Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Optical Properties of Ag@Fe3O4 Core-Shell Nanoparticles

Ag@Fe3O4 코어-쉘 나노입자의 광학적 특성

  • Song, Younseong (Department of Cogno-Mechatronics Engineering, Pusan National University) ;
  • Koh, Kwangnak (Institute of General Education, Pusan National University) ;
  • Kim, Kyujung (Department of Cogno-Mechatronics Engineering, Pusan National University) ;
  • Lee, Jaebeom (Department of Cogno-Mechatronics Engineering, Pusan National University)
  • 송윤성 (부산대학교 인지메카트로닉스공학과) ;
  • 고광락 (부산대학교 교양교육원) ;
  • 김규정 (부산대학교 인지메카트로닉스공학과) ;
  • 이재범 (부산대학교 인지메카트로닉스공학과)
  • Received : 2017.01.09
  • Accepted : 2017.02.25
  • Published : 2017.06.25
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Abstract

In this paper, we investigate the optical properties of $Ag@Fe_3O_4$ nanoparticles (NPs) composed of a plasmonic core and a magnetic shell. As the $Fe_3O_4$ shell with high refractive index (~2.42) is formed on the surface of the silver NPs having diameter of 60 nm, the wavelength of the localized surface-plasmon resonance (LSPR) is shifted from 420 nm to 650 nm, a so-called "redshift". Furthermore, through the use of three simulation models ($Ag@Fe_3O_4$ NP, $Fe_3O_4$ shell NP, and silver NP), the peak at 410 nm is seen to be the result of scattering by the $Fe_3O_4$ shell with 60 nm thickness, which would be useful in comprehending the complex optics in various nanoscale assemblies using similar NPs.

본 논문에서는 플라즈모닉 코어와 자성 쉘로 구성된 $Ag@Fe_3O_4$ 나노입자의 흥미로운 광학적 특성에 대해 연구를 하였다. 기존의 60 nm의 지름을 갖는 은 나노입자의 표면에 높은 굴절률을 갖는 $Fe_3O_4$ 쉘이 형성됨에 따라 국소 표면 플라즈몬 공명(Localized surface plasmon resonance; LSPR) 파장이 420 nm에서 650 nm로 이동하는 red-shift 현상을 관찰 할 수 있었고, 또한, 세 가지 시뮬레이션 모델들 ($Ag@Fe_3O_4$ 나노입자, $Fe_3O_4$ 쉘 나노입자, 은 나노입자)을 통해서 410 nm 파장의 peak이 60 nm의 두께를 가진 $Fe_3O_4$ 쉘에 의해 발생하는 산란이 주된 원인이라는 것을 규명하였다. 이 결과는 비슷한 종류의 나노입자를 이용한 추후 다양하고 복잡한 나노어셈블리의 광학적 현상을 이해하는데 사용될 것이다.

Keywords

References

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