Browsing by Author "Tseng, Shih-Chun"

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Enhancement of the field emission properties of low-temperature-growth multi-wall carbon nanotubes by KrF excimer laser irradiation post-treatment
(2006-11-01)
Li, Chia-Hung
;
Liu, Han-Chi
;
Tseng, Shih-Chun
;
Lin, Yi-Ping
;
Chen, Shih-Pu
Multi-wall carbon nanotube (CNT) films were fabricated by microwave plasma chemical vapor deposition at low temperatures (similar to 500 degrees C). The films when properly post-treated by laser irradiation exhibited a factor of 2-3 enhancement in the emission cur-rent, while the turn-on field (E-on) was reduced from 4.89-5.22 to 2.88-3.15 V/mu m. The introduction of excessive oxygen during laser irradiation, however, degrades the performance of field emission properties drastically. Raman spectroscopy measurements revealed the intimate correlation between the parameter I-D/I-G (intensity ratio between the two representative Raman peaks seen in carbon nanotubes) and the field emission performance. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses showed that the irradiation-induced modification of the tube morphology and crystallinity might be responsible for the observations. (c) 2006 Elsevier B.V. All rights reserved.
Observation of Growth of Human Fibroblasts on Silver Nanoparticles
(2007)
Wen, Hua-Chiang
;
Lin, Yao-Nan
;
Jian, Sheng-Rui
;
Tseng, Shih-Chun
;
Weng, Ming-Xiang
Silver nanoparticles have drawn extensive attention as biomaterial components. Human fibroblasts were grown on various concentrations of silver nanoparticles during the period observation. Normal viability (0% silver particles) was increased from 6 to 72 hours, increasing the amount of human fibroblasts (1.5x10(4) to 7x10(6) cells/well) normally. Nevertheless, at higher concentrations of silver nanoparticles (50%) 1.11x10(5) cells/well remained after 72 hours. Results indicated that the increase in the concentration of silver nanoparticles reduced the number of fibroblasts and affected their fission. Silver nanoparticles were found under the membranes of fibroblast following dry treatment. The number of tissues declined because the silver nanoparticles interrupted the fission mechanism during their development in vivo.