Control of NEMS Based on Carbon Nanotube

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Here we consider the controlled operation of a gigahertz oscillator based on a carbon nanotube. A new method for controlling the motion of nanoelectromechanical systems (NEMS) is proposed. This method is based on the appearance of an electric dipole moment of a carbon nanotube in case of chemical adsorption of atoms at its ends and the further control of this dipole by non-uniform electric field. Investigations of the possibility of stationary oscillations and influence of system characteristics and control parameters on the oscillator operation are performed via molecular dynamics simulations. The minimum amplitude of the control force which is necessary to sustain the oscillations of constant amplitude is shown to depend on the Q-factor of the system. Thus, the Q-factor of the oscillator is obtained from molecular dynamics simulations of free oscillations of the system. The influence of thermodynamic fluctuations on the operation of NEMS is considered on example of a gigahertz oscillator. Significant Q-factor fluctuations are revealed for this system. These Q-factor fluctuations have the critical effect on the possibility of controlling the oscillator operation. The control of oscillator motion in the case of considerable fluctuations can be performed if the amplitude of the control force is increased.

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Journal: TechConnect Briefs
Volume: 3, Nanotechnology 2008: Microsystems, Photonics, Sensors, Fluidics, Modeling, and Simulation – Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 3
Published: June 1, 2008
Pages: 725 - 728
Industry sector: Advanced Materials & Manufacturing
Topic: Informatics, Modeling & Simulation
ISBN: 978-1-4200-8505-1