Surface structure design of metal oxide nanostructures for highly effective gas sensors and catalysts = 고성능 기체 센서 및 촉매 활용을 위한 금속 산화 나노구조체의 표면 구조 디자인

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The nanoparticles have been employed for various applications, such as catalytic reactions, sensors, and drug delivery systems, due to their high surface area and highly active surface. For these applications, researchers have great interest in the design of morphology and surface structure of nanoparticles to gain large surface area, adoptable electronic conductance and surface energies. In chapter 2, a hierarchical assembly of the single crystalline $Co_3O_4$ nanoparticles was yield using ZnO spheres as sacrificial templates. This material exhibited remarkable sensing performance, including extremely high sensitivity with a detection limit of 5 ppb, good selectivity for formaldehyde among the various indoor environmental gases, and good long term stability for up to three days in air. These superior properties stemmed from the regular, hierarchically assembled structures with a small crystalline domain size under a critical size of a grain (20 nm), a thin hollow morphology with a large surface area, and a three-dimensional conductive network with a two particle-wide diameter. In chapter 3, we have fabricated two distinct yolk-shell nanostructures from the $NiPt@SiO_2$ core-shell nanoparticles by simple thermal treatments. The labile nickel components behaved as sacrificial spacers that generated vacancy between Pt cores and silica hollow shells. The $NiPt@SiO_2$ core-shell nanoparticles transformed to the Pt@silica yolk-shell nanostructure with branches of nickel phyllosilicate under a basic condition. Hydrochlo-ric acid selectively dissolved the nickel components and formed the Pt@silica yolk-shell nanospheres. Because of its high reactivity and affordable price, nickel can act as a versatile sacrificial component for the formation of complex hierarchical structures with expensive noble metals. In chapter 4, we have fabricated a $SiO_2@MgO@Ni$ nanocatalyst bearing tiny nickel nanoparticles embedded on the surface of $SiO_2@MgO$ core-shell sphere, by the red...
Advisors
Song, Hyun-Joonresearcher송현준
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
591880/325007  / 020088083
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2014.8, [ 90 p. ]

Keywords

nanostructure; 나노입자; 기체반응촉매; 기체센서; 나노구조체; nanoparticle; gas sensor; gas catalyst

URI
http://hdl.handle.net/10203/196472
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=591880&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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