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Growth kinetics of white graphene (h-BN) on a planarised Ni foil surface.

Cho H, Park S, Won DI, Kang SO, Pyo SS, Kim DI, Kim SM, Kim HC, Kim MJ - Sci Rep (2015)

Bottom Line: The morphology of the surface and the grain orientation of metal catalysts have been considered to be two important factors for the growth of white graphene (h-BN) by chemical vapour deposition (CVD).Atmospheric annealing with hydrogen reduced the nucleation sites of h-BN, which induced a large crystal size mainly grown from the grain boundary with few other nucleation sites in the Ni foil.A higher growth rate was observed from the Ni grains that had the {110} or {100} orientation due to their higher surface energy.

View Article: PubMed Central - PubMed

Affiliation: 1] Soft Innovative Materials Research Center, Korea Institute of Science and Technology, Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabuk-do 565-905, Republic of Korea [2] Department of Organic Materials and Fiber Engineering, Chonbuk National University, 567, Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.

ABSTRACT
The morphology of the surface and the grain orientation of metal catalysts have been considered to be two important factors for the growth of white graphene (h-BN) by chemical vapour deposition (CVD). We report a correlation between the growth rate of h-BN and the orientation of the nickel grains. The surface of the nickel (Ni) foil was first polished by electrochemical polishing (ECP) and subsequently annealed in hydrogen at atmospheric pressure to suppress the effect of the surface morphology. Atmospheric annealing with hydrogen reduced the nucleation sites of h-BN, which induced a large crystal size mainly grown from the grain boundary with few other nucleation sites in the Ni foil. A higher growth rate was observed from the Ni grains that had the {110} or {100} orientation due to their higher surface energy.

No MeSH data available.


SEM images and EBSD analysis data of the Ni foil with ECP/LPH2-10 min:(a) SEM image, (b) EBSD orientation map, (c) SEM image of area A, and (d) SEM image of area B.
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f5: SEM images and EBSD analysis data of the Ni foil with ECP/LPH2-10 min:(a) SEM image, (b) EBSD orientation map, (c) SEM image of area A, and (d) SEM image of area B.

Mentions: In order to gain an insight into the growth kinetics of h-BN in relation to the crystalline orientations, we performed Electron Back Scatter Diffraction (EBSD) analysis on the Ni foil where h-BN was grown after ECP/LPH2-10 min or ECP/APH2-10 min. The effect of ECP/LPH2-10 min is presented in the SEM image with the grain orientations (Fig. 5). They showed numerous triangular domains with small grain size, and the number of nucleations was similar in all crystalline orientations of the Ni foil. Only the triangular shape of h-BN was clearly shown on the Ni grains where the crystalline orientation was {100} or {110}, as shown in Fig. 5(c,d). We can assume that these triangular domains are nitrogen terminated, as boron-terminated domains have higher edge energy than nitrogen-terminated ones. Boron can easily react with a hydrogen atom on the surface of the {100} or {111} crystalline orientation to produce BHx gas173145.


Growth kinetics of white graphene (h-BN) on a planarised Ni foil surface.

Cho H, Park S, Won DI, Kang SO, Pyo SS, Kim DI, Kim SM, Kim HC, Kim MJ - Sci Rep (2015)

SEM images and EBSD analysis data of the Ni foil with ECP/LPH2-10 min:(a) SEM image, (b) EBSD orientation map, (c) SEM image of area A, and (d) SEM image of area B.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496663&req=5

f5: SEM images and EBSD analysis data of the Ni foil with ECP/LPH2-10 min:(a) SEM image, (b) EBSD orientation map, (c) SEM image of area A, and (d) SEM image of area B.
Mentions: In order to gain an insight into the growth kinetics of h-BN in relation to the crystalline orientations, we performed Electron Back Scatter Diffraction (EBSD) analysis on the Ni foil where h-BN was grown after ECP/LPH2-10 min or ECP/APH2-10 min. The effect of ECP/LPH2-10 min is presented in the SEM image with the grain orientations (Fig. 5). They showed numerous triangular domains with small grain size, and the number of nucleations was similar in all crystalline orientations of the Ni foil. Only the triangular shape of h-BN was clearly shown on the Ni grains where the crystalline orientation was {100} or {110}, as shown in Fig. 5(c,d). We can assume that these triangular domains are nitrogen terminated, as boron-terminated domains have higher edge energy than nitrogen-terminated ones. Boron can easily react with a hydrogen atom on the surface of the {100} or {111} crystalline orientation to produce BHx gas173145.

Bottom Line: The morphology of the surface and the grain orientation of metal catalysts have been considered to be two important factors for the growth of white graphene (h-BN) by chemical vapour deposition (CVD).Atmospheric annealing with hydrogen reduced the nucleation sites of h-BN, which induced a large crystal size mainly grown from the grain boundary with few other nucleation sites in the Ni foil.A higher growth rate was observed from the Ni grains that had the {110} or {100} orientation due to their higher surface energy.

View Article: PubMed Central - PubMed

Affiliation: 1] Soft Innovative Materials Research Center, Korea Institute of Science and Technology, Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeollabuk-do 565-905, Republic of Korea [2] Department of Organic Materials and Fiber Engineering, Chonbuk National University, 567, Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.

ABSTRACT
The morphology of the surface and the grain orientation of metal catalysts have been considered to be two important factors for the growth of white graphene (h-BN) by chemical vapour deposition (CVD). We report a correlation between the growth rate of h-BN and the orientation of the nickel grains. The surface of the nickel (Ni) foil was first polished by electrochemical polishing (ECP) and subsequently annealed in hydrogen at atmospheric pressure to suppress the effect of the surface morphology. Atmospheric annealing with hydrogen reduced the nucleation sites of h-BN, which induced a large crystal size mainly grown from the grain boundary with few other nucleation sites in the Ni foil. A higher growth rate was observed from the Ni grains that had the {110} or {100} orientation due to their higher surface energy.

No MeSH data available.