منابع مشابه
Doping of carbon nanotubes using low energy ion implantation.
Carbon nanotubes (CNTs) were implanted with thermally decomposed oxygen (O2+) and nitrogen (N2+) ions at an acceleration voltage of 20 V. With a low dose of oxygen ions, the CNT-FET exhibited p-type behaviors with substantial changes in threshold voltage and in the slope of the source-drain current (l(sd)). However, at high dosages, the device exhibited metallic behaviors. After nitrogen doping...
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sReceived 16 September 2004; accepted 2 December 2004; published online 25 January 2005d We report on a method to locally remove material from carbon and boron nitride nanotubes using the low-energy focused electron beam of a scanning electron microscope. Using this method, clean precise cuts can be made into nanotubes, either part-way through screating hingelike geometriesd or fully through sc...
متن کاملSize, Shape, and Low Energy Electronic Structure of Carbon Nanotubes
A theory of the long-wavelength low-energy electronic structure of graphite-derived nanotubules is presented. The propagating p electrons are described by wrapping a massless two dimensional Dirac Hamiltonian onto a curved surface. The effects of the tubule size, shape, and symmetry are included through an effective vector potential which we derive for this model. The rich gap structure for all...
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Single-wall carbon nanotubes (SWCNTs) are one of the most promising materials for future nano-electronics, because of their unique quasi-one-dimensional structures and excellent electric and mechanical properties. They also have very high chemical stability, owing to their robust sp2-bonding carbon network (graphene) with no dangling bonds. Because of the structural robustness, low-energy (typi...
متن کاملLow – Energy Properties of ( 0 , 2 ) Compactifications ∗
We investigate the low–energy properties of a ZZ12 orbifold with continuous Wilson line moduli. They give rise to a (0,2) superstring compactification. Their Kähler potentials and Yukawa couplings are calculated. We study the discrete symmetries of the model and their implications on the threshold corrections to the gauge couplings as well as for string unification. String theory is the only kn...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1997
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.78.4245