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arXiv 1012.3655cond-mat.mes-hall
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化学改性石墨烯中电子输运测量:溶剂的影响

Towards electron transport measurements in chemically modified graphene: The effect of a solvent

A. Jacobsen, F. M. Koehler, W. J. Stark, K. Ensslin

摘要:

石墨烯的化学官能化改变了碳原子的局部电子密度,从而改变了电子输运。测量这些变化可以更深入地了解化学相互作用和功能化对石墨烯晶格的影响。然而,不仅化学,在这种情况下重氮化学,对电子输运有影响。后者还受到由不同处理步骤产生的缺陷和掺杂剂的影响。在这里,我们表明,在化学反应过程中使用的溶剂改变的传输特性。更详细地,所研究的异丙醇和加热处理的组合降低了掺杂浓度并显著增加了石墨烯的迁移率。此外,单独的异丙醇处理增加了掺杂剂的浓度,并引入了电子和空穴传输之间的不对称性,这可能难以与官能化的效果区分开。在这项工作中显示的结果需要仔细研究用于化学改性的溶剂的影响,以了解它们的影响。

英文摘要:

Chemical functionalization of graphene modifies the local electron density of the carbon atoms and hence electron transport. Measuring these changes allows for a closer understanding of the chemical interaction and the influence of functionalization on the graphene lattice. However, not only chemistry, in this case diazonium chemistry, has an effect on the electron transport. Latter is also influenced by defects and dopants resulting from different processing steps. Here, we show that solvents used in the chemical reaction process change the transport properties. In more detail, the investigated combination of isopropanol and heating treatment reduces the doping concentration and significantly increases the mobility of graphene. Furthermore, the isopropanol treatment alone increases the concentration of dopants and introduces an asymmetry between electron and hole transport which might be difficult to distinguish from the effect of functionalization. The results shown in this work demand a closer look on the influence of solvents used for chemical modification in order to understand their influence.

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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