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Your search keyword '"Shih, Wen-Ching"' showing total 144 results
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144 results on '"Shih, Wen-Ching"'

23. Theoretical investigation of the SAW properties of ferroelectric film composite structures

Author

Shih, Wen-Ching and Wu, Mu-Shiang

Subjects
Ferroelectric devices -- Usage, Acoustic surface waves -- Analysis, Perovskite -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Perovskite-type ferroelectric film can be utilized in ultra-high capacity dynamic random access memories, infrared detectors, surface acoustic waves devices and optical waveguide device applications. This ferroelectric film is effective in these applications because of its dielectric, ferroelectric, pyroelectric, piezoelectric, electro-optic and acousto-optic properties. The ferroelectric film also features a surface acoustic waves characteristic which is useful in the integration of various devices in the similar substrate.

Published
1998

24. Direct observation and mechanism of increased emission sites in Fe-coated microcrystalline diamond films.

Author

Panda, Kalpataru, Sundaravel, B., Panigrahi, B. K., Huang, Pin-Chang, Shih, Wen-Ching, Chen, Huang-Chin, and Lin, I-Nan

Subjects
EMISSION spectroscopy, MICROCRYSTALLINE polymers, DIAMOND films, FIELD emission, SCANNING tunneling microscopy
Abstract

The electron field emission (EFE) properties of microcrystalline diamond (MCD) films are significantly enhanced due to the Fe coating and post-annealing processes. The 900 °C post-annealed Fe coated diamond films exhibit the best EFE properties, with a turn on field (E0) of 3.42 V/μm and attain EFE current density (Je) of 170 μA/cm2 at 7.5 V/μm. Scanning tunnelling spectroscopy (STS) in current imaging tunnelling spectroscopy mode clearly shows the increased number density of emission sites in Fe-coated and post-annealed MCD films than the as-prepared ones. Emission is seen from the boundaries of the Fe (or Fe3C) nanoparticles formed during the annealing process. In STS measurement, the normalized conductance dI/dVI/V versus V curves indicate nearly metallic band gap, at the boundaries of Fe (or Fe3C) nanoparticles. Microstructural analysis indicates that the mechanism for improved EFE properties is due to the formation of nanographite that surrounds the Fe (or Fe3C) nanoparticles. [ABSTRACT FROM AUTHOR]

Published
2012
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25. The induction of a graphite-like phase on diamond films by a Fe-coating/post-annealing process to improve their electron field emission properties.

Author

Huang, Pin-Chang, Shih, Wen-Ching, Chen, Huang-Chin, and Lin, I-Nan

Subjects
*FIELD emission, *CARBON, *MICROMECHANICS, *NANOTUBES, *APPROXIMATION theory
Abstract

The electron field emission (EFE) process for diamond films was tremendously enhanced by Fe-coating and post-annealing processes. Microstructural analysis indicates that the mechanism for the improvement in the EFE process is the formation of nanographites with good crystallinity that surround the Fe (or Fe3C) nanoclusters. Presumably the nanographites were formed via the reaction of Fe clusters with diamond films, viz. by the dissolution of carbons into Fe (or Fe3C) clusters and the reprecipitation of carbon species to the surface of the clusters, a process similar to the growth of carbon nanotubes via Fe clusters as catalyst. Not only is a sufficiently high post-annealing temperature (900°C) required but also a highly active reducing atmosphere (NH3) is needed to give a proper microstructure for enhancing the EFE process. The best EFE properties are obtained by post-annealing the Fe-coated diamond films at 900°C in an NH3 environment for 5 min. The EFE behavior of the films can be turned on at E0 = 1.9 V/μm, attaining a large EFE current density of 315 μA/cm2 at an applied field of 8.8 V/μm (extrapolation using the Fowler-Nordheim model leads to Je = 40.7 mA/cm2 at a 20 V/μm applied field). [ABSTRACT FROM AUTHOR]

Published
2011
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