Fabrication of Superparamagnetic Fe3O4/Au@Ag and Its SERS Performance

doi:10.6023/A15040262

Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (8): 847-850.DOI: 10.6023/A15040262 Previous Articles Next Articles

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超顺磁性Fe₃O₄/Au@Ag复合材料的合成及其SERS性能研究

李振兴^a,b, 赵爱武^a,b, 高倩^b, 郭红燕^b, 王大朋^b, 李磊^a,b

a 中国科学技术大学化学系合肥 230026;
b 中国科学院合肥智能机械研究所合肥 230031

投稿日期:2015-04-15 发布日期:2015-06-02
通讯作者: 赵爱武 E-mail:awzhao@iim.ac.cn
基金资助:
项目受国家自然科学基金(Nos. 61378038, 21301179)、合肥物质科学技术中心方向项目培育基金(No. 2014FXZY003)和传感技术联合国家重点实验室的资助.

Fabrication of Superparamagnetic Fe₃O₄/Au@Ag and Its SERS Performance

Li Zhenxing^a,b, Zhao Aiwu^a,b, Gao Qian^b, Guo Hongyan^b, Wang Dapeng^b, Li Lei^a,b

a Department of Chemistry, University of Science and Technology of China, Hefei 230026;
b Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031

Received:2015-04-15 Published:2015-06-02
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 61378038, 21301179), the Direction program of Hefei Center of Physical Science and Technology (No. 2014FXZY003) and the State Key Laboratories of Transducer Technology.

In this paper, Fe₃O₄ nanoparticles were synthesized by solvothermal method and uniform silver-coated gold nanoparticles (Au@Ag NPs) were synthesized via seed growth through consecutive two-step reactions. Subsequently, Au@Ag NPs were assembled on the surface of Fe₃O₄ NPs functionalized with PEI due to the bond between -NH₂ and Ag. We have regulated the SERS behavior of Fe₃O₄/Au@Ag NPs by adjusting the addition amount of Au@Ag. This Au@Ag NPs were characterized by Ultraviolet-visible (UV-vis) extinction spectroscopy. From the measurement of UV-vis spectra we can see that Au@Ag has a wide range of plasmon resonance from ca. 320 to 560 nm while one significant peak were observed at 530 nm for the Au NPs. This Fe₃O₄/Au@Ag NPs were systematically characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and surface enhanced Raman spectroscopy (SERS). The SEM and TEM observation showed the NPs are highly monodispersive. The magnetic hysteresis loops showed the saturation magnetization (M_s) values of Fe₃O₄ NPs and Fe₃O₄/Au@Ag NPs are about 83.6 emu·g^-1and 57.1 emu·g^-1, respectively. p-Aminothiophenol (p-ATP) molecules were employed to explore surface-enhanced Raman Spectroscopy (SERS) performance of Fe₃O₄/Au@Ag and showed excellent sensitivity to 2×10^-9mol/L. Simultaneously, Fe₃O₄@Au@Ag NPs were applied to the detection of thiram and showed sensitivity to 10^-6 mol/L. Using these nanoprobes, analyte molecules can be easily captured, magnetically concentrated, and analyzed by SERS. In addition, the Fe₃O₄/Au@Ag NPs can be recycled with magnet, which exhibited great practical potentials.

Key words: superparamagnetism, nanocomposite, SERS, p-ATP, thiram

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Li Zhenxing, Zhao Aiwu, Gao Qian, Guo Hongyan, Wang Dapeng, Li Lei. Fabrication of Superparamagnetic Fe₃O₄/Au@Ag and Its SERS Performance[J]. Acta Chim. Sinica, 2015, 73(8): 847-850.

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超顺磁性Fe₃O₄/Au@Ag复合材料的合成及其SERS性能研究

Fabrication of Superparamagnetic Fe₃O₄/Au@Ag and Its SERS Performance

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超顺磁性Fe3O4/Au@Ag复合材料的合成及其SERS性能研究