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Synthesis of flake-like graphene from nickel-coated polyacrylonitrile polymer.

Kwon HJ, Ha JM, Yoo SH, Ali G, Cho SO - Nanoscale Res Lett (2014)

Bottom Line: We observed that spatially non-uniform and disconnected graphene was fabricated when PAN film coated with a Ni layer was pyrolyzed, resulting in flake-like graphene.Dewetting phenomenon can be reduced by decreasing the pyrolysis temperature, and hence, more uniform graphene could be prepared.The effects of Ni coating thickness and the pyrolysis temperature on the fabricated graphene have been experimentally analyzed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea ; Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, 29 Geumgu-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea.

ABSTRACT
Graphene can be synthesized from polyacrylonitrile (PAN) polymer through pyrolysis. A metal catalyst such as nickel (Ni) is required for the conversion of the polymer to graphene. The metal catalysts can be placed either atop or underneath the polymer precursor. We observed that spatially non-uniform and disconnected graphene was fabricated when PAN film coated with a Ni layer was pyrolyzed, resulting in flake-like graphene. Formation of the flake-like graphene is attributed to the dewetting of the Ni layer coated on the PAN film. Dewetting phenomenon can be reduced by decreasing the pyrolysis temperature, and hence, more uniform graphene could be prepared. The effects of Ni coating thickness and the pyrolysis temperature on the fabricated graphene have been experimentally analyzed.

No MeSH data available.


FE-SEM images of the Ni-coated PAN films after the pyrolysis at 950°C/10 min. Where the coated Ni thickness is 40 nm (a), 100 nm (b), and 200 nm (c), respectively.
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Figure 3: FE-SEM images of the Ni-coated PAN films after the pyrolysis at 950°C/10 min. Where the coated Ni thickness is 40 nm (a), 100 nm (b), and 200 nm (c), respectively.

Mentions: The evolution of the surface morphology at different Ni thickness was investigated. As can be seen in Figure 3, an agglomerate of micrometer- or nanometer-sized Ni particles were observed after the pyrolysis at 950°C. Formation of the Ni particles from the Ni film is attributed to dewetting phenomenon [25]. The size of the produced Ni particles increased with increasing the thickness of the Ni coating (Figure 3a,b,c).


Synthesis of flake-like graphene from nickel-coated polyacrylonitrile polymer.

Kwon HJ, Ha JM, Yoo SH, Ali G, Cho SO - Nanoscale Res Lett (2014)

FE-SEM images of the Ni-coated PAN films after the pyrolysis at 950°C/10 min. Where the coated Ni thickness is 40 nm (a), 100 nm (b), and 200 nm (c), respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4256972&req=5

Figure 3: FE-SEM images of the Ni-coated PAN films after the pyrolysis at 950°C/10 min. Where the coated Ni thickness is 40 nm (a), 100 nm (b), and 200 nm (c), respectively.
Mentions: The evolution of the surface morphology at different Ni thickness was investigated. As can be seen in Figure 3, an agglomerate of micrometer- or nanometer-sized Ni particles were observed after the pyrolysis at 950°C. Formation of the Ni particles from the Ni film is attributed to dewetting phenomenon [25]. The size of the produced Ni particles increased with increasing the thickness of the Ni coating (Figure 3a,b,c).

Bottom Line: We observed that spatially non-uniform and disconnected graphene was fabricated when PAN film coated with a Ni layer was pyrolyzed, resulting in flake-like graphene.Dewetting phenomenon can be reduced by decreasing the pyrolysis temperature, and hence, more uniform graphene could be prepared.The effects of Ni coating thickness and the pyrolysis temperature on the fabricated graphene have been experimentally analyzed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea ; Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, 29 Geumgu-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea.

ABSTRACT
Graphene can be synthesized from polyacrylonitrile (PAN) polymer through pyrolysis. A metal catalyst such as nickel (Ni) is required for the conversion of the polymer to graphene. The metal catalysts can be placed either atop or underneath the polymer precursor. We observed that spatially non-uniform and disconnected graphene was fabricated when PAN film coated with a Ni layer was pyrolyzed, resulting in flake-like graphene. Formation of the flake-like graphene is attributed to the dewetting of the Ni layer coated on the PAN film. Dewetting phenomenon can be reduced by decreasing the pyrolysis temperature, and hence, more uniform graphene could be prepared. The effects of Ni coating thickness and the pyrolysis temperature on the fabricated graphene have been experimentally analyzed.

No MeSH data available.