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Browsing COLLEGE OF AGRICULTURAL & NATURAL SCIENCES by Author "Dompreh, K. A."

Browsing COLLEGE OF AGRICULTURAL & NATURAL SCIENCES by Author "Dompreh, K. A."

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  • Absorption of acoustic phonons in fluorinated carbon nanotubes with non-parabolic, double periodic band 
    Sekyi-Arthur, D.; Mensah, S. Y.; Mensah, N. G.; Dompreh, K. A.; Edziah, R. (University of Cape Coast, 2016)
    We studied theoretically the absorption of acoustic phonons in the hypersound regime in Fluorine modified Carbon Nanotube (F-CNT) ΓF –CNT and compared it to that of undoped Single Walled Nanotube (SWNT) ΓSW NT .Per the ...
  • Acoustoelectric effect in degenerate carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y.; Sam, F.; Twum, A.K. T (University of Cape Coast, 2015)
    Acoustoelectric Effect AE in degenerate Carbon Nanotube (CNT) was theoretically studied for hypersound in the regime ql >> 1. The dependence of acoustoelectric current jac on the acoustic wave number ~ and frequency ωq at ...
  • Acoustoelectric effect in fluorinated carbon nanotube in the absence of external electric field 
    Sakyi-Arthur, D.; Mensah, S. Y.; Adu, K. W.; Dompreh, K. A.; Edziah, R.; Mensah, N. G (University of Cape Coast, 2020-01-23)
    Acoustoelectric effect (AE) in a non-degenerate Fluorine modified single walled carbon nanotube (FSWCNT) semiconductor is studied theoretically using the Boltzmann’s transport equation. The study is done in the hyper sound ...
  • Acoustoelectric effect in Graphene with degenerate energy dispersion 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y. (University of Cape Coast, 2015)
    The acoustoelectric effect AE in Graphene with degenerate energy dispersion is theoretically studied for hypersound in the regime ql >> 1. At low temperatures (kβT << 1), the non-linear dependence of Acoustoelectric current ...
  • Amplification of acoustic waves in armchair graphene nanoribbon in the presence of external electric and magnetic field 
    Dompreh, K. A.; Mensah, S. Y.; Abukari, S. S.; Sam, F.; Mensah, N. G. (University of Cape Coast, 2015)
    Amplification of Acoustic Waves in Armchair Graphene Nanoribbon (AGNR) in the presence of an external Electric and Magnetic field was studied using the Boltzmann’s kinetic equation. The general expression for the Amplification ...
  • Amplification of hypersound in graphene with degenerate energy dispersion 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y. (University of Cape Coast, 2015)
    Hypersound amplification/absorption of acoustic phonons in Graphene with degenerate energy dispersion ε(p) near the Fermi level was theoretically studied. For kβT << 1 and ql >> 1, the dependence of the absorption coefficient ...
  • 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 of hot electrons in carbon nanotubes 
    Amekpewua, M.; Mensah, S. Y.; Musah, R.; Mensah, N. G.; Abukari, S. S.; Dompreh, K. A. (University of Cape Coast, 2015)
    High frequency conductivity of hot electrons in undoped single walled achiral carbon nanotubes (CNTs) under the influence of ac-dc driven fields is considered. We investigated semi classically by solving the Boltzmann’s ...
  • Hot electrons injection in carbon nanotubes under the influence of quasi-static ac-field 
    Amekpewu, M.; Mensah, S. Y.; Musaha, R.; Mensah, N. G.; Abukari, S. S.; Dompreh, K. A. (University of Cape Coast, 2015)
    Hot electrons injection in carbon nanotubes (CNTs ) where in addition to applied dc field (E), there exist simultaneously a quasi-static ac electric field (i.e. when the frequency ω of ac field is much less than the ...
  • Hypersound absorption of acoustic phonons in a degenerate carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y.; Abukari, S. S.; Sam, F.; Edziah, R. (University of Cape Coast, 2015)
    Absorption of acoustic phonons was studied in degenerate Carbon Nanotube (i.e. where the electrons are found close to the Fermi level). The calculation of the hypersound absorption coefficient (Γ) was done in the regime ...
  • 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 ...
  • Negative differential conductivity in carbon nanotubes in the presence of an external electric field 
    Abukari, S. S.; Mensah, S.Y.; Mensah, N. G.; Adu, K.W.; Dompreh, K. A.; Twum, A. K. (University of Cape Coast, 2000)
    We study theoretically the electron transport properties in carbon nanotubes under the influence of an external electric field () using Boltzmann’s equation. The current-density equation is derived. Negative differential ...
  • Nonlinear conductivity in graphene 
    Abukaria, S. S.; Mensah, S. Y.; Musah, R.; Mensah, N. G.; Dompreh, K. A. (University of Cape Coast, 2015)
    We consider the tight-binding approximation for the description of energy bands of graphene, together with the standard Boltzmanns transport equation and constant relaxation time, an expression for the conductivity was ...
  • On the amplification of acoustic phonons in carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Sakyi-Arthur, D.; Mensah, S. Y. (University of Cape Coast, 2016)
    We present a theoretical study of acoustic phonons amplification in Carbon Nanotubes (CNT). The phenomenon is via Cerenkov emission (CE) of acoustic phonons using intraband transitions proposed by Mensah et. al., [1] in ...
  • Semiconductor fluorinated carbon nanotube as a low voltage current amplifier acoustic device 
    Sakyi-Arthur, D.; Mensah, S. Y.; Adu, K. W.; Dompreh, K. A.; Edziah, R.; Mensah, N.; Jebuni-Adanu, C. (University of Cape Coast, 2020-02-12)
    Acoustoelectric effect (AE) in a non-degenerate fluorinated single walled carbon nanotube (FSWCNT) semiconductor was carried out using a tractable analytical approach in the hypersound regime q 1 , where q is the acoustic ...
  • Stark-cyclotron resonance in an array of carbon nanotubes 
    Abukaria, S. S.; Mensah, S. Y.; Musah, R.; Mensah, N. G.; Dompreh, K. A. (University of Cape Coast, 2015)
    Using the kinetic approach based on the semiclassical Boltzmanns transport equation with constant relaxation time, we theoretically studied the Stark cyclotron resonance in an array of carbon nanotubes. Exact expression ...

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