Structures of Self-Assembled Monolayer of Squaraine Molecules Adsorbed on Highly Oriented Pyrolytic Graphite and Au(111) Substrates
Structures of Self-Assembled Monolayer of Squaraine Molecules Adsorbed on Highly Oriented Pyrolytic Graphite and Au(111) Substrates
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高取向热解石墨和Au(111)基底上吸附的方酸菁分子自组装单层结构
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发表时间：
2003
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通讯作者：
H. Shigekawa
中科院分区：
文献类型：
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作者：
S. Yasuda;H. Shigekawa
用扫描隧道显微镜(STM)研究了方酸(SQ)分子在高取向热解石墨(HOPG)和Au(111)衬底上的分子排列。在HOPG上，没有羟基的SQ分子形成了排排列，这与以前观察到的带有羟基的SQ分子的人字形结构相反，这表明化学添加的羟基在人字形排列的形成中起着重要的作用。另一方面，在Au(111)衬底上观察到的分子结构与在HOPG衬底上观察到的完全不同，这归因于SQ分子中的两个苯胺基与Au(111)晶格之间的特殊相互作用。结果表明，通过改变官能团和底物的种类，可以控制SQ分子的结构，即光吸收性质。
Molecular arrangements of squaraine (SQ) molecules formed on highly oriented pyrolytic graphite (HOPG) and Au(111) substrates in phenyloctane solution were studied by scanning tunneling microscopy (STM). On HOPG, SQ molecules without hydroxyl groups formed row arrangements, in contrast to the herringbone structures previously observed for the SQ molecules with hydroxyl groups, indicating that the chemically added hydroxyl groups play an important role in the formation of the herringbone arrangement. On the other hand, the observed molecular structures on the Au(111) substrate were completely different from those on the HOPG substrate, which was attributed to the specific interactions between the two anilino moieties in a SQ molecule and Au(111) lattices. The obtained results indicate the possibility of structural control of SQ molecules, namely, the photo-absorption property, by changing the kinds of functional groups and substrates.