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Laser-assisted exfoliation of potassium-ammonia-graphite intercalation compounds

✍ Scribed by Yoshikazu Kuga; Toshiyuki Oyama; Takiko Wakabayashi; Hironobu Chiyoda; Kazuo Takeuchi

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
568 KB
Volume
31
Category
Article
ISSN
0008-6223

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✦ Synopsis

Potassium-ammonia-graphite intercalation compounds (K-NH3-GIC) synthesized from small natural graphite particles from China were rapidly heated by a cw-Nd:YAG laser beam (I ,056 pm) in an Ar purge environment to yield exfoliated small graphite particles as sources for electrical conductive films. The laser heating method was demonstrated to be effective for exfoliation of K-NH,-GIC prepared from natural graphites in sizes of under 37 pm, 37 -63 Frn, and 63 -88 pm, whereas no exfoliation of these graphites occurred by either gas burner heating or electric furnace heating. The results also show that K-NH3-GIC prepared from natural graphite 350 -500 pm in size was exfoliated to 32-fold ofthe volume of feed natural graphite. This exfoliation ratio is 2.6 times larger than the ratio obtained by the gas burner heating method.

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