Browsing by Author "Chung, Yao-An"

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Intercrossed Sheet-Like Ga-Doped ZnS Nanostructures with Superb Photocatalytic Actvitiy and Photoresponse
(2009-07-23)
Lu, Ming-Yen
;
Lu, Ming-Pei
;
Chung, Yao-An
;
Chen, Ming-Jer
;
Wang, Zhong Lin
Intercrossed ZnS nanostructures doped with Ga (ZnS:Ga nanowalls) have been synthesized in high yield from mixed powders in a vacuum furnace. ZnS:Ga nanowalls were grown vertically on the substrate with the size in the range of several micrometers and the thickness down to similar to 15 nm and have very rough edges. Due to the high surface area and distinctive morphology of ZnS:Ga nanowalls, the photocatalytic activity and the photoresponse show superior properties compared to ZnS:Ga films. The increased conductivity of metal-semiconductor-metal (Ag-ZnS:Ga nanowalls-Ag) Schottky photodetectors under light illumination is attributed to the photogenerated electron-hole pairs, the desorption of oxygen molecules on the ZnS:Ga surface, and the lowering of the Schottky barrier height. The results indicate that ZnS:Ga nanowalls are promising candidate materials for photocatalysts and applicable as photodetectors, optical switches, and sensors in the visible light region.
Reactive template assisted growth of one-dimensional nanostructures of titanium dioxide
(2006-12-10)
Chung, Yao-An
;
Lee, Chi-Young
;
Peng, Chih-Wei
;
Chiu, Hsin-Tien
;
材料科學與工程學系
TiCl4 was employed to react with the reactive template Na@AAO, Na inside the channels of anodic aluminum oxide membranes, followed by O-2 oxidation at 623 K and annealed at 723 and 873 K to form one-dimensional nanostructures of TiO2. Free standing polycrystals of anatase TiO2 (diameter = 200-400 nm, length = 60 mu m) were obtained after the template was removed. (c) 2006 Elsevier B.V. All rights reserved.