A review of microwave devices based on CVD-grown graphene with experimental demonstration

Lu, Wei‐Bing; Chen, Hui; Liu, Zhenguo

doi:10.1051/epjam/2019001

Cited by 3 publications

(3 citation statements)

References 34 publications

(41 reference statements)

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“…It should be noted that graphene material is mainly synthesized through four methods, including 1) mechanical exfoliation of highly ordered pyrolytic graphite (HOPG), 2) the epitaxial growth of graphene on silicon carbide (SiC), 3) the reduction of graphene oxide, and 4) chemical vapor deposition (CVD) technique. The comparison of these methods in terms of quality and the fabricated area is provided in Table 1 [36].…”

Section: Surface Conductivity Of Graphene Materials Under Different Conditionsmentioning

confidence: 99%

Dyadic Green’s Function for Multilayered Planar, Cylindrical, and Spherical Structures with Impedance Boundary Condition

Raad¹,

Atlasbaf²

2022

Electromagnetic Wave Propagation for Industry and Biomedical Applications

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The integral equation (IE) method is one of the efficient approaches for solving electromagnetic problems, where dyadic Green’s function (DGF) plays an important role as the Kernel of the integrals. In general, a layered medium with planar, cylindrical, or spherical geometry can be used to model different biomedical media such as human skin, body, or head. Therefore, in this chapter, different approaches for the derivation of Green’s function for these structures will be introduced. Due to the recent great interest in two-dimensional (2D) materials, the chapter will also discuss the generalization of the technique to the same structures with interfaces made of isotropic and anisotropic surface impedances. To this end, general formulas for the dyadic Green’s function of the aforementioned structures are extracted based on the scattering superposition method by considering field and source points in the arbitrary locations. Apparently, by setting the surface conductivity of the interfaces equal to zero, the formulations will turn into the associated problem with dielectric boundaries. This section will also aid in the design of various biomedical devices such as sensors, cloaks, and spectrometers, with improved functionality. Finally, the Purcell factor of a dipole emitter in the presence of the layered structures will be discussed as another biomedical application of the formulation.

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Section: Surface Conductivity Of Graphene Materials Under Different Conditionsmentioning

confidence: 99%

Dyadic Green’s Function for Multilayered Planar, Cylindrical, and Spherical Structures with Impedance Boundary Condition

Raad¹,

Atlasbaf²

2022

Electromagnetic Wave Propagation for Industry and Biomedical Applications

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show abstract

“…Besides the fact that graphene act as moderate conductor at microwave frequencies, the tunability property of graphene utilizing changing external bias helps in improving the conductivity of graphene [11][12]. Exclusive properties of graphene make it attractive for biomedical applications nds widespread use in drug delivery and photothermal therapy [13].…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of Different Configurations of Graphene-Based Superficial Microwave Hyperthermia

Singla¹,

Marwaha²,

Marwaha³

et al. 2021

Preprint

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For treating superficial tumours patch antennas present a more compact structure and are easy to design. Graphene-based antenna applicators can further provide an effective solution for the non-invasive procedure by selecting different configurations of the patch for producing homogeneous energy deposition. Graphene patch facilitates the reduction of surface waves among the healthy tissues. Four different antenna shapes of graphene-based antenna applicators are designed at operating frequency of 915 MHz in ISM band and comparison is performed in terms of SAR and temperature distribution. Among all the applicators triangular patch applicator outperforms in terms of more localized heating and attains the highest value of temperature at 324°K and SAR of 186 W/Kg at insertion depth of 6 mm. The double slot applicator also provides localized SAR and uniform heating but results in the lower temperature of 315°K and much reduced SAR of 41 W/Kg at same insertion depth. Further, the effect of distance between the source and tissue model has also been investigated. It has been found that SAR decreases with increased distance from the radiating source. At the optimized distance of 3 mm, SAR values obtained for rectangular, circular, triangular and double slot patch applicator are 60 W/Kg, 54.7 W/Kg, 134.1 W/Kg and 54.2 W/Kg respectively.

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“…Exfoliated graphene nanosheet (GN) materials were extensively investigated in terms of their synthesis and potential applications. − They exhibit extremely low electron–phonon scattering rates with charge carrier mobilities higher than 200 000 cm 2 /(V s) at room temperature . Structurally, these nanocarbon ensembles bear a close resemblance to fullerenes as e – -acceptors in the presence of organic e – -donors .…”

Section: Introductionmentioning

confidence: 99%

Reversible Enlargement of Photoswitchable Dielectric Properties by Plasmonic [60]Fullerenyl Core–Shell Nanoparticles on Graphene Nanosheets

Wang

Yin

et al. 2020

J. Phys. Chem. C

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Utilization of [60]fullerosome monolayer grafting approach on both sides of graphene nanosheets giving the corresponding sandwiched nanostructures was demonstrated as a key intermediate for the construction of photoswitchable and tunable dielectric graphene nanosheet materials. They were covered by magnetic plasmonic core–shell nanoparticles of γ-FeO x @AuNP and light-harvesting C60(>DPAF-C9) monoadduct conjugates as the shell layer via a subsequent deposition procedure. Resulting multilayered core–shell nanosheet materials were found to be capable of inducing reversible dielectric property amplification effects in a photoswitching manner in the radio frequency (RF) range of 1.0–18 GHz. They were also found to be RF-wave-absorbing materials that led to the observation of minimum reflection coefficient values (low −dB). We substantiated these photophysical properties by relative dielectric (εr′) measurements and related applications using a combination of bistatic angle (θ)-, frequency-, and irradiation-time-dependent measurements. Specifically, we investigated the photoinduced changes of relative dielectric characteristics as a result of accumulated surface plasmon resonance (SPR) energy at the core–shell interlayers in a nanoscale toward potential morphological modulation of RF signals by photoswitching tunability of reflectivity.

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A review of microwave devices based on CVD-grown graphene with experimental demonstration

Cited by 3 publications

References 34 publications

Dyadic Green’s Function for Multilayered Planar, Cylindrical, and Spherical Structures with Impedance Boundary Condition

Dyadic Green’s Function for Multilayered Planar, Cylindrical, and Spherical Structures with Impedance Boundary Condition

Comparative Investigation of Different Configurations of Graphene-Based Superficial Microwave Hyperthermia

Reversible Enlargement of Photoswitchable Dielectric Properties by Plasmonic [60]Fullerenyl Core–Shell Nanoparticles on Graphene Nanosheets

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