Ultrapure multilayer graphene in bromine-intercalated graphite
Ultrapure multilayer graphene in bromine-intercalated graphite
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DOI：
10.1103/physrevb.84.041410
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发表时间：
2011-07-28
影响因子：
3.7
通讯作者：
Tanner, D. B.
中科院分区：
文献类型：
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作者：
Hwang, J.;Carbotte, J. P.;Tanner, D. B.
我们研究了溴插层高度定向热解石墨（Br-HOPG）的光学性质，并提供了数据的解释。我们观察到的吸收功能低于620毫电子伏，这是不存在的石墨的吸收光谱。将我们的结果与石墨，单层和双层石墨烯的理论研究以及最近多层石墨烯的光学研究进行比较，我们得出结论，Br-HOPG包含超纯双层石墨烯，超纯单层石墨烯和石墨的签名。所观察到的Br-HOPG的超金属导电性与我们样品中存在非常高的迁移率（在室温和非常高的载流子密度下类似或等于121 000 cm（2）V（-1）s（-1））、多层石墨烯组分相一致。这可以为单层和多层石墨烯研究提供一种途径。
We investigate the optical properties of bromine-intercalated highly orientated pyrolytic graphite (Br-HOPG) and provide an interpretation of the data. We observe absorption features below 620 meV which are absent in the absorption spectrum of graphite. Comparing our results with those of theoretical studies on graphite, single-and bilayer graphene, as well as recent optical studies of multilayer graphene, we conclude that Br-HOPG contains the signatures of ultrapure bilayer graphene, ultrapure single-layer graphene, and graphite. The observed supermetallic conductivity of Br-HOPG is identified with the presence of very high mobility (similar or equal to 121 000 cm(2)V(-1)s(-1) at room temperature and at very high carrier density), multilayer graphene components in our sample. This could provide an avenue for single-and multilayer graphene research.