Design of heterostructured metal-semiconductor nanocrystal photocatalysts for enhanced photocatalytic efficiency = 광촉매 효율 향상을 위한 금속 및 반도체 이종나노구조 입자 설계

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Inorganic nano-semiconductors including quantum dots and metal oxides have bandgap energies that can absorb the entire range of sunlight. Their applications to photocatalysis have been actively studied. However, when these inorganic materials are employed alone, it is difficult to achieve the desired level of efficiency in the application. In this thesis, it was tried to study the synthesis and design of heterostructured nanocrystals between various material combinations suitable for applying them to photocatalysts. Heterojunctions between various inorganic nanomaterials were investigated, thereby improving photocatalytic activities or optical properties. First, potential of amorphous $TiO_2$, which is not well used due to the trap of charges, was studied as a photocatalyst. It was revealed that thin layer of $TiO_2$ on quantum dots facilitates release of electrons for $H_2$ production. Next, we proved that junction of $TiO_2$ and CuPt alloy catalysts contributed to improved selectivity and efficiency of $CH_4$ in $CO_2$ conversion. Small size of CuPt nanoparticles exposed facets on which carbon dioxide could be efficiently adsorbed, which was confirmed by molecular simulation. Finally, heterojunctions between quantum dots by cation exchange were investigated. During cation exchange, defect can be produced due to residual cations. New cation exchange method was designed using metal-ligand interaction, which improved optical properties of heterostructures. This study is expected to be used as a new synthesis method of blue-emitting quantum dots, which is an issue in light emitting diodes. This thesis provides insight on design of the heterostructure nanocrystals. The synthetic method that we developed has a positive effect on application to enhanced photocatalysis and light emitting diode.
Advisors
Lee, Doh Changresearcher이도창researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2019.2,[vii, 82 p. :]

Keywords

photocatalyst▼ainorganic nanomaterial▼aheterojunction▼aheterostructure▼aquantum dots▼ametal oxide; 광촉매▼a무기나노소재▼a이종접합▼a이종나노구조▼a양자점▼a금속 산화물

URI
http://hdl.handle.net/10203/264871
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=842116&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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