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arXiv 0910.5841cond-mat.mes-hallcond-mat.mtrl-sci
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化学气相沉积法制备少层石墨烯及其性能研究

Growth and properties of few-layer graphene prepared by chemical vapor deposition

Hye Jin Park, Jannik Meyer, Siegmar Roth, Viera Skakalova

摘要:

研究了化学气相沉积法(CVD)制备的少层石墨烯(FLG)的结构、电学、力学和光学性能。原子分辨率透射电子显微镜(TEM)图像显示样品的高度结晶的单层部分改变为其中晶界通过化学键连接的多层域。这表明了两种不同的增长机制。CVD和碳偏析参与了生长过程,并导致了不同的结构形成.厘米尺度上的电学和力学性能的测量提供了大尺度结构连续性的证据:1)在电导率的温度依赖性中,在0 K附近的非零值表明电子输运的金属特征; 2)当用FLG(1.85GPa)覆盖时,原始聚碳酸酯膜的杨氏模量(1.37GPa)显著提高。后者表明FLG涂层的TPa数量级的非凡杨氏模量值。拉曼光谱和光学光谱支持上述结论。该样品可用作柔性透明电极,适用于特殊膜,在高分辨率TEM中检测和研究单个分子。

英文摘要:

The structure, and electrical, mechanical and optical properties of few-layer graphene (FLG) synthesized by chemical vapor deposition (CVD) on a Ni coated substrate were studied. Atomic resolution transmission electron microscope (TEM) images show highly crystalline single layer parts of the sample changing to multilayer domains where crystal boundaries are connected by chemical bonds. This suggests two different growth mechanisms. CVD and carbon segregation participate in the growth process and are responsible for the different structural formations found. Measurements of the electrical and mechanical properties on the centimeter scale provide evidence of a large scale structural continuity: 1) in the temperature dependence of the electrical conductivity, a non-zero value near 0 K indicates the metallic character of electronic transport; 2) the Young's modulus of a pristine polycarbonate film (1.37 GPa) improves significantly when covered with FLG (1.85 GPa). The latter indicates an extraordinary Young modulus value of the FLG-coating of TPa orders of magnitude. Raman and optical spectroscopy support the previous conclusions. The sample can be used as a flexible and transparent electrode and is suitable for special membranes to detect and study individual molecules in high resolution TEM.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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