Citation: Zuo Fangtao, Xu Wei, Zhao Aiwu. A SERS Approach for Rapid Detection of Hg²⁺ Based on Functionalized Fe₃O₄@Ag Nanoparticles[J]. Acta Chimica Sinica, ;2019, 77(4): 379-386. doi: 10.6023/A18110475 shu

A SERS Approach for Rapid Detection of Hg²⁺ Based on Functionalized Fe₃O₄@Ag Nanoparticles

Zuo Fangtao ^a,b,c ,
Xu Wei ^a,b,c ,
Zhao Aiwu ^a,b,c,,

a.
Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031
b.
University of Science and Technology of China, Hefei, 230026 Anhui
c.
State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei 230031

Corresponding author: Zhao Aiwu, awzhao@iim.ac.cn
Received Date: 26 November 2018
Available Online: 14 April 2019
Fund Project: the National Natural Science Foundation of China 61875255Project supported by the National Natural Science Foundation of China (No. 61875255) and the Direction Program of Hefei Center of Physical Science and Technology (No. 2018ZYFX005)the Direction Program of Hefei Center of Physical Science and Technology 2018ZYFX005

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Mercury is an important pollutant, which has attracted wide attention in recent years. Up to now, based on surface enhanced raman spectroscopy (SERS) strategy for detection of Hg²⁺ is very attractive due to its high sensitivity among various detection methods. Based on the "turn-off" mechanism, we synthesized a magnetic Fe₃O₄@Ag nanomaterial for SERS detection of Hg²⁺. The magnetic-plasma resonance nanoparticles, which combine magnetic and plasma resonance properties, can be used for SERS detection of mercury ions with high sensitivity and selectivity. Firstly, the magnetic nanoparticles were prepared by solvothermal reaction, and silver nanoparticles were coated on the surface of magnetic nanoparticles after modification of amino groups. By modifying the positively charged PDADMAC, polyDADMAC (PDDA) layer, the negatively charged methyl orange probe molecule is adsorbed on the surface of Fe₃O₄@Ag, and in the presence of Hg²⁺, a significant decrease in SERS signal can be observed. Due to the short-time reaction of Hg²⁺ and Ag nanoparticles, an amalgam is formed on the surface of the Ag particles, which affects the surface plasmon resonance (SPR) characteristics of the Ag nanoparticles, resulting in enhanced attenuation of the electromagnetic field. And the short-time reaction of Hg²⁺ and Ag nanoparticles also leads to a decrease in the surface zeta potential of the Ag nanoparticles and affects the adsorption of the Raman probe molecules on the surface, resulting in a decrease in the SERS signal. Therefore, the decrease of SERS intensity in the presence of Hg²⁺ is mainly attributed to the interaction between Hg²⁺ and Ag nanoparticles. Through our experiments, it can be proved that the detection limit of the method based on "turn-off" mechanism for detecting Hg²⁺ ions can be as low as 10^-10 mol/L. In addition, this method also shows high selectivity for divalent mercury ions. The SERS nanosensor designed in this experiment can be used to detect the specificity and ultra-sensitivity of Hg²⁺ in the environment, and it also provides great potential for the construction of SERS nanosensor for heavy metal ions.
- surface enhanced Raman spectroscopy (SERS),
- mercury(Ⅱ) ion,
- magnetic nanomaterial,
- rapid detection,
- silver nanoparticle
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A SERS Approach for Rapid Detection of Hg²⁺ Based on Functionalized Fe₃O₄@Ag Nanoparticles