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利用扫描隧道显微镜(STM)研究了4-戊氧基肉桂酸(AOCA)分子在高定向裂解石墨(HOPG)表面的光诱导结构转变.光反应前,4-戊氧基肉桂酸(AOCA)分子间在氢键作用下,在石墨表面形成稳定的有序自组装单分子层.光反应后变为无序的结构,这是由于二聚后的分子立体性较强,原来形成的二维有序结构被破坏.STM揭示了自组装层变化的分子结构细节.
The photoinduced structure transition of 4-pentoxycinnamic acid (AOCA) molecule on the surface of highly oriented pyrolytic graphite (HOPG) was investigated by scanning tunneling microscope (STM). Before photo-reaction, 4-pentoxycinnamic acid Under the action of hydrogen bond, a stable ordered self-assembled monolayer forms on the surface of graphite, which changes into a disordered structure after photoreaction, which is due to the stronger molecular stereocomplexity after dimerization. The two-dimensional Destruction of the ordered structure. STM reveals the molecular structure of self-assembled layer changes in the details.