Propagation effects and materials

Morgan, D.P.; Paige, E.G.S.

doi:10.1016/b978-012372537-0/50006-6

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…2(b). These dependencies are consistent with the description of the acoustoelectric effect provided by refs 3 and 4: in the absence of a magnetic field and in a closed circuit, the induced acoustoelectric current density j is given by:where μ is the charge carrier mobility, Q is the phonon pressure given by Q = I Γ/ v , I is the SAW intensity, and v is the velocity of the SAW (3979 m/s in 128° YX LiNbO 3 39 ). The attenuation per unit length Γ is given by a non-monotonic function of the diagonal component of the conductivity tensor σ 2D 2 :where K 2 is the piezoelectric coupling coefficient (0.056 in 128° YX LiNbO 3 ), λ is the SAW wavelength, and the attenuation is maximised at a characteristic conductivity σ M .…”

Section: Resultssupporting

confidence: 86%

Acoustoelectric Current in Graphene Nanoribbons

Poole

Nash

2017

Sci Rep

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Surface acoustic waves (SAWs) propagating on piezoelectric substrates offer a convenient, contactless approach to probing the electronic properties of low-dimensional charge carrier systems such as graphene nanoribbons (GNRs). SAWs can also be used to transport and manipulate charge for applications such as metrology and quantum information. In this work, we investigate the acoustoelectric effect in GNRs, and show that an acoustoelectric current can be generated in GNRs with physical widths as small as 200 nm at room temperature. The positive current in the direction of the SAWs, which corresponds to the transportation of holes, exhibits a linear dependence on SAW intensity and frequency. This is consistent with the description of the interaction between the charge carriers in the GNRs and the piezoelectric fields associated with the SAWs being described by a relatively simple classical relaxation model. Somewhat counter-intuitively, as the GNR width is decreased, the measured acoustoelectric current increases. This is thought to be caused by an increase of the carrier mobility due to increased doping arising from damage to the GNR edges.

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Section: Resultssupporting

confidence: 86%

Acoustoelectric Current in Graphene Nanoribbons

Poole

Nash

2017

Sci Rep

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“…The model was designed in the AutoCAD 2019 software with the subsequent import of the model into COMSOL Multiphysics 5.4 because of the limited capabilities of the CAD editor of the latter. The resonator consists of two ring-shaped inter-digital transducers (IDT) (1) and piezoelectric crystal located between the transducers (2). The entire structure is limited in both depth and radius by a damping medium to suppress the parasitic reflections of waves from the outer boundaries.…”

Section: Sensitive Element Designmentioning

confidence: 99%

“…Surface acoustic wave (SAW) based sensors, while less developed to date, provide a reasonable and largely promising alternative. Recent developments based on monolithic solid-state constructionsare characterized by relatively high stability of parameters, low energy consumption (0.5-1 W) [1]. Although SAW-based micromechanical accelerometers (MMA) are currently still under development, commercially available SAW sensors are widely used in other applications ranging from medicine and life safety to unmanned devices exemplified by vapor and gas analyzers [2][3][4], temperature control systems [5,6] as well as pressure detection systems [7].…”

Section: Introductionmentioning

confidence: 99%

Comparison of AlN vs. SIO2/LiNbO3 Membranes as Sensitive Elements for the SAW-Based Acceleration Measurement: Overcoming the Anisotropy Effects

Shevchenko

Mikhailenko

Markelov

2020

Sensors

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We propose the use of aluminum nitride (AlN) membranes acting as sensitive elements for the surface acoustic wave (SAW)-based acceleration measurement. The proposed solution is compared against existing prototypes based on the use of quartz (SiO2)/lithium niobate (LiNbO3) membranes that are characterized by extensive anisotropic properties. Using COMSOL Multiphysics 5.4 computer simulations we show explicitly that sensitive elements based on less anisotropic AlN membranes overcome both the low sensitivity limitations of SiO2 and low temperature stability of LiNbO3. Moreover, AlN membranes exhibit nearly double the robustness against irreversible mechanical deformations when compared against SiO2, which in turn allows for further 1.5-fold sensitivity enhancement over LiNbO3 based sensors. Taking into account their acceptable frequency characteristics, we thus believe that the AlN membranes are a good candidate forsensitive elements especially for high acceleration measurements.

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“…The device used for the mixing experiment consists of a SAW device equipped with a pair of interdigital electrodes (IDT) fabricated on the surface of a piezoelectric substrate and a Y-shaped microfluidic channel for transporting the nanoparticle solution and the dyes. A 128° rotated Y-cut X-propagation lithium niobate (LN, LiNbO 3 ) was used as the substrate due to its high electromechanical coupling coefficient ( k 2 = 5.6%) compared to other substrates used for SAW generation . A detailed process flow diagram is given in Figure S3.…”

Section: Experimental Sectionmentioning

confidence: 99%

Nanomechanical Microfluidic Mixing and Rapid Labeling of Silica Nanoparticles using Allenamide-Thiol Covalent Linkage for Bioimaging

Sreejith

Kishor

Abbas

et al. 2019

ACS Appl. Mater. Interfaces

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Rapid surface functionalization of nanomaterials using covalent linkage following "green chemistry" remains challenging, and the quest for developing simple protocols is persisting. We report a nanomechanical microfluidic approach for the coupling of allenamide functionalized organic derivatives on the surface of thiol-modified silica nanoparticles using allenamide-thiol chemistry. The coupling principle involves the use of a microfluidic surface acoustic wave device that generates acoustic streaming-based chaotic fluid micromixing that enables mixing of laterally flowing fluids containing active components. This approach was used to demonstrate the direct surface labeling of thiol-modified silica nanoparticles using a selected group of modified fluorescent tags containing allenamide handles and achieved a total labeling efficiency of 83−90%. This green approach enabled a highly efficient surface functionalization under aqueous conditions, with tunable control over the conjugation process via the applied field. The dye-labeled silica particles were characterized using various analytical techniques and found to be biocompatible with potential in live cell bioimaging. It is envisaged that this bioconjugation strategy will find numerous applications in the field of bioimaging and drug delivery.

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Propagation effects and materials

Cited by 12 publications

References 25 publications

Acoustoelectric Current in Graphene Nanoribbons

Acoustoelectric Current in Graphene Nanoribbons

Comparison of AlN vs. SIO2/LiNbO3 Membranes as Sensitive Elements for the SAW-Based Acceleration Measurement: Overcoming the Anisotropy Effects

Nanomechanical Microfluidic Mixing and Rapid Labeling of Silica Nanoparticles using Allenamide-Thiol Covalent Linkage for Bioimaging

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