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Tanso 207 - Abstracts
Carbon 41 (2003) 2457–2458
Tanso 207 – Abstracts Conduction Electron Spin Resonance of Potassiumdoped Graphite by Noboru Akuzawa, Masashi Yamashita and Natsuko Wachi Tokyo National College of Technology, 1220 -2 Kunugida, Hachioji-shi, Tokyo 193 -0997, Japan The conduction electron spin resonance of potassiumdoped graphite (KC x ) was carried out. The g value of KC 200 was determined to be 2.0060 at room temperature, which was the same as that of host graphite. On the other hand, the g values of KC x samples (96$x$8) were determined to be around 2.002. The X-ray diffraction measurement of KC 200 showed that no clear stage structure was realized in contrast to those of the other KC x samples. [TANSO 2003 (No.207) 65–66]
Introduction to Electronic Structure Calculation of Nano-Carbon by Riichiro Saito Department of Physics, Tohoku University and CREST JST: Aoba-ku, Sendai 980 -8578, Japan We introduce some calculation methods for structure and electronic structure of various carbon materials. Some experimental spectra of Raman spectroscopy, infrared absorption, STS and STM can be directly compared with the calculated results. [TANSO 2003 (No.207) 67–72]
This paper elaborates on an electrochemical measurement system using a personal computer for development of carbon anode materials for a Li ion secondary battery. Some analysis methods for the data obtained by the system are explained. Theoretical investigations on the electrochemical properties of carbon nanotubes are also reviewed. [TANSO 2003 (No.207) 73–77]
Use of Computer Analysis for X-ray Diffraction Data by Norio Iwashita National Institute of Advanced Industrial Science and Technology: 16 -1, Onogawa, Tsukuba, Ibaraki 305 -8569, Japan X-ray diffraction techniques have been widely applied for crystal structure characterization of carbon materials and give useful information. Progresses in computers have been remarkable, which make the measurement of diffraction intensities and their corrections on different factors easier. It was pointed out, therefore, that the procedures for X-ray diffraction measurements have to be revised so as to take account of this progress in computation. In the present paper, computer analysis of digital X-ray diffraction data, for instance, determination of lattice constants and crystallite size of carbon materials (Gakushin method) using a profile fitting technique and calculation of integral intensity in the case of estimation of graphitization degree P1 are reviewed. The measurement conditions to obtain a good digital diffraction data, the procedures of smoothing and intensity correction of diffraction profile are introduced. [TANSO 2003 (No.207) 78–86]
Personal Computer Aided Development of Carbon Anode Materials for Li Ion Secondary Battery by Shinji Kawasaki Faculty of Textile Science and Technology, Shinshu University: 3 -15 -1 Tokida, Ueda 386 -8567, Japan
Production and Application of Carbon Nanotubes by Daisuke Kasuya* and Masako Yudasaka**
* Nanotube Technology Center, Fundamental Research
0008-6223 / 03 / $ – see front matter 2003 Published by Elsevier Science Ltd. doi:10.1016 / S0008-6223(03)00208-2
2458
Laboratories, NEC Laboratories: Tsukuba, Ibaraki 305 -8501, Japan
Tanso 207 – Abstracts 41 (2003) 2457 – 2458
34
Miyukigaoka,
** Nanotubulites Project, JST-ICORP: c /o NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305 -8501, Japan Single-wall carbon nanotubes (SWNTs) have unique structures with diameters of nanometer scale and length of micrometers or longer. Their properties are interesting; for example, high tensile strength and electrical properties of both semiconductors and metals depending on their structural symmetries. However, their production methods have not been well established. In this review, the methods of formation, purification, and purity estimation of SWNTs
are introduced. We also introduce single-wall carbon nanohorns (SWNH) that have SWNT-like structures and usually form spherical aggregates with diameters of 80| 100 nm. Two types of SWNH aggregates are known, dahlia and bud types. They are produced by CO 2 laser ablation at room temperature. Dahlia and bud types of SWNH aggregates are produced with purities of 90% and 70%, respectively. Among SWNH properties, gas adsorption phenomena are interesting. For example, specific surface area increases from about 300 m 2 / g to 1000 m 2 / g by treating in oxygen gas at 420 8C.
