Generation and Propagation of Ultrasonic Waves in  Piezoelectric Graphene Nanoribbon

Musah, Rabiu; Mensah, S. Y.; Abukari, S. S.; Amekpewu, Matthew; Sefa-Ntiri, Baah; Twum, Anthony

doi:10.4236/oja.2013.33a007

Cited by 7 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The acoustic behavior of G/PVA MBs does not change with respect to the plain PVA MBs (see Figure S10 in the Supporting Information), indicating that the anchored graphene does not affect the intrinsic echogenic properties of microbubbles shell. To date, few studies have investigated the acoustic properties of graphene, where it was reported a strong emission of ultrasonic waves in the range of THz frequencies . However, Chivikula et al have demonstrated that surface acoustic waves in graphene may occur at lower frequencies (MHz) in response to optical irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…To date, few studies have investigated the acoustic properties of graphene, where it was reported a strong emission of ultrasonic waves in the range of THz frequencies. 57 However, Chivikula et al have demonstrated that surface acoustic waves in graphene may occur at lower frequencies (MHz) in response to optical irradiation. This effect results from the conversion of the optical energy, absorbed by the graphene flake, to the heating of the sample.…”

Section: Field Emission Scanning Electron Microscopy (Fesem)mentioning

confidence: 99%

See 1 more Smart Citation

Graphene Meets Microbubbles: A Superior Contrast Agent for Photoacoustic Imaging

Toumia

Domenici

Orlanducci

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Coupling graphene with a soft polymer surface offers the possibility to build hybrid constructs with new electrical, optical, and mechanical properties. However, the low reactivity of graphene is a hurdle in the synthesis of such systems which is often bypassed by oxidizing its carbon planar structure. However, the defects introduced with this process jeopardize the properties of graphene. In this paper we present a different approach, applicable to many different polymer surfaces, which uses surfactant assisted ultrasonication to exfoliate, and simultaneously suspend, graphene in water in its intact form. Tethering pristine graphene sheets to the surfaces is accomplished by using suitable reactive functional groups of the surfactant scaffold. We focused on applying this approach to the fabrication of a hybrid system, made of pristine graphene tethered to poly(vinyl alcohol) based microbubbles (PVA MBs), designed for enhancing photoacoustic signals. Photoacoustic imaging (PAI) is a powerful preclinical diagnostic tool which provides real time images at a resolution of 40 μm. The leap toward clinical imaging has so far been hindered by the limited tissues penetration of near-infrared (NIR) pulsed laser radiation. Many academic and industrial research laboratories have met this challenge by designing devices, each with pros and cons, to enhance the photoacoustic (PA) signal. The major advantages of the hybrid graphene/PVA MBs construct, however, are (i) the preservation of graphene properties, (ii) biocompatibility, a consequence of the robust anchoring of pristine graphene to the bioinert surface of the PVA bubble, and (iii) a very good enhancement in a NIR spectral region of the PA signal, which does not overlap with the signals of PA active endogenous molecules such as hemoglobin.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Field Emission Scanning Electron Microscopy (Fesem)mentioning

confidence: 99%

Graphene Meets Microbubbles: A Superior Contrast Agent for Photoacoustic Imaging

Toumia

Domenici

Orlanducci

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Among piezoelectric materials, polyvinylidene fluoride (PVDF) is a well-known piezoelectric polymer [3]. This piezoelectric polymer can generate ultrasonic flexural waves because of its flexibility and piezoelectric properties [4].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic wave propagation of flexible piezoelectric polymer for tactile actuator: simulation and experiment

Akther

Kafy

Zhai

et al. 2016

Smart Mater. Struct.

View full text Add to dashboard Cite

This study deals with ultrasonic wave propagation on a piezoelectric polymer substrate for tactile actuator. On the piezoelectric polymer substrate, a pair of interdigital transductor (IDT) electrodes is patterned by lift-off process and a resonator is made by exciting the IDTs. A standing wave is generated between the pair of IDT electrodes, of which the wavelength matches with the distance between two IDTs. The standing ultrasonic waves can give different textures to the users. The wave propagation in this periodic structure on the polymer substrate is studied by harmonic and transient analysis. Vertical displacement and induced voltage at the output IDT electrode are calculated and the ultrasonic wave generation is experimentally verified. The proposed concept of tactile actuator based on ultrasonic wave is explained.

show abstract

“…Azizyan [43] calculated the absorption coefficient in a quantized electric field. Furthermore, Acoustic wave absorption/amplification in Graphenes [44,45,46], Cylindrical quantum wires [47] , and quantum dots [48,49] have all received attention. On the concept of Acoustoelectric effect (AE) in bulk [50] and low-dimensional materials [51], much research has been comprehensively done both theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube

Dompreh

Mensah²,

Mensah³

et al. 2015

Graphene

View full text Add to dashboard Cite

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 Superlattices (SSL) and confirmed in [2]. From this, an asymmetric graph of Γ CN T on V d Vs and Ωτ were obtained where amplification (Γ CN T amp ) >> absorption (Γ CN T abs ). The ratio, |Γ CN T amp | |Γ CN T abs | ≈ 3.5, at V d = 1.02V s , ω q = 3.0 THz and T = 85 K for scattering angle θ > 0 . A threshold field at which Γ CN T abs switches over to Γ CN Tamp was calculated to be E dc z = 6.2 × 10 3 V/m. This field is far less than that deduced using Bloch-Type Oscillation (BTO) [3] which is E dc BT O = 3.0 × 10 5 V/m. The obtained Γ CN T amp would enable the use of CNT for the production of SASER.

show abstract

Generation and Propagation of Ultrasonic Waves in Piezoelectric Graphene Nanoribbon

Cited by 7 publications

References 10 publications

Graphene Meets Microbubbles: A Superior Contrast Agent for Photoacoustic Imaging

Graphene Meets Microbubbles: A Superior Contrast Agent for Photoacoustic Imaging

Ultrasonic wave propagation of flexible piezoelectric polymer for tactile actuator: simulation and experiment

Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube

Contact Info

Product

Resources

About