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Bergonzoni, C.,Libera, Dalla 대한전자공학회 1991 ICVC : International Conference on VLSI and CAD Vol.2 No.1
The hot carrier degradation in submicron LDD N-MOS transistors under static and dynamic procedures is studied. The involved physical mechanisms are characterized by means of a novel approach to the charge pumping measurements.
PS-PB-PS 삼블럭 공중합체 박막형판에서의 금의 자기응집에 의한 Nano - Scale 패턴형성
G . Kim,M . Libera 한국고무학회 1999 엘라스토머 및 콤포지트 Vol.34 No.1
N/A This paper describes how the gold particles self assemble on the specific phase on the microphase separated block copolymer thin film and form a well ordered patterns. For this study, polystyrene-polybutadiene-polystyrene(PS-PB-PS) triblock copolymer(30wt% PS) thin films (∼100㎚) having a cylindrical morphology were cast from 0.1wt% toluene solution to be used as polymer thin film templates. The films having either vertical PS cylinders or in-plane PS cylinders in PB matrix from each different solvent evaporation condition were obtained. Cross-sectional transmission electron microscopy(TEM) was used to study the surface and bulk morphologies of block copolymer thin films. Small amount of gold particles was evaporated on a block copolymer thin film template to obtain a nano-scale pattern. When an as-cast thin film template was used, gold particles preferentially self assemble on the low surface tension PB phase and a relatively well ordered pattern in nano-scale was produced. However, after the formation of a low surface energy PB rich layer upon annealing, a gold self-assembled pattern was not observed.
Shajkumar, Aruni,Nandan, Bhanu,Sanwaria, Sunita,Albrecht, Victoria,Libera, Marcin,Lee, Myong-Hoon,Auffermann, Gudrun,Stamm, Manfred,Horechyy, Andriy Academic Press 2017 Journal of Colloid and Interface Science Vol. No.
<P><B>Abstract</B></P> <P>Catalytically active Au@hollow-SiO<SUB>2</SUB> particles embedded in porous silica support (Au@hollow-SiO<SUB>2</SUB>@PSS) were prepared by using spherical micelles from poly(styrene)-<I>block</I>-poly(4-vinyl pyridine) block copolymer as a sacrificial template. Drastic increase of the shell porosity was observed after pyrolytic removal of polymeric template because the stretched poly(4-vinyl pyridine) chains interpenetrating with silica shell acted as an effective porogen. The embedding of Au@hollow-SiO<SUB>2</SUB> particles in porous silica support prevented their fusion during pyrolysis. The catalytic activity of Au@hollow-SiO<SUB>2</SUB>@PSS was investigated using a model reaction of catalytic reduction of 4-nitrophenol and reductive degradation of Congo red azo-dye. Significantly, to the best of our knowledge, Au@hollow-SiO<SUB>2</SUB>@PSS catalyst shows the highest activity among analogous systems reported till now in literature. Such high activity was attributed to the presence of multiple pores within silica shell of Au@hollow-SiO<SUB>2</SUB> particles and easy accessibility of reagents to the catalytically active sites of the ligand-free gold surface through the porous silica support.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>