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Development of Carbon Nanotube Based Reflection Type X-ray Source

100%
Choi H., Kim J., Lee C.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1078-1080
EN
X-ray imaging technology is a useful and leading medical diagnostic tool for health care professionals to diagnose disease in human body. Carbon nanotube based X-ray source, which we have developed in this study, could be also useful and supply integrated diagnostic X-ray imaging tool in diagnosis. Conventionally, thermionic type of tungsten filament X-ray tube is widely employed in the field of biomedical and industrial application fields. However, intrinsic problems, such as poor emission efficiency, low imaging resolution, and high electrical energy consumption etc., may cause the limitation of using the X-ray tube. To fulfill the current market requirement, specifically for medical diagnostic field, we have developed rather a portable and compact carbon nanotube based X-ray device in which microfocus high imaging resolution can be feasible.
2
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Synthesis, Structure, Photoluminescence, and Raman Spectrum of Indium Oxide Nanowires

88%
Kim H., Na H., Yang J., Lee, C., Kim H.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
143-145
EN
Production of indium oxide (In_2O_3) whiskers at a very low temperature of 650°C was reported. The synthetic route was comprised of a thermal heating process of a mixture of In and Mg powders. We have investigated the structural properties of the as-synthesized nanowires by using X-ray diffraction and scanning electron microscopy. The product consisted of one-dimensional nanowires, with a crystalline cubic structure of In_2O_3. The photoluminescence measurement with the Gaussian fitting exhibited visible light emission bands centered at 2.1 eV and 2.8 eV. The peaks of the Raman spectrum were indexed to the modes being associated with cubic In_2O_3.
3
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Photoluminescence Studies of Aluminum Nitride Nanowires

64%
Yang J., Na H., Kim H., Kebede M., Choi R., Jeong J., Lee C., Kim H.
Acta Physica Polonica A
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2011
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vol. 119
|
issue 2
125-127
EN
We report the production of AlN nanowires by the thermal heating method, for exploring their photoluminescence properties. The room-temperature photoluminescence properties were investigated with different annealing environment. While broad emissions with peaks at around 2.45 and 2.95 eV were obtained from both unannealed and annealed samples, the additional 2.1 eV peak was found from the annealed samples. We have suggested the possible emission mechanisms based on the assumption that both 2.45 eV peak and 2.1 eV peak are ascribed to the nitrogen vacancies. Annealing in N_2 environment exhibited lower intensities of 2.45 eV peak and 2.1 eV peak in comparison to those in Ar environment, presumably due to the suppression of nitrogen vacancies.
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