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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.


Schematic diagram to fabricate a multilayer graphene film from polyacrylonitrile.
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Figure 1: Schematic diagram to fabricate a multilayer graphene film from polyacrylonitrile.

Mentions: After the pyrolysis, the coated Ni layer was removed with a Ni etchant (Nickel Etchant Type TFB purchased from TRANSENE, Danvers, MA, USA) at approximately 35°C for 2 to 4 h.The synthesized graphene on the substrate was characterized by Raman spectroscopy (532 nm laser, Ramboss500I, DongWoo Optron, Republic of Korea) and Raman mapping (514.5 nm laser, ARAMIS, Horiba Jobin Yvon, France). The surface morphologies of the products were observed using a field-emission scanning electron microscope (FE-SEM; JSM-7500 F, JEOL, Akishima, Japan) (Figure 1).


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

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

Schematic diagram to fabricate a multilayer graphene film from polyacrylonitrile.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Schematic diagram to fabricate a multilayer graphene film from polyacrylonitrile.
Mentions: After the pyrolysis, the coated Ni layer was removed with a Ni etchant (Nickel Etchant Type TFB purchased from TRANSENE, Danvers, MA, USA) at approximately 35°C for 2 to 4 h.The synthesized graphene on the substrate was characterized by Raman spectroscopy (532 nm laser, Ramboss500I, DongWoo Optron, Republic of Korea) and Raman mapping (514.5 nm laser, ARAMIS, Horiba Jobin Yvon, France). The surface morphologies of the products were observed using a field-emission scanning electron microscope (FE-SEM; JSM-7500 F, JEOL, Akishima, Japan) (Figure 1).

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.