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Chemical Modification of Carbon Materials and Transport Properties of the Resulting Compounds

碳材料的化学改性和所得化合物的传输性能

基本信息

批准号：
08650792
负责人：
AKUZAWA Noboru
金额：
$ 1.09万
依托单位：
Tokyo National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Carbon 1s spectra were determined as a function of the composition, K/C,for potassium intercalated graphite. The C1s spectra shifted towards higher energy and broadened with the increase of K/C.The shift was explained on the basis of the fact that the Fermi level shift increases with the increase of K/C as a result of the charge transger from potassium to carbon pi bands.Alkali metal-graphite intercalation compounds such as CsC_<24> can accomodate various molecules in its interlayr nano-spaces. It is very interesting to know the interaction between alkali metal ions and the penetrating molecules. It was found that the electrical conductivity of CsC_<24> changed remarkably and the effect of sorption temperature on the electical conductivity change was large for the system CsC_<24>-C_2H_2. On the other hand, the change of the electrical conductivity of CsC_<24> was less than 10%, and the temperature effect was small in the case of CsC_<24>-C_2H_4. Those results were discussed from the viewpoint that Cs ions can interact with pi electrons of C_2H_2, but not for C_2H_4.Effect of the degree of graphitization on the electrical conductivity, magnetoresistance and Hall coefficient of potassium intercalated carbon materials was also determined. Large values of the electrical conductivity and the magnetoresistance were observed for well graphitized material. For poorly graphitized materials, the temperature dependence of the electrical conductivity did not change to metallic one even if the intercalation of potassium took place.

碳1 s光谱被确定为钾插层石墨的组成，K/C的函数。随着K/C的增加，C1 s谱向高能方向移动，谱线变宽，这是由于K/C的增加使费米能级移动增加，这是由于K的π带电荷向碳的π带电荷转移的结果.碱金属-石墨层间化合物如CsC_2可以<24>在其层间纳米空间中容纳各种分子.碱金属离子与渗透分子之间的相互作用是一个非常有趣的问题。结果表明，CsC_2-C_2H_2体系的电导率<24>发生了显著变化，且吸附温度对电导率变化的影响较大<24>。CsC_2-C_2H_4体系电导率的变化<24>小于10%，且温度效应较小<24>。从Cs离子能与C_2H_2的π电子相互作用而不能与C_2H_4的π电子相互作用的观点对上述结果进行了讨论。大的值的电导率和磁阻观察良好的石墨化材料。对于石墨化较差的材料，即使发生钾的嵌入，电导率的温度依赖性也不会改变为金属电导率。