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Crystals 2018, 8(12), 449;

Growth of Ordered Graphene Ribbons by Sublimation Epitaxy

National Research Center of Engineering Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha 410128, China
Key Laboratory of Ministry of Education for Tea Science, Hunan Agricultural University, Changsha 410128, China
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Authors to whom correspondence should be addressed.
Received: 22 October 2018 / Revised: 28 November 2018 / Accepted: 28 November 2018 / Published: 30 November 2018
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Ordered graphene ribbons were grown on the surface of 4° off-axis 4H-SiC wafers by sublimation epitaxy, and characterized by using scanning electron microscopy (SEM), atomic force microscopy (AFM) and micro-Raman spectroscopy (μ-Raman). SEM showed that there were gray and dark ribbons on the substrate surface, and AFM further revealed that these ordered graphene ribbons had clear stepped morphologies due to surface step-bunching. It was shown by μ-Raman that the numbers of graphene layers of these two types of regions were different. The gray region was composed of mono- or bilayer ordered graphene ribbon, while the dark region was of tri- or few-layer ribbon. Meanwhile, ribbons were all homogeneous and had a width up to 40 μm and a length up to 1000 μm, without micro defects such as grain boundaries, ridges, or mono- and few-layer graphene mixtures. The results of this study are useful for optimized growth of high-quality graphene film on silicon carbide crystal. View Full-Text
Keywords: graphene; ribbon; 4H-SiC; sublimation; epitaxy; Raman graphene; ribbon; 4H-SiC; sublimation; epitaxy; Raman

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Cai, S.; Liu, X.; Zheng, X.; Liu, Z. Growth of Ordered Graphene Ribbons by Sublimation Epitaxy. Crystals 2018, 8, 449.

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