Tunable synthesis and in situ growth of silicon-carbon mesostructures using impermeable plasma

Yaghoubi, Alireza; Mélinon, P.

doi:10.1038/srep01083

Cited by 7 publications

(8 citation statements)

References 25 publications

(23 reference statements)

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“…Until today, graphitic SiC has proven to be an elusive material, lingering at the boundary of mirage and reality. We have previously introduced a new method for synthesis of endothermic compounds using impermeable plasma, a type of thermal plasma that is insulated by a blanket of high-pressure gas (Δ P plasma‑gas = –7500 Torr). The plasma–gas interface acts as a diamagnetic barrier that repels the escaping ions back into the core, where they collide with other ions and induce viscous heating.…”

Section: Resultsmentioning

confidence: 99%

Is Graphitic Silicon Carbide (Silagraphene) Stable?

et al. 2018

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Graphene is considered to be the most likely candidate for the postsilicon era; however, the problem with its zero band gap is challenging to overcome. A close relative of silicon, silicon carbide is expected to have a stable 2D polymorph which happens to be a wide-gap semiconductor. Unfortunately, the so-called silagraphene has proven to be elusive. To date, neither theoretical nor experimental studies have been conclusive. Here, we employ computational methods to determine the stable arrangements of silagraphene and establish their accurate band structure. We also experimentally validate our models by preparing and characterizing a number of graphitic features. Silagraphene exhibits a wide spectrum of optoelectronic properties (360–690 nm) as well as an unusual band structure with highly anisotropic transport properties, which originates from its nondispersive band near its K-point. This feature makes direct-indirect gap crossover extremely sensitive to ambient conditions, making silagraphene suitable for a range of sensors.

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Section: Resultsmentioning

confidence: 99%

Is Graphitic Silicon Carbide (Silagraphene) Stable?

et al. 2018

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“…Recently, SiC NWs, as one of the most promising nanoscale building blocks, have attracted increasing interest due to their superior mechanical properties 1 , high temperature oxidation resistance 2 , excellent chemical stability 3 , low thermal expansion coefficients 4 , high thermal conductivity 5 , and large band gap 5 , which enables their applications in composite reinforcements 6 , 7 , nanodevices and optoelectronics 1 , 3 . For example, Yang et al .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ultralong SiC nanowires with unique optical properties, excellent thermal stability and flexible nanomechanical properties

Dong

Zhang

et al. 2017

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Several-millimeter long SiC nanowires (NWs) with unique optical properties, excellent thermal stability and flexible nanomechanical properties were synthesized using a simple method with silicon and phenolic resin as the raw materials. The SiC NWs displayed special optical properties that were attributed to their large size and Al-doping. They displayed broad green emission at 527.8 nm (2.35 eV) and purple emission concentrated at 438.9 nm (2.83 eV), in contrast to the other results, and the synthesized SiC NWs could also remain relatively stable in air up to 1000 °C indicating excellent thermal stability. The Young’s moduli of the SiC NWs with a wide range of NW diameters (215–400 nm) were measured using an in situ nanoindentation method with a hybrid scanning electron microscopy/scanning probe microscopy (SEM/SPM) system for the first time. The results suggested that the values of the Young’s modulus of the SiC NWs showed no clear size dependence, and the corresponding Young’s moduli of the SiC NWs with diameters of 215 nm, 320 nm, and 400 nm were approximately 559.1 GPa, 540.0 GPa and 576.5 GPa, respectively. These findings provide value and guidance for studying and understanding the properties of SiC nanomaterials and for expanding their possible applications.

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“…So the whole device can be made tunable which adds more functionality to the device. We believe this work will be very useful for future investigations on intriguing properties and applications of GhHC; such as imaging 8 , near field radiative heat transfer 30 31 , asymmetric transmission device 32 , especially the ones based on negative refraction with superior transmission which may find practical applications, such as hyper-lensing 33 and imaging in that particular frequency range of interest.…”

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confidence: 98%

Negative Refraction with Superior Transmission in Graphene-Hexagonal Boron Nitride (hBN) Multilayer Hyper Crystal

Sayem

Rahman

Mahdy

et al. 2016

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In this article, we have theoretically investigated the performance of graphene-hexagonal Boron Nitride (hBN) multilayer structure (hyper crystal) to demonstrate all angle negative refraction along with superior transmission. hBN, one of the latest natural hyperbolic materials, can be a very strong contender to form a hyper crystal with graphene due to its excellence as a graphene-compatible substrate. Although bare hBN can exhibit negative refraction, the transmission is generally low due to its high reflectivity. Whereas due to graphene’s 2D nature and metallic characteristics in the frequency range where hBN behaves as a type-I hyperbolic material, we have found graphene-hBN hyper-crystals to exhibit all angle negative refraction with superior transmission. Interestingly, superior transmission from the whole structure can be fully controlled by the tunability of graphene without hampering the negative refraction originated mainly from hBN. We have also presented an effective medium description of the hyper crystal in the low-k limit and validated the proposed theory analytically and with full wave simulations. Along with the current extensive research on hybridization of graphene plasmon polaritons with (hyperbolic) hBN phonon polaritons, this work might have some substantial impact on this field of research and can be very useful in applications such as hyper-lensing.

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Tunable synthesis and in situ growth of silicon-carbon mesostructures using impermeable plasma

Cited by 7 publications

References 25 publications

Is Graphitic Silicon Carbide (Silagraphene) Stable?

Is Graphitic Silicon Carbide (Silagraphene) Stable?

Synthesis and characterization of ultralong SiC nanowires with unique optical properties, excellent thermal stability and flexible nanomechanical properties

Negative Refraction with Superior Transmission in Graphene-Hexagonal Boron Nitride (hBN) Multilayer Hyper Crystal

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