University of Cape Coast Institutional Repository

Browsing Department of Physics by Author "Twum, A."

Browsing Department of Physics by Author "Twum, A."

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  • Behaviour of hot electrons under the dc field in chiral carbon nanotubes 
    Amekpewu, M.; Dompreh, K. A.; Mensah, S. Y.; Mensah, N. G.; Abukari, S. S.; Musah, R.; Twum, A.; Edziah, R. (University of Cape Coast, 2016)
    Behaviour of hot electrons under the influence of dc field in carbon nanotubes is theoretically considered. The study was done semi-classically by solving Boltzmann transport equation with the presence of the hot electrons ...
  • Direct current generation due to wave mixing in zigzag carbon nanotubes 
    Abukari, S. S.; Mensah, S.Y.; Mensah, N. G.; Dompreh, K. A.; Twum, A.; Allotey, F. K. A. (University of Cape Coast, 2000)
    Generation of direct current in zigzag carbon nanotubes due to harmonic mixing of two coherent electromagnetic waves is being considered. The electromagnetic waves have commensurate frequencies of Ω and Ω. The rectification ...
  • Effect of laser on thermopower of chiral carbon nanotube 
    Mensah, S.Y.; Twum, A.; Mensah, N. G.; Dompreh, K. A.; Abukari, S. S.; Nkrumah-Buandoh, G (University of Cape Coast, 2000)
    An investigation of laser stimulated thermopower in chiral CNT is presented. The thermopower of a chiral CNT is calculated using a tractable analytical approach. This is done by solving the Boltzman kinetic equation with ...
  • Generation and amplification of terahertz radiation in carbon nanotubes 
    Abukaria, S. S.; Mensah, S.Y.; Mensah, N. G.; Adud, K. W.; Rabiu, M.; Dompreh, K. A.; Twum, A. (University of Cape Coast, 2012)
    We investigate theoretically the feasibility of generation and amplification of terahertz radiation in aligned achiral carbon nanotubes (zigzag and armchair) in comparison with a super lattice in the presence of a constant ...
  • Generation of terahertz radiation by wave mixing in armchair carbon nanotubes 
    Mensah, S.Y.; Abukari, S. S.; Mensah, N. G.; Dompreh, K. A.; Twum, A.; Allotey, F. K. A. (University of Cape Coast, 2000)
    Using semiclassical Boltzmann equation we have studied theoretically an effect of a direct current (DC) generation in undoped armchair carbon nanotube (CN) by mixing two coherent electromagnetic waves with commensurate ...
  • High frequency conductivity in carbon nanotubes 
    Abukari, S. S.; Mensah, S. Y.; Mensah, N. G.; Adu, K. A.; Rabiu, M.; Twum, A. (University of Cape Coast, 2012-12-05)
    We report on theoretical analysis of high frequency conductivity in carbon nanotubes. Using the kinetic equation with constant relaxation time, an analytical expression for the complex conductivity is obtained. The real ...
  • High frequency conductivity in carbon nanotubes 
    Abukari, S. S.; Mensah, S. Y.; Mensah, N. G.; Adu, K. A.; Rabiu, M.; Twum, A. (University of Cape Coast, 2012-12-05)
    We report on theoretical analysis of high frequency conductivity in carbon nanotubes. Using the kinetic equation with constant relaxation time, an analytical expression for the complex conductivity is obtained. The real ...
  • Laser stimulated thermal conductivity in chiral carbon nanotube 
    Twum, A.; Mensah, S. Y.; Mensah, N. G.; Dompreh, K. A.; Abukari, S.S.; Rabiu, M. (University of Cape Coast, 2012-08-04)
    An investigation of laser stimulated thermal conductivity in chiral CNT is presented. The thermal conductivity of a chiral CNT is calculated using a tractable analytical approach. This is done by solving the Boltzmann ...
  • Stability of gold thin films on polyimide 
    Amoako, G.; Mensah, S. Y.; Twum, A.; Teye, V. D. (University of Cape Coast, 2011)
    Gold/Polyimide interfaces are prepared by depositing thin gold films onto polyimide with Si substrates and subsequently annealing at various temperatures. The interface is studied with the help of Rutherford backscattering ...

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