Catalyst-free growth of carbon nanosheet from nitrogen-contained polymer

Title
Catalyst-free growth of carbon nanosheet from nitrogen-contained polymer
Authors
황상엽이성호김태욱구본철조한익
Keywords
Carbon nanosheet; Catalyst-free; polymer; nitrogen
Issue Date
2011-11
Publisher
Materials Research Society
Abstract
Recently, studies on graphene and related applications have extremely increased owing to its unique properties such as high electric conductivity, mechanical strength, and large surface area. Large-sized graphene sheet, which includes single- or multi-layer, has been synthesized using hydrocarbon gases, thin polymer films, and silicon carbide. In the two former methods, metal catalysts as a growing point have to be deposited on substrate and should be removed for application to the soft electronics, energy storage and electrodes. In the latter method, SiC is expensive to produce the graphene. Moreover, in order to synthesize nitrogen-doped graphene, doping agents such as NH3 gas and melamine (C3N6H6) should be included in the carbon sources. In this study, we have introduced a novel and simple strategy to synthesize carbon nanosheet, namely graphene, using nitrogen-contained polymer with no metal catalysts. The experimental procedures have been composed of three steps; 1) preparation of polymer nanosheet by spin coating of polyacrylonitrile (PAN) dissolved in dimethylformamide (DMF), 2) stabilization of resulting polymer nanosheet at around 300 degrees Celsius, 3) carbonization at temperature of more than 1000 degrees Celsius to develop the hexagonal structure and remove ligands bonded to the carbon atom. Nitrile group (-C≡N) in the polymer was converted into conjugated group, which is called a ladder structure, through the cyclizing reaction. The cyclized polymer nanosheet was converted to the carbon nanosheet like a graphene via healing reaction adjacent between each ladder structure. The electric conductivity, thickness, structure and other properties of the carbon sheet was characterized by four-point probe, AFM, Raman spectroscopy, HR-TEM and XPS, respectively. The characteristics of the carbon nanosheet have changed according to contents of polymer. While carbon nanosheet prepared using 0.5
URI
http://pubs.kist.re.kr/handle/201004/40983
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KIST Publication > Conference Paper
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