Circular Graphene Platelets with Grain Size and Orientation Gradients Grown by Chemical Vapor Deposition

Xin, Xing; Fei, Zeyuan; Ma, Teng; Chen, Long; Chen, Maolin; Xu, Chuan; Qian, Xitang; Sun, Dongming; Ma, Xiang; Cheng, Hui‐Ming; Ren, Wencai

doi:10.1002/adma.201605451

Cited by 10 publications

(7 citation statements)

References 45 publications

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“…The fundamental of this method is such that the gas source (and in some cases the carrying gas as well) is entered into the chamber with a high level of purity. An agent is used to decompose the initial material which, depending on the method, can be the heat given by the heater, plasma, or laser etc …”

Section: Introductionmentioning

confidence: 99%

“…An agent is used to decompose the initial material which, depending on the method, can be the heat given by the heater, plasma, or laser etc. [5][6][7] Tungsten was first produced at the end of 18 century, but it was unused till the beginning of 19 century. Ever since tungsten was found, a wide variety of applications in engineering products were found.…”

Section: Introductionmentioning

confidence: 99%

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The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

Sabzi

Anijdan

Asadian

2018

Int J Applied Ceramic Tech

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Effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating produced by hot filament chemical vapor deposition (HFCVD) process was studied. Annealed sheets of 316L stainless steels were used as the substrate. HFCVD technique, with substrate temperatures of 400 and 500°C, was used to deposit tungsten carbide coating on these sheets. Field Emission Scanning Electron Microscope (FE‐SEM) was used to study the evolution of microstructure. X‐Ray Diffraction spectroscopy was used to analyze the phases formed and Raman spectroscopy was employed to differentiate molecular composition of the coatings. The amount of the porosity of the coatings was measured and Vickers hardness measurement was used for hardness assessment. Results show that the tungsten carbide coatings have a honeycomb structure and increasing the temperature of the substrate increases the amount of porosity of the coating. XRD results showed that 3 different crystalline structures containing W, WC, and W2C were formed in the coating deposited on the 316L stainless steel. Increasing the temperature of the deposition has increased the intensity of the peaks in the XRD results. Raman spectroscopy results indicated the presence of a carbon in the tungsten carbide coatings. Finally, microhardness of the tungsten carbide coating increases with increasing the temperature of the substrate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

Sabzi

Anijdan

Asadian

2018

Int J Applied Ceramic Tech

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“…Previous studies reported that graphene exhibits a variety of shapes, including triangle [14], rectangle [15][16][17][18], hexagon [19][20], U shape [21], circular [22], and dendrites [11,[23][24]. Although graphene with different morphologies could be customized by adjusting the ratio of the hydrogen and argon carrier gas mixture [23,25], the influence of the ratio of methane to hydrogen (CH 4 /H 2 ) on the formation of graphene with different morphologies was not reported systematically.…”

Section: Introductionmentioning

confidence: 99%

Chemical vapor deposition growth behavior of graphene

Wang

Fan

et al. 2022

Int J Miner Metall Mater

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The optimized growth parameters of graphene with different morphologies, such as dendrites, rectangle, and hexagon, have been obtained by low-pressure chemical vapor deposition on polycrystalline copper substrates. The evolution of fractal graphene, which grew on the polycrystalline copper substrate, has also been observed. When the equilibrium growth state of graphene is disrupted, its intrinsic hexagonal symmetry structure will change into a non-hexagonal symmetry structure. Then, we present a systematic and comprehensive study of the evolution of graphene with different morphologies grown on solid copper as a function of the volume ratio of methane to hydrogen in a controllable manner. Moreover, the phenomena of stitching snow-like graphene together and stacking graphene with different angles was also observed.

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“…The continuous change characteristics of chemical composition and phase arrangement from one side to the other result in multi-level, non-uniformity and multi-scale microstructure. So far, plasma spraying (Wang et al , 2017), chemical vapor deposition (Xin et al , 2017) and powder metallurgy (Zhang et al , 2011) are common methods to prepare bimetallic structures. For manufacturing components of complex structure, the disadvantages of low efficiency and high cost bring about huge challenge.…”

Section: Introductionmentioning

confidence: 99%

Forming feasibility and interface microstructure of Al/Cu bimetallic structure fabricated by laser powder bed fusion

Guan

Wang

Chen

et al. 2021

RPJ

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Purpose The purpose of this paper is to analyze and investigate heat accumulation caused by temperature changes and interface microstructure effected by element diffusion. Design/methodology/approach Al/Cu bimetallic structure is initially manufactured through laser powder bed fusion process. To minimize trial and error, finite element modeling is adopted to simulate temperature changes on the Al-based and Cu-based substrate. Findings The results show that forming pure copper on Al-based substrate can guarantee heat accumulation, providing enough energy for subsequent building. The instantaneous laser energy promotes increase of diffusion activation energy, resulting in the formation of transition zone derived from interdiffusion between Al and Cu atoms. The interface with a thickness of about 22 µm dominated by Kirkendall effect moves towards Al-rich side. The interface microstructure is mainly composed of a-Al, a-Cu and CuAl2 phase. Originality/value The bonding mechanism of Al/Cu interface is atom diffusion-induced chemical reaction. The theoretical basis provides guidance for structural design and production application.

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Circular Graphene Platelets with Grain Size and Orientation Gradients Grown by Chemical Vapor Deposition

Cited by 10 publications

References 45 publications

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

Chemical vapor deposition growth behavior of graphene

Forming feasibility and interface microstructure of Al/Cu bimetallic structure fabricated by laser powder bed fusion

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