Chien-Chung Han, Jyh-Tsung Lee, Reen-Woei Yang, Hua Chang and Chein-Hwa Han
Highly crystalline and single-walled micrometer-sized carbon tubes several centimeters in length have been prepared via the pyrolysis of composite fibers consisting of a thermally stable polypyrrole skin layer and a thermally degradable PET core fiber.