Theoretical analysis on the electronic properties of bubble-wrap carbon nanostructure: fullerene-doped graphene

In this research, two graphene-based THz patch antenna structures for satellite communication and 5G applications is reported. In the unit cell analysis, it can be pointed out that the patch is made of graphene and the substrate is made of silicon dioxide. While its dielectric permittivity is 3.7. The operating frequency of the MIMO antenna is designed at 0.6 THz. In the plan of MIMO reconfigurable antenna, cells are arranged vertically. Reconfigurable conditions can be achieved by changing the chemical potential or in other words the bias voltage of graphene patches. The amount of chemical potential in the original project of both quad-port MIMO reconfigurable antennas is considered to be 0.6 eV. In the results of the first antenna, S11 is less than -10 dB in the range of 0.58786 THz through 0.63112 THz. In the results of the second antenna, S11 is less than -10 dB in the range of 0.57814 THz through 0.63391 THz. In the results of the first antenna, maximum efficiency is reported about 65%. In the results of the second antenna, maximum efficiency is reported about 72%. Finally, peak realized gains, radiation efficiencies, far-field 2D radiation patterns, VSWRs, current distributions, envelope correlation coefficients (port1-port2, port1-port3, port1-port4), and diversity gains (port1-port2, port1-port3, port1-port4) have all been reported over the operating frequency band for two antennas.

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“…And this is how it is described, 𝜏 −1 = 2Γ. Fermi-Dirac function is defined as follows [53][54][55][56][57]:…”

Section: Graphene Conductivitymentioning

confidence: 99%

Graphene-based quad-port MIMO reconfigurable antennas for SATCOM and 5G applications

Kiani

Hamedani

Rezaei

2023

Preprint

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“…Nanostructure has very a good application prospect in microelectronic devices and have received wide attention from field scholars around the globe in recent years [1][2][3][4][5][6][7][8][9][10]. With the development of modern electronic equipment, the design of such equipment develops toward the directions of highly integrated and multifunctional, and the heat dissipation problem during operation rises consequently [11][12][13][14]. If the heat of the electronic equipment cannot dissipate in a timely manner, it'll affect the performance of the equipment and even cause thermal damage to it [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Nanostructure in Microelectronic Equipment and the Enhancement of Its Thermo-Physical Properties

Li¹,

Jing²,

Liu³

et al. 2022

IJHT

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To optimize the heat dissipation performance of microelectronic equipment, optical instrument, and optoelectronic devices, it’s necessary to explore the heat transfer mechanism of the nanostructure in them, however, due to the limitation of the research objects, there isn’t a uniform simulation method for the thermo-physical properties of such nanostructure. Therefore, this paper aims to study the thermo-physical properties of nanostructure in microelectronic equipment. At first, by structuring Si super lattice nanowires in a specific direction and then using the Ge atoms to replace the Si atoms in the nanowires, this paper built a model for the periodic Si/Ge super lattice nanowires. Then, this paper performed integral operation on the dynamic equations of the two types of atoms using the time integration algorithm to attain the trajectories of Si and Ge atoms in the nanowire structure of the microelectronic equipment, and discussed the influence of the size and geometrical shape of the cross section of nanowires on thermal conductivity. After that, this paper simulated the structure of the nano-scale SiC material, selected appropriate cut-off radius, and optimized the structure of the nanostructure model based on the Discover Minimization module. At last, the thermal conductivity of the nanostructure was calculated and its thermo-physical properties were analyzed.

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“…Por su parte, la modelación computacional ha presentado avances en la caracterización de estos materiales híbridos, como por ejemplo el análisis de interacciones débiles entre una hoja de grafeno y furellenos [46] o el estudio de nuevas estructuras híbridas de furellenos con hojas de grafeno, donde los furellenos se pueden encontrar sobre o inmersos en la hoja de grafeno, mostrando potencial uso en aplicaciones nanoelectrónicas [35]. Respecto a estas nanoestructuras hibridas, graf eno − C 60 , se han realizado estudios DFT de su estructura atómica y electrónica, donde se consideran fullerenos completos y fragmentos de fullerenos C 60 .en interacción con una sola capa de grafeno.…”

Section: Estado Del Arte Y Antecedentesunclassified

Estudio de las propiedades de adsorción de un sistema formado por Grafeno + Semifullereno (C₃₀) decorado con diferentes metales

Canales¹

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Utilizando la teoría del funcional de la densidad (DFT) y el formalismo del pseudopotencial, se realizaron cálculos computacionales ab initio para estudiar un sistema formado por un semifullereno (C₃₀) y una hoja de grafeno (5,5) con vacancias, así como también, predecir las propiedades catalíticas en la adsorción de moléculas contaminantes: O, CO₂, CH₄ y O₃ cuando el sistema es decorado con diferentes metales (Li, Ti y Pt). Se consideraron dos configuraciones para el sistema, el semifullereno interactuando con el grafeno con una base hexagonal y la otra con base pentagonal. Encontramos que en las dos configuraciones propuestas el semifullereno se adsorbe a la hoja de grafeno con vacancias. Además, en ambas configuraciones: grafeno+C₃₀penta y grafeno+C₃₀hexa, el semifullereno se pudo decorar con un átomo de los metales de Li, Ti y Pt. Así, obtuvimos diferentes superficies, las cuales están formadas por una hoja de grafeno y semifullereno decorado con un metal (grafeno+C₃₀M), el metal funciona como catalizador en la adsorción de las diferentes moléculas contaminantes. Encontramos que la adsorción de las moléculas depende de la forma de la base del semifullereno y del metal. Tenemos que el CO se adsorbe cuando la superficie con base pentagonal esta dopada con Ti y cuando la superficie base hexagonal esta dopada con Pt. En ambos casos el CO se adsorbe sin disociación. El CO₂ se adsorbe en ambas superficies cuando están dopadas con Li, la adsorción también ocurre sin disociación de la molécula. El O₃ se adsorbe en todas las configuraciones de la superficie. Se observa que cuando la superficie está dopada con Pt ó Ti, el O₃ se disocia en un átomo de O y una molécula de O₂. El CH₄ no se adsorbe en ningún caso.

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Theoretical analysis on the electronic properties of bubble-wrap carbon nanostructure: fullerene-doped graphene

Cited by 5 publications

References 20 publications

Graphene-based quad-port MIMO reconfigurable antennas for SATCOM and 5G applications

Graphene-based quad-port MIMO reconfigurable antennas for SATCOM and 5G applications

Thermal Conductivity of Nanostructure in Microelectronic Equipment and the Enhancement of Its Thermo-Physical Properties

Estudio de las propiedades de adsorción de un sistema formado por Grafeno + Semifullereno (C₃₀) decorado con diferentes metales

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