title: Electrical properties in magnetic field of macroscopic carbon nanotube objects.
abstract: The electrical properties including zero-field resistivity, magnetoresistance and current-voltage (I-V) curves of macroscopic carbon nanotube (CNT) objects (yarns, bundles, films, and networks) have been measured. The macroscopic CNT objects exhibit semiconductor-like behaviors. Under the magnetic field applied perpendicular to the plane or axis of the Macroscopic CNT objects, a pronounced negative magnetoresistance have been observed. Due to the aligned, close-packed structure of MWNT yarn, its MR reach as high as -17% at 9 T. The I-V curves of the MWNT network exhibit a linear relationship even at low temperature, but the other samples exhibit a nonlinear relationship, indicating the effect of morphology and defects of CNTs in macroscopic CNT objects.
authors.affiliation: Department of Physics, Institute of Low-Dimesional Carbons and Device Physics, Shanghai University, Shanghai 200444, P. R. China.
authors.forename: L
authors.initials: L
authors.lastname: Sheng
authors.forename: W
authors.initials: W
authors.lastname: Gao
authors.forename: X
authors.initials: X
authors.lastname: Ma
authors.forename: X
authors.initials: X
authors.lastname: Zhao
authors.forename: S
authors.initials: S
authors.lastname: Cao
authors.forename: J
authors.initials: J
authors.lastname: Zhang