Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.18: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Comparative studies of the electrical behavior of catalytically grown scrolled graphene and multi-walled carbon nanotubes — •Andreas Schaper1, Mingsheng Wang2, Houqing Hou3, Yoshio Bando2, and Dmitri Golberg22 — 1Center for Materials Science, Philipps University, 35032 Marburg, Germany — 2National Institute for Materials Science, Tsukuba, Ibaraki 3050044, Japan — 3Chemistry College of Jiangxi University, Nanchang, JX 330027, P.R. China
Besides the well known single-walled and nested-tube multi-walled carbon nanotubes (SWCNTs, MWCNTs), and the successful isolated flat graphene, scrolled graphene (carbon nanoscrolls, CNSs) has been receiving increasing interest in recent time. Here, we report in situ electron microscope measurements of the electrical behavior of CNSs and CNTs prepared using catalyst-assisted chemical vapour deposition. In the low-bias region, strictly linear IV characteristics were observed with resistance values in the range 0.8 - 15.0 kΩ for CNSs and 20 - 30 kΩ for MWCNTs. With increasing applied voltage, a superlinear behavior was detected with maximum current-carrying capacities of 8.5 x 108 A/cm2 (CNSs) and 107 A/cm2 (MWCNTs). As revealed by the IV data and by time-resolved image sequences, the electric breakdown of the scrolls always occurred in an abrupt manner, while the nanotubes showed a sequential destruction of the concentric-shell geometry. Due to their superb properties, CNSs are promising as electronic device elements with no limitations as to electric contacting.