Effects of a modular two-step ozone-water and annealing process on silicon carbide graphene
Effects of a modular two-step ozone-water and annealing process on silicon carbide graphene
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DOI：
10.1063/1.4893781
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发表时间：
2014-08
影响因子：
4
通讯作者：
M. Webb;C. Polley;K. Dirscherl;G. Burwell;P. Palmgren;Y. Niu;A. Lundstedt;A. Zakharov;O. Guy;T. Balasubramanian;R. Yakimova;H. Grennberg
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文献类型：
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作者：
M. Webb;C. Polley;K. Dirscherl;G. Burwell;P. Palmgren;Y. Niu;A. Lundstedt;A. Zakharov;O. Guy;T. Balasubramanian;R. Yakimova;H. Grennberg
通过将臭氧和水结合起来，在超高真空中高温退火后评估了将碳化硅上的外延石墨烯暴露于侵蚀性湿化学工艺的影响。臭氧在水中的分解产生许多氧化物质，然而，尽管长时间暴露于臭氧水溶液环境，但在两步过程后没有观察到氧化石墨烯。该系统进行了全面的特点之前和之后的处理，使用拉曼光谱，芯级光电子能谱，角分辨光电子能谱连同低能电子衍射，低能电子显微镜，原子力显微镜。尽管存在水-臭氧反应环境的化学势，但石墨烯域在很大程度上不受影响，从而提高了采用这种简单的化学和退火方案来清洁或制备外延石墨烯表面的前景。
By combining ozone and water, the effect of exposing epitaxial graphene on silicon carbide to an aggressive wet-chemical process has been evaluated after high temperature annealing in ultra high vacuum. The decomposition of ozone in water produces a number of oxidizing species, however, despite long exposure times to the aqueous-ozone environment, no graphene oxide was observed after the two-step process. The systems were comprehensively characterized before and after processing using Raman spectroscopy, core level photoemission spectroscopy, and angle resolved photoemission spectroscopy together with low energy electron diffraction, low energy electron microscopy, and atomic force microscopy. In spite of the chemical potential of the aqueous-ozone reaction environment, the graphene domains were largely unaffected raising the prospect of employing such simple chemical and annealing protocols to clean or prepare epitaxial graphene surfaces.