Nanoscale probing of interfaces between nanoparticles and support with atomic force microscopy = 원자 힘 현미경을 이용한 촉매 나노 입자와 지지체 계면의 나노 수준의 연구

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Shape control of metal nanocrystals has broad applications, including catalysis, plasmonics, and sensing. It was found that controlling the atomic arrangement on metal nanocrystal surfaces affects many properties, including the electronic dipole or work function. Tuning the surface structure of exposed facets of metal nanocrystals was enabled by shape control. We investigated the effect of shape on nanomechanical properties, including friction and adhesion forces. Two nanoparticles systems, cube nanocrystal (NC) with low-index were and hexoctahedral (HOH) NC with high-index (321) surface, were used as model nanoparticle surfaces. Scanning force microscopy was used to probe nanoscale friction and adhesion on the nanoparticle surface. Capping layers on the nanoparticle surface was removed via ethanol washing. While the adhesion on the nanoparticle with capping layer didn’t show shape dependence, after removal of capping layers, the cube Au NC exhibited the higher adhesion force compared to HOH Au NC. Because of the abundant presence of high-density atomic steps and kinks, high-index faceted nanoparticles have the more corrugated surface, than low-index nanoparticles, that results in the lower contact area, and thus lower adhesion. The study shows that the surface structure on the nanoparticle can be directly probed with adhesion and friction mapping with atomic force microscopy.
Advisors
Park, Jeong-Youngresearcher박정영
Description
한국과학기술원 : EEWS대학원,
Publisher
한국과학기술원
Issue Date
2014
Identifier
568721/325007  / 020123432
Language
eng
Description

학위논문(석사) - 한국과학기술원 : EEWS대학원, 2014.2, [ 5,51 p. ]

Keywords

Shape control; 표면 에너지; 원자 힘 현미경; 점착력; 마찰력; 형태 조절; nanocrystal; friction; adhesion; atomic force microscopy; surface energy; 나노 입자

URI
http://hdl.handle.net/10203/198067
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=568721&flag=dissertation
Appears in Collection
EEW-Theses_Master(석사논문)
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