| Project/Area Number |
03650632
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | Musashi Institute of Technology |
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Principal Investigator |
HISHIYAMA Yoshihiro Musashi Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (90061499)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | glass-like carbon / glass-like carbon film / cellulose film / polyimide film / magnetoresistance / Hall coefficient / electrical resistivity / X-ray parameters / ボリイミドフィルム / 電気抵抗率 / ホ-ル係数 / SEM |
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| Research Abstract |
Dense glass-like carbon films of about 20 mum thickness were prepared from a commercially available cellulose film of 40 mum thickness by heat treatment in nitrogen atmosphere up to 900ﾟC with a heating rate lower than 200ﾟC/h. Carbon films thus obtained were heat-treated at temperatures between 1800 and 3000ﾟC for 30 min. The heat-treated carbon films were investigated by the measurements of resistivity at room and liquid nitrogen temperatures, and Hall coefficient and magnetoresistance at liquid nitrogen temperature. The cross section of each heat-treated films were observed using a field-emission-gun type high resolution scanning electron micro-scope (HSEM). The measurements and observations for high-temperature-treated specimens indicated that the present glass-like carbon film was more graphitizable than bulk glass-like carbons. It was found that each of high-temperature-treated specimens consisted substantially of the matrix of granular microtexture and the graphite layer skins of 100 to 300 nm thickness.
Another glass-like carbon film was made from a commercially available polyimide, LARC-TPI of 50 mum thickness, with the same condition as that prepared from the cellulose film. The measurements of the magnetoresistance and HSEM observations it was indicated that the microtexture of the high-temperature-treated specimens were exactly the same as that of the specimens obtained from the cellulose film.
In order to confirm the crystal structure of the layer skins to be graphitic, the 900ﾟC-carbonized cellulose films were heat-treated at temperatures between 2600 and 3000ﾟC for 1 hr and reflected and transmitted X-ray diffraction experiments on these heat-treated films were carried out. It was found that the crystal structure of the skins was really graphitic and was improved with increasing HTT, the skins being graphitizable.
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