Synthesis of assembled noble metal nanostructures for enhancing plasmonic performance with catalytic activity and study on their physicochemical characteristics = 촉매 활성과 플라즈모닉 성능 향상을 위한 조립된 귀금속 나노구조체 합성 및 물리화학적 특성 연구

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Noble metal nanoparticles (NPs) have been drawn tremendous interests due to their superior plasmonic and catalytic functions compared to other metal nanoparticles. In this regard, they have been widely explored for various applications including electrocatalysts, bio/chemical/environmental sensor, photothermal therapy, organic photovoltaics, photocatalysts and surface-enhanced Raman scattering (SERS) spectroscopy. Among the noble metal NPs, Au NPs have attracted research interests as plasmonic platforms due to their inherent structural stability and localized surface plasmon resonance (LSPR) properties. Manipulation of the LSPR properties of Au NPs is the most critical issue in developing plasmonic platforms. One straightforward way for enhancing plasmonic performance is the assembly of NPs. Accordingly, there are numerous assembly strategies such as charge interaction, van der Walls force and surfactant or DNA mediated assembly of NPs. In this study, I have employed a new route towards assembly of nanoparticle, which called nanoparticle clusters, through controlled galvanic replacement of nanoparticles to enhance the plasmonic performance of nanostructures. The prepared Au NPCs showed enhanced SERS activity compared to Au nanoparticles due to their interparticle gaps, which can induce the strong electromagnetic field enhancement. Even single-molecule SERS events could be detected with the Au NPCs. Also, I developed a new synthetic strategy for assembly of core-shell nanoparticles with plasmonic cores and catalytically active shells is reported for the first time. The prepared Au@M (M= Ag, Pd or Pt) NPCs showed remarkably enhanced plasmonic performance compared to their Au@M nanoparticle counterparts. In situ real-time SERS monitoring of the progress of a catalytic reaction proceeded on the surface of the NPCs indicated that the controlled assembly of core-shell nanoparticles is an effective strategy for integrating plasmonic and catalytic functions in a single platform. I envision that this novel concept of assembly strategy will pave a new way to developing efficient plasmonic and catalytic nanomaterials and that it can be extended to the fabrication of a new class of hybrid nanoarchitectures with unprecedented morphologies and functions
Advisors
Han, Sang Wooresearcher한상우researcher
Description
한국과학기술원 :화학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2017.8,[v, 65 p. :]

Keywords

assembly▼asurface plasmon▼acatalysis▼asurface-enhanced raman scattering▼ametal nanoparticle cluster; 어셈블리▼a표면 플라즈몬▼a촉매반응▼a표면 증강 라만 산란▼a금속 나노입자 클러스터

URI
http://hdl.handle.net/10203/265522
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=866991&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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