Structural selection of graphene supramolecular assembly oriented by molecular conformation and alkyl chain
Structural selection of graphene supramolecular assembly oriented by molecular conformation and alkyl chain
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分子构象和烷基链定向石墨烯超分子组装体的结构选择
DOI：
10.1073/pnas.0809427105
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发表时间：
2008-11-04
影响因子：
11.1
通讯作者：
Yang, Jin-Long
中科院分区：
文献类型：
--
作者：
Chen, Qing;Chen, Ting;Yang, Jin-Long
石墨烯分子，具有n-碳烷基链（FTOC-Cn，n = 4,6,8,12）和Janus型“双凹”构象的六氟三苯并[a,g,m]晕苯，用于在高度取向的热解石墨表面上进行自组装。通过扫描隧道显微镜和密度泛函理论计算研究了自组装体与分子构象和烷基链的结构依赖性。由于氢键的存在，在 FTBC-C4 组装中观察到有趣的反面“上下”方式。随着烷基链长度的增加和范德华相互作用的增强，分子在自组装过程中不再采取交替的“上下”方向，并根据分子间和分子-基底相互作用之间的平衡组织成各种具有层状、六边形蜂窝和假蜂窝结构的吸附层。结果表明，特征性的“双凹”分子可用于设计石墨烯纳米图案。从扫描隧道光谱测量结果发现，特征石墨烯分子吸附在固体表面时，其电子特性得以保留。
Graphene molecules, hexafluorotribenzo[a,g,m]coronene with n-carbon alkyl chains (FTOC-Cn, n = 4, 6, 8, 12) and Janus-type "double-concave" conformation, are used to fabricate self-assembly on highly oriented pyrolytic graphite surface. The structural dependence of the self-assemblies with molecular conformation and alkyl chain is investigated by scanning tunneling microscopy and,density functional theory calculation. An interesting reverse face "up-down" way is observed in FTBC-C4 assembly due to the existence of hydrogen bonds. With the increase of the alkyl chain length and consequently stronger van der Waals interaction, the molecules no longer take alternating "up-down" orientation in their self-assembly and organize into various adlayers with lamellar, hexagonal honeycomb, and pseudohoneycomb structures based on the balance between intermolecular and molecule-substrate interactions. The results demonstrate that the featured "double-concave" molecules are available block for designing graphene nanopattern. From the results of scanning tunneling spectroscopy measurement, it is found that the electronic property of the featured graphene molecules is preserved when they are adsorbed on solid surface.