Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Biological Synthesis of Au Core-Ag Shell Bimetallic Nanoparticles Using Magnolia kobus Leaf Extract

목련잎 추출액을 이용한 Au Core-Ag Shell 합금 나노입자의 생물학적 합성

  • 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)
  • Received : 2009.09.24
  • Accepted : 2009.12.10
  • Published : 2010.02.28
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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.

목련잎 추출액을 이용하여 Au core-Ag shell 합금 나노입자를 합성하였다. 환원제인 식물잎 추출액을 먼저 $HAuCl_4$ 용액과 반응시키고 다음에 $AgNO_3$ 용액과 반응시켜 금 seed와 은 shell을 형성시켰다. 반응시간에 따른 UV-visible spectroscopy의 변화를 모니터링하여 합금 나노입자의 형성을 관찰하였다. 합성된 합금 나노입자를 transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS), X-ray photoelectron spectroscopy(XPS) 등으로 특성화 하였다. TEM image로부터 관찰된 합금 나노입자는 삼각형, 오각형, 육각형 등의 평판과 구 구조의 혼합물이었다. EDS와 XPS 분석으로부터 결정된 금/은 합금 나노입자의 원자 은 함량은 각각 34와 65 wt%로 Au core-Ag shell 나노구조가 형성되었음을 알 수 있었다. 이러한 core-shell 형태의 나노구조는 표면 강화 라만 분광 및 생물분자의 고감도 검출 등에 잠재적인 응용이 기대된다.

Keywords

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