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Biological Synthesis of Au Core-Ag Shell Bimetallic Nanoparticles Using Magnolia kobus Leaf Extract  

Song, Jae Yong (Department of Chemical Engineering, College of Engineering, Chungbuk National University)
Kim, Beom Soo (Department of Chemical Engineering, College of Engineering, Chungbuk National University)
Publication Information
Korean Chemical Engineering Research / v.48, no.1, 2010 , pp. 98-102 More about this Journal
Abstract
Magnolia kobus leaf extract was used for the synthesis of bimetallic Au core-Ag shell nanoparticles. Gold seeds and silver shells were formed by first treating aqueous solution of $HAuCl_4$ and then $AgNO_3$ with the plant leaf extract as reducing agent. UV-visible spectroscopy was monitored as a function of reaction time to follow the formation of bimetallic nanoparticles. The synthesized bimetallic nanoparticles were characterized with transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS), and X-ray photoelectron spectroscopy(XPS). TEM images showed that the bimetallic nanoparticles are a mixture of plate(triangles, pentagons, and hexagons) and spherical structures. The atomic Ag contents of the bimetallic Au/Ag nanoparticles determined from EDS and XPS analysis were 34 and 65 wt%, respectively, suggesting the formation of bimetallic Au core-Ag shell nanostructure. This core-shell type nanostructure is expected to have potential for application in surface enhanced Raman spectroscopy and in the sensitive detection of biomolecules.
Keywords
Biological Synthesis; Nanoparticles; Au Core-Ag Shell; Plant Extract; Magnolia kobus;
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Times Cited By KSCI : 3  (Citation Analysis)
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