,
Zhou Shuai
Publication year - 2013
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.4227
Subject(s) - raman scattering , particle (ecology) , magnetic field , raman spectroscopy , materials science , plasmon , nanotechnology , surface plasmon resonance , molecule , spheres , scattering , chemistry , optoelectronics , nanoparticle , optics , physics , oceanography , organic chemistry , quantum mechanics , astronomy , geology
Currently, because of the wide use of magnetic/metal hybrid materials in the field of surface‐enhanced Raman scattering (SERS), magnetic fields (MFs) as a kind of surrounding environments of SERS substrates have been not ignored. And enormous attentions for the effect of MFs on SERS are very necessary. Our analysis from previous reports shows SERS signals are closely associated with MFs; yet the study of the exact effect of MFs on SERS is still in need of detail and broadening. In this work, we demonstrate that the use of Ni/Au microparticles (MPs) and Au hollow spheres (HSs) to study the effect of MFs on SERS signals. The experiments are preformed from three aspects, including the comparison of SERS signals of Ni/Au MPs with different Ms values, the comparison of SERS signals of Au HSs and Ni/Au MPs under different external MFs, and the comparison of SERS signals of single Au HS particle and single Ni/Au particle in the absence and presence of an external MF. Thereinto, under different external MFs from 0, 0.01, 0.02, 0.04 to 0.08 T, SERS signals of Au HSs and Ni/Au MPs are gradually weaker. According to the experiments, the weakening effect of MFs on SERS is confirmed. It is suggested that the weakening effect is originated from the blue‐shift of surface plasmon resonance and the locking of charge‐transfer from Au to probe molecules. Copyright © 2012 John Wiley & Sons, Ltd.