Browsing by Author "Chiu, H. T."

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EELS plasmon studies of silver/carbon core/shell nanocables prepared by simple arc discharge
(2007-04-01)
Wang, L. S.
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Buchholz, D. B.
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Li, Y.
;
Li, J.
;
Lee, C. Y.
A method for the fabrication of large quantities of high quality silver nanocables encapsulated in carbon nanotubes (Ag@C) using a hydrogen arc is presented. A growth mechanism based on the generation of poly-aromatic hydrocarbons by the hydrogen arc is proposed. The size-dependent electronic structures of the resultant materials are investigated using electron energy loss spectroscopy (EELS). The surface plasmon and bulk-excitation character observed by EELS are discussed. As the diameter of Ag@C nanocable decreases, the surface and bulk plasmons of the silver core shift to lower energy and the peaks broaden. Measurements of electrical conductivity exhibits a liner current-voltage character with a conductivity of 0.5x10(4) S/cm for the nanocable structure.
Synthesis of porous micro-sized titania cages and their photocatalytic property
(2013-12-16)
Tsai, M. -C.
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Yang, M. -H.
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Chang, Y. -W.
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Tzeng, J. -K.
;
Lee, C. -Y.
Micro-sized TiO2 cage consisted of anatase nanopartides on the edges of each cube, was synthesized using TTIP as the reagent and NaF submicrometer sized cubes as the template. When a salt of cube was adopted as the template, the reactants prefer to grow on the active sites, edges and corners of the cube, after removing the NaF template, the skeleton of the cube remain as the cage-shaped materials. The hierarchical structures with nano-sized anatase particles and micro scaled cage architecture markedly enlarge the surface area and enhance the light harvesting by light scattering of TiO2 frame, resulting in great photo-catalytic performance, which leads to the photo-degradation of methylene blue by 40% higher than that was achieved by crushed nanoparticles. (C) 2013 Elsevier B.V. All rights reserved.