[TANSO 2003 (No.207) 87–93]
Tanso 207 – Abstracts Conduction Electron Spin Resonance of Potassiumdoped Graphite by Noboru Akuzawa, Masashi Yamashita and Natsuko Wachi Tokyo National College of Technology, 1220 -2 Kunugida, Hachioji-shi, Tokyo 193 -0997, Japan The conduction electron spin resonance of potassiumdoped graphite (KC x ) was carried out. The g value of KC 200 was determined to be 2.0060 at room temperature, which was the same as that of host graphite. On the other hand, the g values of KC x samples (96$x$8) were determined to be around 2.002. The X-ray diffraction measurement of KC 200 showed that no clear stage structure was realized in contrast to those of the other KC x samples. [TANSO 2003 (No.207) 65–66]
Introduction to Electronic Structure Calculation of Nano-Carbon by Riichiro Saito Department of Physics, Tohoku University and CREST JST: Aoba-ku, Sendai 980 -8578, Japan We introduce some calculation methods for structure and electronic structure of various carbon materials. Some experimental spectra of Raman spectroscopy, infrared absorption, STS and STM can be directly compared with the calculated results. [TANSO 2003 (No.207) 67–72]
This paper elaborates on an electrochemical measurement system using a personal computer for development of carbon anode materials for a Li ion secondary battery. Some analysis methods for the data obtained by the system are explained. Theoretical investigations on the electrochemical properties of carbon nanotubes are also reviewed. [TANSO 2003 (No.207) 73–77]
Use of Computer Analysis for X-ray Diffraction Data by Norio Iwashita National Institute of Advanced Industrial Science and Technology: 16 -1, Onogawa, Tsukuba, Ibaraki 305 -8569, Japan X-ray diffraction techniques have been widely applied for crystal structure characterization of carbon materials and give useful information. Progresses in computers have been remarkable, which make the measurement of diffraction intensities and their corrections on different factors easier. It was pointed out, therefore, that the procedures for X-ray diffraction measurements have to be revised so as to take account of this progress in computation. In the present paper, computer analysis of digital X-ray diffraction data, for instance, determination of lattice constants and crystallite size of carbon materials (Gakushin method) using a profile fitting technique and calculation of integral intensity in the case of estimation of graphitization degree P1 are reviewed. The measurement conditions to obtain a good digital diffraction data, the procedures of smoothing and intensity correction of diffraction profile are introduced. [TANSO 2003 (No.207) 78–86]
Personal Computer Aided Development of Carbon Anode Materials for Li Ion Secondary Battery by Shinji Kawasaki Faculty of Textile Science and Technology, Shinshu University: 3 -15 -1 Tokida, Ueda 386 -8567, Japan
Production and Application of Carbon Nanotubes by Daisuke Kasuya* and Masako Yudasaka**
* Nanotube Technology Center, Fundamental Research
0008-6223 / 03 / $ – see front matter 2003 Published by Elsevier Science Ltd. doi:10.1016 / S0008-6223(03)00208-2
2458
Laboratories, NEC Laboratories: Tsukuba, Ibaraki 305 -8501, Japan
Tanso 207 – Abstracts 41 (2003) 2457 – 2458
34
Miyukigaoka,
** Nanotubulites Project, JST-ICORP: c /o NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305 -8501, Japan Single-wall carbon nanotubes (SWNTs) have unique structures with diameters of nanometer scale and length of micrometers or longer. Their properties are interesting; for example, high tensile strength and electrical properties of both semiconductors and metals depending on their structural symmetries. However, their production methods have not been well established. In this review, the methods of formation, purification, and purity estimation of SWNTs
are introduced. We also introduce single-wall carbon nanohorns (SWNH) that have SWNT-like structures and usually form spherical aggregates with diameters of 80| 100 nm. Two types of SWNH aggregates are known, dahlia and bud types. They are produced by CO 2 laser ablation at room temperature. Dahlia and bud types of SWNH aggregates are produced with purities of 90% and 70%, respectively. Among SWNH properties, gas adsorption phenomena are interesting. For example, specific surface area increases from about 300 m 2 / g to 1000 m 2 / g by treating in oxygen gas at 420 8C.
[TANSO 2003 (No.207) 87–93]