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acoustoelectric Effect in Fluorinated Carbon Nanotube in the Absence of External Electric Field

World Journal of Condensed Matter Physics 2020年第1期10卷 1-11页

作者： D. Sakyi-Arthur S. Y. Mensah K. W. Adu K. A. Dompreh R. Edziah N. G. Mensah Department of Physics College of Agriculture and Natural Sciences U.C.C Cape Coast Ghana Department of Physics Pennsylvania State University-Altoona College Altoona PA USA Material Research Institute Pennsylvania State University University Park PA USA Department of Mathematics College of Agriculture and Natural Sciences U.C.C Cape Coast Ghana

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 hypersound regime i.e. , where q is the acoustic phonon wavenumber and is the electron mean free path. The results obtained are compared with that of undoped single walled carbon nanotube (SWCNT). The AE current density for FSWCNT is observed to be four orders of magnitude smaller than that of undoped SWCNT with increasing temperature, that is . This is because the electron-phonon interactions in SWCNT are stronger than FSWCNT. Thus, there are more intra-mini-band electrons interacting with the acoustic phonons to generate a higher AE current in SWCNT than in FSWCNT. This has been observed experimentally, where the electrical resistance of FSWCNT is higher than pristine SWCNT i.e. . The study shows the potential for FSWCNT as an ultrasound current source density imaging (UCSDI) and AE hydrophone material. However, FSWCNT offers the potential for room temperature applications of acoustoelectric device but other techniques are needed to reduce the resistance.

关键词： Carbon Nanotube Fluorinated acoustoelectric Hypersound

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Semiconductor Fluorinated Carbon Nanotube as a Low Voltage Current Amplifier Acoustic Device

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World Journal of Condensed Matter Physics 2020年第1期10卷 12-25页

作者： D. Sakyi-Arthur S. Y. Mensah K. W. Adu K. A. Dompreh R. Edziah N. Mensah C. Jebuni-Adanu Department of Physics College of Agriculture and Natural Sciences U.C.C Cape Coast Ghana Department of Mathematics College of Agriculture and Natural Sciences U.C.C Cape Coast Ghana Department of Physics Pennsylvania State University-Altoona College Altoona Pennsylvania USA Material Research Institute Pennsylvania State University University Park Pennsylvania USA St. Francis College of Education Hohoe Ghana

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 , where q is the acoustic wavenumber and is the electron mean-free path. In the presence of an external electric field, a strong nonlinear dependence of the normalized AE current density , on (?is the electron drift velocity and is the speed of sound in the medium) was observed and depends on the acoustic wave frequency, , wavenumber q, temperature T and the electron-phonon interactions parameter, . When , decreases to a resonance minimum and increases again, where the FSWCNT is said to be amplifying the current. Conversely, when , rises to a maximum and starts to decrease, similar to the observed behaviour in negative differential conductivity which is a consequence of Bragg’s reflection at the band edges at T=300K. However, FSWCNT will offer the potential for room temperature application as an acoustic switch or transistor and also as a material for ultrasound current source density imaging (UCSDI) and AE hydrophone devices in biomedical engineering. Moreover, our results prove the feasibility of implementing chip-scale non-reciprocal acoustic devices in an FSWCNT platform through acoustoelectric amplification.

关键词： Carbon Nanotube Fluorinated acoustoelectric Effect Low Voltage Acoustic Device

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Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube

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Graphene 2015年第3期4卷 62-74页

作者： K. A. Dompreh N. G. Mensah S. Y. Mensah S. S. Abukari F. Sam R. Edziah Department of Physics College of Agriculture and Natural Sciences U.C.C Cape Coast Ghana Department of Mathematics College of Agriculture and Natural Sciences U.C.C Cape Coast Ghana

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 ()?was done in the regime where (q is the acoustic phonon number and l is the electron mean free path). At T = 10K and θ > 0 (θ being scattering angle), the dependence of on acoustic wave number (q), frequency (ωq), and , (Vs and VD being the speed of sound and the drift velocity respectively) were analysed numerically at n = 0,±1,±2 (where n is an integer ) and presented graphically. It was observed that when γ VD = 1.1Vs which occurred at E = 51.7V·cm-1. In the second harmonics, (n = ±2), the absorption obtained was compared to experimental measurement of acoustoelectric current via the Weinreich relation and the results qualitatively agreed with each other.

关键词： Carbon Nanotube Hyperound Absorption acoustoelectric

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