Browsing by Author "Tang, Jan"

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Photoinduced Structural Dynamics in Laser-Heated Nanomaterials of Various Shapes and Sizes
(2008-11-06)
Yu, Pyng
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Tang, Jan
;
Lin, Sheng-Hsien
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應用化學系
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Department of Applied Chemistry
We examined photoinduced ultrafast structural dynamics such as coherent acoustic waves in many shapes of fcc metallic nanomaterials. Experimental data of nanosized thin films, prisms, spheres, rods, disks and pyramids from transient optical absorption/reflectance measurements were analyzed based on a combined Fermi-Pasta-Ulam model and two-temperature model. This work elucidates the structural dynamics induced by femtosecond laser heating, its size and shape effects on the period and phase of the excited acoustic phonon modes.
Synthesis of Silver Nanoprisms and Nanodiscs an Applications in Fluorescence Blinking Suppression
(2010)
Yu, Pyng
;
Huang, Jane
;
Yuan, Chi-Tsu
;
Tang, Jan
;
光電工程學系
In this work we investigated the influence of reagents in the synthesis of triangular silver nanoprisms through direct chemical reduction. We identified the chemical role of each reagent, i e H(2)O(2), poly(vinylpyrrolidone) (PVP) and NaBH(4), by systematically varying one reagent concentration while keeping the concentration of other reagents constant We also discuss the applications of nanoprisms in blinking suppression of single semiconductor quantum dots. In addition, we also investigated the synthesis of silver nanodiscs through the reconstruction of triangular nanoprisms using halide ions. The results from different halide ions presented the different face-selective etching rates on the well-identified facet in the silver nanoprism.