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98 results on '"Wong, Ming Show"'

54. Combined effects of argon addition and substrate bias on the formation of nanocrystalline diamond films by chemical vapor deposition.

Author

Yang, Tien-Syh, Lai, Jir-Yon, Wong, Ming-Show, and Cheng, Chia-Liang

Subjects
THIN films, DIAMONDS, ARGON, CHEMICAL vapor deposition
Abstract

The article reports combined effects of Ar addition and substrate bias on the grain size, microstructure, and growth rate of the diamond films prepared in microwave plasma-enhanced chemical vapor deposition. The nanocrystalline diamond (NCD) films with grain size of 50-100 nm, characterized by Raman spectra, scanning and transmission electron microscopy, were produced at 90-99 vol% Ar concentration under -50 V substrate biasing. The growth rate of the NCD films was 0.7-0.8 μm h[SUP-l], larger apparently than those grown by only Ar addition or by substrate bias effect alone. The NCD formation by various mechanisms is discussed, and a revised C[SUB2] insertion mechanism by the promotion of H[SUP+] ions is proposed to interpret the higher growth rate of the NCD films. [ABSTRACT FROM AUTHOR]

Published
2002
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55. Substrate bias effect on the formation of nanocrystalline diamond films by microwave plasma-enhanced chemical vapor deposition.

Author

Yang, Tien-Syh, Lai, Jir-Yon, Wong, Ming-Show, and Cheng, Chia-Liang

Subjects
LIQUID crystal films, PLASMA-enhanced chemical vapor deposition, MICROCRYSTALLINE polymers
Abstract

The influence of negative substrate bias on the crystallinity, morphology, and growth rate of the diamond films deposited using microwave plasma-enhanced chemical vapor deposition in 1% CH[sub 4]/H[sub 2] plasma were investigated. The nanocrystalline diamond films were produced exclusively under the biasing at -250 V. With -50 V biasing, faceted (111) microcrystalline diamond films at higher growth rate than no-bias samples were produced. When the biasing between - 100 and -200 V, faceted (100) diamond films with decreasing grain size were favored, and the growth rates were gradually reduced along with the increasing biasing. The results indicate that the etching efficiency of H[sup +] ions is enhanced with the increasing kinetic energy obtained from the increasing bias voltage. On the other hand, CH[sup +, sub x] ions at -250 V biasing would have sufficient energy to perform the ion subplantation model to grow the nanocrystalline diamond films by bias-enhanced nucleation. [ABSTRACT FROM AUTHOR]

Published
2002
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56. Nano-indentation studies of ultrahigh strength carbon nitride thin films.

Author

Li, Dong, Chung, Yip-Wah, Wong, Ming-Show, and Sproul, William D.

Subjects
THIN films, CARBON, NITRIDES, ATOMS
Abstract

Discusses a study that presented results of detailed nanoindentation studies of CN[subx] films prepared under a wide range of conditions. Description of carbon nitride thin films; Techniques that failed in synthesizing crystalline B-C[sub3]N[sub4]; Strategies to promote the crystalline; Area in which surface mobility of atoms may be enhanced.

Published
1993
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59. Preface: the Biennial TACT International Thin Films Conference (TACT 2015)

Author

Huang, Jia-Hong, primary, Chang, Li, additional, Chu, Jinn P., additional, Hsieh, Jang-Hsing, additional, Huang, Bohr-Ran, additional, Lin, Ming-Tzer, additional, Liu, Chuan-Pu, additional, Shen, Yu-Lin, additional, Ting, Jyh-Ming, additional, Wong, Ming-Show, additional, Wu, Jih-Jen, additional, and Yang, Yung-Chin, additional

Published
2016
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96. Characterization of indirect and direct interband transitions of anatase TiO2 by thermoreflectance spectroscopy.

Author

Ho, Ching-Hwa, Tsai, Ming-Cheng, and Wong, Ming-Show

Subjects
TITANIUM dioxide films, TEMPERATURE control, ENERGY transfer, ANISOTROPY, REFLECTANCE spectroscopy, MATERIALS science
Abstract

We characterize three as-deposited anatase TiO2 (a-TiO2) films with different deposition flux angles of 0°, 53°, and 86° tilted to Si <001> using thermoreflectance (TR) measurement in the temperature range between 30 and 300 K. The TR spectra at low temperature clearly show considerable difference in interband transitions of the tetragonal a-TiO2 with the largely top plane of {001} or the largely side planes of {100} and {010}. The indirect and direct interband transitions of the a-TiO2 are evaluated. The temperature dependences of the interband transition energies of the a-TiO2 are analyzed. The optical-axial anisotropy of the a-TiO2 films is discussed. [ABSTRACT FROM AUTHOR]

Published
2008
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98. Visible-light-responsive nano-TiO(2) with mixed crystal lattice and its photocatalytic activity.

Author

Tseng YH, Kuo CS, Huang CH, Li YY, Chou PW, Cheng CL, and Wong MS

Abstract

Ultraviolet- and visible-light-responsive titania-based photocatalysts were synthesized and employed in the photocatalytic oxidation of NO(x). Sol-gel processes using tetrabutyl orthotitanate and ethanol under acid catalyzed condition and controlled calcination were performed to synthesize titanium dioxide with a mixed crystal lattice of anatase, brookite and rutile phases. The TiO(2) prepared under calcination at 200 °C exhibited high photocatalytic activity for degradation of NO(x) under both ultraviolet (UV) and visible-light illumination. The experimental results showed that up to 70% removal of NO(x) could be obtained in a continuous flow type reaction system under irradiation with visible light. The calcination temperature has an important influence on the particle size and lattice structure of TiO(2). It is also found that the peculiar mixed-phase structure of TiO(2), evidenced from Raman, x-ray diffractometry (XRD), and UV-vis spectroscopy, was inferred to be an important factor for visible-light absorption and NO(x) removal activity under a wide range of visible-light illumination.

Published
2006
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