Scanning Tunneling Microscopy Investigation of Ordered Thin Films of Bis(4-dioctadecylamino-phenyl) Squaraine on Highly Oriented Pyrolytic Graphite
Scanning Tunneling Microscopy Investigation of Ordered Thin Films of Bis(4-dioctadecylamino-phenyl) Squaraine on Highly Oriented Pyrolytic Graphite
复制标题
高取向热解石墨上双(4-二十八烷基氨基苯基)方酸菁有序薄膜的扫描隧道显微镜研究
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
B. Parkinson
中科院分区：
文献类型：
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作者：
M. E. S. and;B. Parkinson
扫描隧道显微镜（STM）用于研究双（4-二十八烷基氨基苯基）方酸菁（称为18-18HSQ）的二维（2D）有序结构，该结构从苯辛烷吸附到高取向热解石墨（HOPG）的（0001）表面上。在苯辛烷中较低浓度的 18-18HSQ 吸附过程中，可以在 STM 时间尺度上观察到二维有序结构的成核和生长。低和高沉积溶液浓度均可形成许多多晶型物和多层结构；然而，仅观察到单层结构是在低浓度下形成的。使用 STM 可以观察到深达三个分子的层的生长。尽管 18-18HSQ 是非手性分子，但观察到了 2D 手性多晶型物。 18-18HSQ 的二维结构的晶胞被确定与 HOPG 晶格一致。
Scanning tunneling microscopy (STM) is used to investigate the two-dimensional (2D) ordered structures of bis(4-dioctadecylamino-phenyl) squaraine (referred to as 18-18HSQ), adsorbed from phenyloctane onto the (0001) surface of highly oriented pyrolytic graphite (HOPG). Nucleation and growth of the 2D ordered structures could be observed on the STM time scale for adsorption from lower concentrations of 18-18HSQ in phenyloctane. A number of polymorphs and multiple-layer structures were formed from both low and high deposition solution concentrations; however, single-layer structures were only observed to form from low concentrations. Growth of layers up to three molecules deep could be observed with STM. Although 18-18HSQ is an achiral molecule, 2D chiral polymorphs were observed. The unit cells of the 2D structures of 18-18HSQ were determined to be coincident with the HOPG lattice.