Rotation-excited perfect oscillation of a tri-walled nanotube-based oscillator at ultralow temperature

Cai, K, Zhang, X, Shi, J and Qin, Q 2017, 'Rotation-excited perfect oscillation of a tri-walled nanotube-based oscillator at ultralow temperature', Nanotechnology, vol. 28, no. 15, pp. 1-1.

Document type: Journal Article
Collection: Journal Articles

Title Rotation-excited perfect oscillation of a tri-walled nanotube-based oscillator at ultralow temperature
Author(s) Cai, K
Zhang, X
Shi, J
Qin, Q
Year 2017
Journal name Nanotechnology
Volume number 28
Issue number 15
Start page 1
End page 1
Total pages 1
Publisher Institute of Physics
Abstract In recent years, carbon-nanotube (CNT)-based gigahertz oscillators have been widely used in numerous areas of practical engineering such as high-speed digital, analog circuits, and memory cells. One of the major challenges to practical applications of the gigahertz oscillator is generating a stable oscillation process from the gigahertz oscillators and then maintaining the stable process for a specified period of time. To address this challenge, an oscillator from a triple-walled CNT-based rotary system is proposed and analyzed numerically in this paper, using a molecular dynamics approach. In this system, the outer tube is fixed partly as a stator. The middle tube, with a constant rotation, is named Rotor 2 and runs in the stator. The inner tube acts as Rotor 1, which can rotate freely in Rotor 2. Due to the friction between the two rotors when they have relative motion, the rotational frequency of Rotor 1 increases continuously and tends to converge with that of Rotor 2. During rotation, the oscillation of Rotor 1 may be excited owing to both a strong end barrier at Rotor 2 and thermal vibration of atoms in the tubes. From the discussion on the effects of length of Rotor 1, temperature, and input rotational frequency of Rotor 2 on the dynamic response of Rotor 1, an effective way to control the oscillation of Rotor 1 is found. Being much longer than Rotor 2, Rotor 1 will have perfect oscillation, i.e., with both stable (or nearly constant) period and amplitude - especially at relatively low temperature. This discovery can be taken as a useful guidance for the design of an oscillator from CNTs.
Subject Nanoelectromechanical Systems
Keyword(s) carbon nanotube
molecular dynamics
DOI - identifier 10.1088/1361-6528/aa622d
Copyright notice © 2017 IOP Publishing Ltd.
ISSN 0957-4484
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