電化學剝離奈米石墨片性質研究

葛春明

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電化學剝離奈米石墨片性質研究

葛春明 , Ph.D　　Advisor：陳志臣　　

繁體中文

電化學剝離；雙層石墨烯片；寡層石墨烯；石墨烯墨水；透明電極；熱傳導； Electrochemical exfoliation ； Bilayer graphene sheets ； Few-layer graphene ； Graphene ink ； Transparent electrodes ； Heat conduction

Abstract │ Reference (116) │ Altmetrics

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This study proposes an approach to synthesis graphite nano-plates by electrochemical exfoliation (EC) with graphite bulks as raw materials, where the graphite was manufactured artificially from thermoforming of natural graphite and pitch with different temperatures. Based on such electrochemical exfoliation method, the effects of thermal treatment temperatures and different graphite raw materials on the properties of exfoliated nano-plates were investigated. The quality of graphite nano-plates was identified by Raman spectroscopy. The morphologies of the samples were carried out by optical microscope (OM) and scanning electron microscope (SEM). Atomic force microscopy (AFM) was used to measure the thickness of graphite nano-plates. X-ray Photoelectron Spectroscopy (XPS) or Electron Spectroscopy for Chemical Analysis (ESCA) was used to identify the surface functional groups.
  In this study, the expansive high-purity graphite rods, single-crystal natural graphite flake or highly oriented pyrolytic graphite (HOPG), were frequently used in industry, were replaced by our prepared artificial graphite. The as prepared graphite, as electrode in EC process, was made from natural graphite flakes, vein graphite and pitch as starting materials. The results indicate that graphite nano plates can be successfully obtained with high quality and large-scale production by using as-prepared artificial graphite. Moreover, it was found out that the lateral size of exfoliated nano-plates was independent to the heat treatment temperatures of as-prepared graphite. With specific cutting orientation in Z-axis direction, the graphite edge were observed to be highly exposed, leading to larger size (1.5-2 times), few-layered and excellent uniform of graphene nano-plates after subjected to EC process. Compare our prepared graphite with natural graphite, it was found out the lateral size distribution of exfoliated nano-plates was about ten microns, which was larger than that of vein graphite(about several hundred nanometers to several microns). This is possibly due to the lower ordering of graphitic orientation on vein graphite. However, it was worthy noting that the thickness of nano-plates was roughly the same.
  For particle application, it was demonstrated that transparent conducting films could be made by the suspended graphite nano-plates, the so-called graphene-ink. The sample was coated on transparent substrate by air spraying method. The results show that the sheet resistance was 1.35 x 105 Ω/square with 70% light transmittance. The resistance of the films can be significantly decreased by post-treatment, indicating that the sheet resistance may decrease to 16–24% after thermal treatment. The graphene paper fabricated through filtration process provides the highly quality and massive graphene sheets. The paper thickness was about 5 μm. The in-plane and cross-plane thermal conductivity of the graphene paper can reach about 600 and 5.5 W/m•K measured by the laser flash method respectively. The in-plane thermal conductivity was higher than most metal and lower cost. The local heat spot was transferred much faster to be spread out in the horizontal direction. Moreover, the additional advantage of graphene paper was mainly on the ultra-thin thickness when compared to that of most commercial thermal interface materials (TIMs). The as-prepared graphene paper shows potential to be high performance thermal conductivity material in the future.

Reference ( 116 ) 〈TOP〉

[1]F. Qin and C. Brosseau, ”A review and analysis of microwave absorption in polymer composites filled with carbonaceous particles”, Journal of Applied Physics, 111 (6), 061301, 2012.
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[4]Nobuyuki Murofushi, “Focusing on the commercial aspect of carbon”, Tanso, 248, 105-111, 2011.
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[6]S. Iijima, “Helical Microtubules of Graphitic Carbon”, Nature, 354 (6348), 56-58, 1991.
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[7]S. Cui, P. Scharff, C. Siegmund, D. Schneider, K. Risch, S. Klötzer, L. Spiess, H. Romanus and J. Schawohl, “Investigation on reparation of Multiwalled Carbon Nanotubes by DC Arc Discharge Under N2 Atmosphere”, Carbon, 42 (5), 931-939, 2004.
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[8]S. Noriaki, “Formation of Multi-Shelled Carbon Nanoparticles by Arc Discharge in Liquid Benzene”, Materials Chemistry and Physics, 88, 235- 238, 2004.
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