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  • 2000-2004  (2)
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  • 2000-2004  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Optical and electrical properties of opal carbon replica and effect of pyrolysis (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 758-763 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical reflection, electrical conductivity, and magnetoconductance of porous opal carbon replicas which have a periodic nanoscale structure have been studied. The temperature dependence of resistivity in green opal carbon replica is different from that in red opal carbon replica. The electrical properties of replica heat treated up to 3000 °C are consistent with those of pyrolitic graphite. The periodicity is found to decrease with this heat treatment by scanning electron microscopy and reflection measurements. Due to alkali metal doping, optical reflection spectra of replica with a heat treatment temperature of 2800 °C have changed drastically. The occurrence of positive magnetoconductance indicates the existence of quantum effect at low temperature. These results indicate that the electrical and optical properties can be controlled by pyrolysis technique and porous graphite can be obtained. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373734
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical and electrochemical properties of fly ash and effect of pyrolysis (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7316-7319 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical and electrochemical characteristics of pyrolized fly ash which has a porous structure have been investigated for use as an electrode active material in rechargeable batteries. The electrodes of pyrolized fly ash show good stability and high Coulombic efficiency in charge–discharge cycles in LiClO4/PC. The charge–discharge capacity of pyrolized fly ash with a heat treatment temperature of 1100 °C is as high as 205 mA h/g. From the viewpoint of recycling of industrial waste, we propose to use fly ash as a negative electrode in a lithium ion secondary battery. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372986
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    Paper (German National Licenses)
    Fulltext
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