Exfoliation of vapor-grown graphite fibers as studied by scanning electron microscope
1990; Elsevier BV; Volume: 28; Issue: 4 Linguagem: Inglês
10.1016/0008-6223(90)90050-9
ISSN1873-3891
AutoresAkira Yoshida, Yoshihiro Hishiyama, Michio Inagaki,
Tópico(s)Carbon Nanotubes in Composites
ResumoThe exfoliated vapor-grown graphite fibers were prepared from the intercalation compounds with potassium and tetrahydrofuran by rapid heating. The exfoliation process of the fibers was examined by a scanning electron microscope. The polygonal cross-section of the starting fibers changes and is rounded by the swelling due to intercalation, and also the fibers split into two parts along the fiber axis. In the fibers exfoliated at 250–360°C, minute pores between stacks of layers were developed, and grew in the radial direction of the fibers. The fibers heated up to 1000°C are completely exfoliated, and show a twisted ribbon-like appearance.
Referência(s)