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Using ab initio many-body perturbation theory (within GW approximation and Bethe-Salpeter equation), including electronic exchange, correlation, and electron-hole interaction effects, we study the optical properties of large-diameter semiconducting single-walled carbon nanotubes (SWCNTs). The calculated energies of the lowest two optically allowed transitions (E11 and E22) agree well with those deduced...
Magnetic carbon nanotube composites were prepared by decorating magnetic Fe 3 O 4 nanoparticles on the external surface of polydopamine (PDA)-encapsulated carbon nanotubes (CNTs/PDA) in an in situ coprecipitation method. The process involved the encapsulation of CNTs with PDA, the deposition of Fe 2 O 3 on the CNTs/PDA surface, and the deposition of Fe 3 O ...
This paper presents synthesis and characterization of conducting polypyrrole-multi-walled carbon nanotube films co-depositing onto nickel electrode substrate. The electrochemical polymerization of pyrrole is performed in 100ml aqueous solution containing 0.2M pyrrole, 0.05M AOT and 0.01g multiwalled carbon nanotubes using three-electrode system. The SEM and cyclic voltammetry analysis show that the...
In this work, bamboo-shaped CNTs were successfully fabricated by PECVD using ZnO:Co thin film as catalyst. ZnO:Co nanoclusters were produced by a nanocluster-beam deposition system. Briefly, a metal target consisting of 98% Zn and 2% Co was used with a sputtering power of 130 W. Ar, He and Oxygen gases were injected into the system with the corresponding total pressure of 0.75 Torr. A plasma enhanced...
We show that optic ally-gated carbon nanotube field effect transistors can be used as 2-terminal like devices with light sensitivity and memory capabilities. In particular, their channel resistivity can be adjusted precisely, within a large range and memorized. These devices can thus be used as synapses in neural network type of circuits. We demonstrate experimentally these properties, build a device...
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