• English
  • Deutsch
  • Log In
    Password Login
    Research Outputs
    Fundings & Projects
    Researchers
    Institutes
    Statistics
Repository logo
Fraunhofer-Gesellschaft
  1. Home
  2. Fraunhofer-Gesellschaft
  3. Artikel
  4. DFT investigations of the piezoresistive effect of carbon nanotubes for sensor application
 
  • Details
  • Full
Options
2012
Journal Article
Title

DFT investigations of the piezoresistive effect of carbon nanotubes for sensor application

Abstract
We investigate the piezoresistive effect of carbon nanotubes (CNTs) within density functional theory (DFT) aiming at application-relevant CNTs. CNTs are excellent candidates for the usage in nano-electromechanical sensors (NEMSs) due to their small band gap at zero strain leading to a finite resistivity at room temperature. The application of strain induces a band gap-opening leading to a tremendous change in the resistivity. DFT with the LDA approximation yields reasonable results for pure carbon systems like CNTs and is applied to calculate the electronic structure of experimentally relevant CNTs. For the transport part, a simple ballistic transport model based on the band gap is used. We compare our DFT results for the band gaps of strained CNTs to results of tight binding (TB) models. By introducing a scaling factor of $sqrt {2} $, an excellent agreement of the DFT data with TB model, published by Yang and Han [Phys. Rev. Lett. 85, 154 (2000)], is obtained.
Author(s)
Wagner, Christian Friedemann  orcid-logo
Schuster, Jörg  
Geßner, Thomas  
Journal
Physica status solidi. B  
DOI
10.1002/pssb.201200113
Language
English
Fraunhofer-Institut für Elektronische Nanosysteme ENAS  
  • Cookie settings
  • Imprint
  • Privacy policy
  • Api
  • Contact
© 2024