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A monolayer of hierarchical Ag mesoparticles with tunable surface to pographies for highly sensitive SERS
ZHU Shuangmei 1 #,FAN Chunzhen 2,MAO Yanchao 2,HE Jinna 2,LIANG Erjun 2 *
1.School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China
2.School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China
*Correspondence author
#Submitted by
Subject:
Funding: National Natural Science Foundations of China（No.11574276, 11404291, 11504333）, Natural Science Foundation of Henan Educational Committee（No.12A140002）, Fund for Science & Technology Development of Zhengzhou（No.20130825）, Specialized Research Fund for the Doctoral Program of Higher Education （No.20114101110003）, Science and Technology Program of Henan Province（No.112102310543）
Opened online: 7 December 2015
Accepted by: none
Citation: ZHU Shuangmei,FAN Chunzhen,MAO Yanchao.A monolayer of hierarchical Ag mesoparticles with tunable surface to pographies for highly sensitive SERS[OL]. [ 7 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4666574
 
 
We proposed a facile green synthesis system to synthesize large-scale Ag hemi-mesoparticles monolayer on Cu foil. Ag mesoparticles have different surface morphology on their surfaces, including ridge-like shapes, meatball-like, and fluffy-likeshapes. In the reaction, silver nitrate was reduced by copper at room temperature in dimethyl sulfoxide via the galvanic displacement reaction. The different surface morphology of the Ag mesoparticles was adjusted by changing the reaction time.In the growth system,the mesoparticle surface formed fluffy-spherical nanoprotrusions at longer reaction time. At the same time, we explored the growth mechanism of silver mesoparticles with different surface morphology. SERS measurements demonstrate that these Ag mesoparticles can serve as sensitive SERS substrates.At the same time, using finite element method, the distribution of the localized electromagnetic field near the particle surface was simulated to verify the enhanced mechanism. This study helps us to understand the relationship between morphology Ag mesoparicles and the properties of SERS.
Keywords:Ag mesoparticles; Surface enhanced Raman scattering; Enhancement factor; 4-MBA
 
 
 

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