Ag@Fe3O4 코어-쉘 나노입자의 광학적 특성
Optical Properties of Ag@Fe3O4 Core-Shell Nanoparticles
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본 논문에서는 플라즈모닉 코어와 자성 쉘로 구성된 Ag@Fe3O4 나노입자의 흥미로운 광학적 특성에 대해 연구를 하였다. 기존의 60 nm의 지름을 갖는 은 나노입자의 표면에 높은 굴절률을 갖는 Fe3O4 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@Fe3O4 나노입자, Fe3O4 쉘 나노입자, 은 나노입자)을 통해서 410 nm 파장의 peak이 60 nm의두께를 가진 Fe3O4 쉘에 의해 발생하는 산란이 주된 원인이라는 것을 규명하였다. 이 결과는 비슷한 종류의 나노입자를 이용한추후 다양하고 복잡한 나노어셈블리의 광학적 현상을 이해하는데 사용될 것이다.
Abstract
In this paper, we investigate the optical properties of Ag@Fe3O4 nanoparticles (NPs) composed of a plasmonic core and amagnetic shell. As the Fe3O4 shell with high refractive index (~2.42) is formed on the surface of the silver NPs having diameterof 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@Fe3O4 NP, Fe3O4 shell NP, and silver NP), the peakat 410 nm is seen to be the result of scattering by the Fe3O4 shell with 60 nm thickness, which would be useful in comprehendingthe complex optics in various nanoscale assemblies using similar NPs.
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