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  • 03월 10일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제105회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Chemical properties of mass-selected clusters and nanoparticles in various environments

2010년 3월 27일 14시 38분 43초
목24B4심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 15시 : 30분
Royal Society of Chemistry 심포지움
저자 및
성균관대학교, Korea
Clusters consisting of less than ~ 100 atoms can show physical and chemical properties, which are significantly different from those of larger particles and bulk counterparts. Properties of clusters can be much altered with every additional atom. In this talk, interactions between oxygen and mass-selected clusters in the gas phase as well as deposited on surfaces will be discussed. For free Au clusters anions, only even numbered-clusters consisting of less than 21 atoms were found to be active for the O2 chemisorption at room temperature. A similar even-odd alteration of the O2 chemisorption reactivity was observed for Ag cluster anions. Photoemission spectroscopy could provide direct evidence on non-dissociative chemisorption of O2 on some coinage metal cluster anions. When the mass-selected Au clusters are deposited on solid surfaces, the significant size-selectivity of chemical properties can still be found. Au clusters with same sizes deposited on SiO2 and HOPG show dissimilar chemical properties, implying that deposition of mass-selected clusters on various substrates can provide a deeper insight into metal-support interactions. Nanoparticles consisting of more than several hundreds atoms behave differently from the respective bulk crystals. Oxidation and reduction behaviors of Au and Ag nanoparticles supported by silica and HOPG are sensitive to the particle size. Experiments using X-ray Photoelectron Spectroscopy can shed some light onto the size selectivity of chemical properties of nanoparticles smaller than ~ 10 nanometers in diameter. Oxide nanoparticles can be prepared using Atomic Layer Deposition (ALD). Size-dependent change in the photocatalytic activity of TiO2 nanostructures supported by C fiber will also be presented.