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- E-ISSN 2288-8985
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The Analysis of Structure and Electron Energy State of Potassium-Graphite Fiber Intercalation Compounds
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1993, v.6 no.5, pp.479-487
Oh,
W., Kim,
M., &
Ko,
Y.
(1993). The Analysis of Structure and Electron Energy State of Potassium-Graphite Fiber Intercalation Compounds. Analytical Science and Technology, 6(5), 479-487.
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Abstract
Potassium-Graphite Fiber Intercalation Compounds(K-GFIC) have been prepared from well oriented pitch-based Graphite fiber by the transformed two-bulbs method with variation of reaction temperatures of graphite(<TEX>$T_g$</TEX> : <TEX>$450^{\circ}C$</TEX>, <TEX>$400^{\circ}C$</TEX>, <TEX>$350^{\circ}C$</TEX>, <TEX>$300^{\circ}C$</TEX>, <TEX>$250^{\circ}C$</TEX>). The stage transition process of K-GFICs was studied by X-ray diffraction methods, and we have observed peaks with d-values of (001) diffraction of <TEX>$5.40{\AA}$</TEX> and <TEX>$8.78({\pm}0.01){\AA}$</TEX>, which are charecteristic for the stage 1 and stage 2, respectively. The stage stability and energy states of K-GFICs were studied by UV/VIS spectrophotometer. As a results, We found that the minimum values of reflactance of K-GFICs with pure stage was moved to higher energy pristine Graphite fiber's. But because of mixtured stage, we could not observe minimum reflectance in the visible region at high reaction temperatures(<TEX>$400^{\circ}C$</TEX>, <TEX>$450^{\circ}C$</TEX>). From X-ray diffraction and UV/VIS sepctrophotometry data, we can suggest that K-GFICs with lower stage has many charge carriers existed between C atoms of graphite Layers. And then, these results also provides information on the electrical and other physical properties of K-GFICs.
- keywords
- Graphite fiber intercalation compounds, Potassium, Stage stability, Energy state, Two-bulbs mothod
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