Adsorption of Hexacontane on Hexagonal Boron Nitride
Adsorption of Hexacontane on Hexagonal Boron Nitride
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DOI：
10.1021/acs.jpcc.8b10167
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发表时间：
2018-12-06
影响因子：
3.7
通讯作者：
Beton, Peter H.
中科院分区：
文献类型：
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作者：
Albar, Juan D.;Korolkov, Vladimir V.;Beton, Peter H.
利用原子力显微镜（AFM）研究了六方氮化硼（hBN）对正己烷（C60H122）的吸附。这些分子可以通过升华或溶液沉积，并在三个不同的旋转域中形成尺寸为0.1-1 μ m的片层行。高分辨率AFM图像显示，与石墨上的烷烃类似，分子平行于hBN的晶格向量被吸附，我们使用分子力学表明，这对应于最低能量配置。即使沉积了几层六正烷，也可以观察到具有相同周期性的片层行，尽管这些多层中存在一些定向紊乱。我们还观察到六正烷的热诱导改性，包括再结晶。我们将我们的结果与最近的烷烃在hBN上吸附的x射线研究结果进行了比较，并讨论了烷烃在hBN上引导分子自组装的可能作用。
We have investigated the adsorption of hexacontane (C60H122) on hexagonal boron nitride (hBN) using atomic force microscopy (AFM). The molecules can be deposited either by sublimation or from solution and form lamellar rows with dimensions of the order of 0.1-1 mu m in three different rotational domains. High-resolution AFM images reveal that, similar to alkanes on graphite, the molecules are adsorbed parallel to the lattice vectors of hBN and we show using molecular mechanics that this corresponds to the lowest energy configuration. Lamellar rows with the same periodicity are observed even when several layers of hexacontane are deposited, although there is some orientational disorder in these multilayers. We also observe heat-induced modification of hexacontane, including recrystallization. We compare our results with recent X-ray studies of alkane adsorption on hBN and discuss the possible role of alkanes on steering molecular self-assembly on hBN.