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Controlled Synthesis of Monolayer Graphene Toward Transparent Flexible Conductive Film Application.

Lee BJ, Yu HY, Jeong GH - Nanoscale Res Lett (2010)

Bottom Line: To optimize the synthesis condition, we investigated the effects of synthetic temperature and cooling rate in the ranges of 850-1,000°C and 2-8°C/min, respectively.It was found that a cooling rate of 4°C/min after 1,000°C synthesis is the most effective condition for monolayer graphene production.We also successfully transferred as-synthesized graphene films to arbitrary substrates such as silicon-dioxide-coated wafers, glass, and polyethylene terephthalate sheets to develop transparent, flexible, and conductive film application.

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ABSTRACT
We demonstrate the synthesis of monolayer graphene using thermal chemical vapor deposition and successive transfer onto arbitrary substrates toward transparent flexible conductive film application. We used electron-beam-deposited Ni thin film as a synthetic catalyst and introduced a gas mixture consisting of methane and hydrogen. To optimize the synthesis condition, we investigated the effects of synthetic temperature and cooling rate in the ranges of 850-1,000°C and 2-8°C/min, respectively. It was found that a cooling rate of 4°C/min after 1,000°C synthesis is the most effective condition for monolayer graphene production. We also successfully transferred as-synthesized graphene films to arbitrary substrates such as silicon-dioxide-coated wafers, glass, and polyethylene terephthalate sheets to develop transparent, flexible, and conductive film application.

No MeSH data available.


Optical microscope images of synthesized graphenes with different cooling rates: a 8°C/min, b 6°C/min, c 4°C/min, and d 2°C/min
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Figure 4: Optical microscope images of synthesized graphenes with different cooling rates: a 8°C/min, b 6°C/min, c 4°C/min, and d 2°C/min

Mentions: Next, we investigated the effect of cooling rate on the thickness uniformity of graphene since we expected that the carbon precipitation and diffusion on the Ni surface are critical to determining the number of graphene layers and large area synthesis. We fixed the synthesis temperature (1,000°C) and gas composition (CH4:H2 = 5 sccm:1,500 sccm) so that we could ensure the same condition in the amount of carbon influx and decomposed carbon species. The cooling rate after the 1,000°C synthesis was changed to 8, 6, 4, and 2°C/min; their optical images are shown in Fig. 4a–4d, respectively.


Controlled Synthesis of Monolayer Graphene Toward Transparent Flexible Conductive Film Application.

Lee BJ, Yu HY, Jeong GH - Nanoscale Res Lett (2010)

Optical microscope images of synthesized graphenes with different cooling rates: a 8°C/min, b 6°C/min, c 4°C/min, and d 2°C/min
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC2964468&req=5

Figure 4: Optical microscope images of synthesized graphenes with different cooling rates: a 8°C/min, b 6°C/min, c 4°C/min, and d 2°C/min
Mentions: Next, we investigated the effect of cooling rate on the thickness uniformity of graphene since we expected that the carbon precipitation and diffusion on the Ni surface are critical to determining the number of graphene layers and large area synthesis. We fixed the synthesis temperature (1,000°C) and gas composition (CH4:H2 = 5 sccm:1,500 sccm) so that we could ensure the same condition in the amount of carbon influx and decomposed carbon species. The cooling rate after the 1,000°C synthesis was changed to 8, 6, 4, and 2°C/min; their optical images are shown in Fig. 4a–4d, respectively.

Bottom Line: To optimize the synthesis condition, we investigated the effects of synthetic temperature and cooling rate in the ranges of 850-1,000°C and 2-8°C/min, respectively.It was found that a cooling rate of 4°C/min after 1,000°C synthesis is the most effective condition for monolayer graphene production.We also successfully transferred as-synthesized graphene films to arbitrary substrates such as silicon-dioxide-coated wafers, glass, and polyethylene terephthalate sheets to develop transparent, flexible, and conductive film application.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
We demonstrate the synthesis of monolayer graphene using thermal chemical vapor deposition and successive transfer onto arbitrary substrates toward transparent flexible conductive film application. We used electron-beam-deposited Ni thin film as a synthetic catalyst and introduced a gas mixture consisting of methane and hydrogen. To optimize the synthesis condition, we investigated the effects of synthetic temperature and cooling rate in the ranges of 850-1,000°C and 2-8°C/min, respectively. It was found that a cooling rate of 4°C/min after 1,000°C synthesis is the most effective condition for monolayer graphene production. We also successfully transferred as-synthesized graphene films to arbitrary substrates such as silicon-dioxide-coated wafers, glass, and polyethylene terephthalate sheets to develop transparent, flexible, and conductive film application.

No MeSH data available.