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Highly Controlled Synthesis and Optical Properties of Cubic Plasmonic Nanostructures

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Authors

박정은

Advisor
남좌민
Major
자연과학대학 화학부
Issue Date
2018-02
Publisher
서울대학교 대학원
Keywords
plasmonicsAu nanocubecorner sharpnesscube-in-cube nanoparticlephotoluminescencesuper-radiant
Description
학위논문 (박사)-- 서울대학교 대학원 : 자연과학대학 화학부, 2018. 2. 남좌민.
Abstract
Plasmonics is a field of studying and exploiting extremely confined light using plasmonic materials, based on their strong light-matter interactions. When light is irradiated to a plasmonic nanomaterial with a dimension smaller than the wavelength of the light, the interaction between the metal with a large density of free electrons and light allows a resonant and coherent oscillation of electrons, which is referred as localized surface plasmon resonance (LSPR). LSPR endows plasmonic nanostructures with numerous unique and potent properties. Among many plasmonic metal nanostructures, anisotropic metallic nanocubes are plasmonically and chemically promising. However, gold nanocubes have not been widely utilized mainly due to the lack of methods for fine structural tuning and high-yield synthesis that allow reliable generation of plasmonic properties. For useful employment, high-yield synthesis of plasmonic nanostructures with precise structural controllability is of great importance with their LSPR properties primarily depending on their morphology.
This thesis presents progress in understanding and controlling the synthesis of cubic plasmonic nanostructures, and modulating and/or enhancing their optical properties. I first introduce basics of metal-based plasmonics, a synthesis, and photoluminescence of plasmonic nanostructures. Next, I present a synthetic strategy to form gold nanocubes with controlled structure (particularly, cube size and corner sharpness) in a very high yield. The strategy is based on fine tuning of surface-protecting agents during shape evolution and following flocculation process to maximize the synthetic yield. Remarkably, single-particle far-field and near-field results show that each of synthesized cubes can scatter light in a highly reproducible and controllable manner. Furthermore, plasmonic cube-in-cube nanoparticles with a controllable interior nanogap were synthesized. They have shown the highest PL intensity and quantum yield ever reported for metallic nanostructures. We proposed the super-radiant mechanism for photoluminescence enhancement of metal nanostructures for the first time and based on the plasmon hybridization theory, the optical properties of the cube-in-cube were analyzed.
Language
English
URI
https://hdl.handle.net/10371/141176
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