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Author Cress, Cory D. ♦ Messenger, Scott R. ♦ Walters, Robert J. ♦ Schauerman, Christopher M. ♦ Raffaelle, Ryne P. ♦ Landi, Brian J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ MATERIALS SCIENCE ♦ NANOSCIENCE AND NANOTECHNOLOGY ♦ ALPHA PARTICLES ♦ CARBON ♦ CARBON IONS ♦ CARRIER DENSITY ♦ CHARGE CARRIERS ♦ ELECTRIC CONDUCTIVITY ♦ ENERGY LOSSES ♦ IRRADIATION ♦ MEV RANGE ♦ NANOTUBES ♦ PHYSICAL RADIATION EFFECTS ♦ SEMICONDUCTOR MATERIALS ♦ SUPERCONDUCTORS ♦ TEMPERATURE DEPENDENCE ♦ TEMPERATURE RANGE 0273-0400 K ♦ TUNNEL EFFECT ♦ WAVE FUNCTIONS ♦ CHARGED PARTICLES ♦ ELECTRICAL PROPERTIES ♦ ELEMENTS ♦ ENERGY RANGE ♦ FUNCTIONS ♦ IONIZING RADIATIONS ♦ IONS ♦ LOSSES ♦ MATERIALS ♦ NANOSTRUCTURES ♦ NONMETALS ♦ PHYSICAL PROPERTIES ♦ RADIATION EFFECTS ♦ RADIATIONS ♦ TEMPERATURE RANGE
Abstract The effects of ionizing radiation on the temperature-dependent conductivity of single-walled carbon nanotube (SWCNT) papers have been investigated in situ in a high vacuum environment. Irradiation of the SWCNT papers with 4.2 MeV alpha particles results in a steady decrease in the SWCNT paper conductivity, resulting in a 25% reduction in room temperature conductivity after a fluence of 3x10{sup 12} alpha particles/cm{sup 2}. The radiation-induced temperature-dependent conductivity modification indicates that radiation damage causes an increase in the effective activation barrier for tunneling-like conductivity and a concomitant increase in wavefunction localization of charge carriers within individual SWCNTs. The spatial defect generation within the SWCNT paper was modeled and confirms that a uniform displacement damage dose was imparted to the paper. This allows the damage coefficient (i.e., differential change in conductivity with fluence) for alpha particles, carbon ions, and protons to be compared with the corresponding nonionizing energy loss (NIEL) of the incident particle. The resulting nonlinear relationship with NIEL between these parameters is distinct from the more typical linear response observed in many bulk semiconductors and superconductors and indicates that localized radiation damage in the SWCNT papers has a greater impact than distributed damage. Although SWCNT papers behave largely as a bulk material with properties that are a convolution of the underlying SWCNT distribution, the radiation response appears to be largely dominated by degradation in the preferred one-dimensional conduction within these two-dimensionally confined nanostructures.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-01-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 107
Issue Number 1


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