Effects of the flow rate of hydrogen on the growth of graphene

Shi, Yonggui; Hao, Yue; Wang, Dong; Zhang, Jincheng; Zhang, Peng; Shi, Xuefang; Han, Dang; Chai, Zheng; Yan, Jian Hua

doi:10.1007/s12613-015-1049-3

Cited by 12 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to being affected by atmospheric exposure, the surface conductivity of H-terminated diamond films is also affected by the treatment conditions, as also observed in the case of graphene [9]. Generally, H atoms produced by microwave (MW) plasma or by thermal dissociation resulting from hot filament (HF) have been used to hydrogenate diamond surfaces.…”

Section: Introductionmentioning

confidence: 99%

Carrier transport characteristics of H-terminated diamond films prepared using molecular hydrogen and atomic hydrogen

Liu

Chen

Zheng

et al. 2017

Int J Miner Metall Mater

View full text Add to dashboard Cite

The H-terminated diamond films, which exhibit high surface conductivity, have been used in high-frequency and high-power electronic devices. In this paper, the surface conductive channel on specimens from the same diamond film was obtained by hydrogen plasma treatment and by heating under a hydrogen atmosphere, respectively, and the surface carrier transport characteristics of both samples were compared and evaluated. The results show that the carrier mobility and carrier density of the sample treated by hydrogen plasma are 15 cm 2 •V −1 •s −1 and greater than 5 × 10 12 cm −2 , respectively, and that the carrier mobilities measured at five different areas are similar. Compared to the hydrogen-plasma-treated specimen, the thermally hydrogenated specimen exhibits a lower surface conductivity, a carrier density one order of magnitude lower, and a carrier mobility that varies from 2 to 33 cm 2 •V −1 •s −1. The activated hydrogen atoms restructure the diamond surface, remove the scratches, and passivate the surface states via the etching effect during the hydrogen plasma treatment process, which maintains a higher carrier density and a more stable carrier mobility.

show abstract

Section: Introductionmentioning

confidence: 99%

Carrier transport characteristics of H-terminated diamond films prepared using molecular hydrogen and atomic hydrogen

Liu

Chen

Zheng

et al. 2017

Int J Miner Metall Mater

View full text Add to dashboard Cite

show abstract

“…Alternatively, as the number of carbon species on the surface of the base material increases, the edge diffusion rate of carbon atoms on the edge is restrained and does not fully reach the energy optimal position, thus producing the dendritic morphology. Therefore, we can conclude that high partial pressures of hydrogen are favorable for the formation of hexagonal graphene [11,[30][31][32][33].…”

Section: Symmetric and Asymmetric Graphene Morphologiesmentioning

confidence: 88%

Chemical vapor deposition growth behavior of graphene

Wang

Fan

et al. 2022

Int J Miner Metall Mater

View full text Add to dashboard Cite

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.

show abstract

“…37,97 This degree of shape control can be achieved through precise tuning of growth parameters. 64,[98][99][100][101] By adjusting the partial pressure of the precursor gases one can affect all the intermediate steps of the growth process, such as the decomposition of the hydrocarbon source as well as the deposition and diffusion of carbon atoms. Different morphologies of graphene flakes can be accurately tailored by tweaking the ratio of Ar : H 2 , which leads to precisely tuned graphene edges alternating between negative or positive curvature.…”

Section: Liquid Coppermentioning

confidence: 99%