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Preparation and SERS Performance of Magnetic Ag@Fe3O4@C Supported Gold Nanoparticles
Author NameAffiliationE-mail
SHEN Mao College of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang, Zhejiang 318000, China  
LIANG Hua-Ding College of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang, Zhejiang 318000, China  
JIN Yan-Xian College of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang, Zhejiang 318000, China  
JIA Wen-Ping College of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang, Zhejiang 318000, China  
CHEN Su-Qing College of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang, Zhejiang 318000, China shanjian8208@163.com 
Abstract: An Ag@Fe3O4@C-Au microspheres has been developed which including the synthesis of Ag@Fe3O4 by one-step via a versatile solvothermal reaction, an interlayer of carbon shell coating around the Ag@Fe3O4 with glucose as carbon source, the surfuce of Ag@Fe3O4@C modified by PEI via amidation reaction, and the coating Au nanoparticles on the surface of Ag@Fe3O4@C. The enhancement effect in the Raman active was investigated by using 4-mercaptobenzoic acid (4MBA) molecules as a probe molecule. In addition, we have regulated the SERS behavior of Ag@Fe3O4@C-Au core-shell microspheres by adjusting the additional amount of Au nanoparticles (NPs). The magnetic hysteresis loops showed the saturation magnetization (Ms) values of Ag@Fe3O4@C-Au-40 are about 411 A·g-1, and the SERS effect of 4MBA on different microspheres is Ag@Fe3O4@C-Au-40 > Ag@Fe3O4@C-Au-10 > Ag@Fe3O4@C-Au-60 > Ag@Fe3O4@C nanospheres, which was identified by Finite Difference Time Domain (FDTD). Furthermore, the low concentrations of 4MBA (1×10-9 mol·L-1) in the solution can be detected by the Ag@Fe3O4@C-Au-40 microspheres. In addition, the Ag@Fe3O4@C-Au microspheres can be recycled with magnet.
Keywords: magnetic  noble metal  surface-enhanced Raman scattering  core-shell
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SHEN Mao,LIANG Hua-Ding,JIN Yan-Xian,JIA Wen-Ping,CHEN Su-Qing.Preparation and SERS Performance of Magnetic Ag@Fe3O4@C Supported Gold Nanoparticles[J].Chinese Journal of Inorganic Chemistry,2018,34(1):92-98.
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Chinese Journal of Inorganic Chemistry