|Budget Amount *help
¥2,100,000 (Direct Cost : ¥2,100,000)
Fiscal Year 1997 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1996 : ¥1,300,000 (Direct Cost : ¥1,300,000)
In this study, ternary graphite intercalation compounds of alkali metal-unsaturated organic molecules-graphite have been synthesized, and their structure and electrical conductivity, together with their stability in the air, have been investigated. The results obtained are as follows.
1. Rubidium-and potassium-graphite intercalation compounds (Rb-GICs and K-GICs) of the stage-2 structure were used as host materials, in addition to cesium-graphite intercalation compounds (Cs-GICs), and were allowed to react with ethylene gas to form the ternary compounds. The ternary K-GICs showed different sorption behavior from that of the ternary Cs-GICs, and the layr structure of the ternary K-GICs is also apparently different. It has been revealed that the ternary Cs-GICs have the most stable structure in the air and their electrical conductivity has been kept at high level for a considerably long time.
2. Cs-GICs were allowed to react with several unsaturated organic molecules such as acrylonitrile, benzene etc., and the structure and electrical conductivity of resulting ternary GICs were investigated. Gas phase acrylonitrile was sorbed into CsC_<24> very slowly at 300 K,and the saturated composition was CsC_<24> (AN) _<1.4>. The ternary GIC was stable in vacuum, but decomposed slowly in the air. In order to improve the stability of the ternary in the air, the sample was heat-treated at 323 K for 150 hrs to enhance the oligomerization of acrylonitrile molecules. The results shows, however, very little effects in the stability of the ternary GIC.
In conclusion, the ternary system, cesium-ethylene-graphite GICs are considered to be most promising as the high-electrical conductive and stable materials.