Tri-Stable Structural Switching in 2D Molecular Assembly at the Liquid/Solid Interface Triggered by External Electric Field
Tri-Stable Structural Switching in 2D Molecular Assembly at the Liquid/Solid Interface Triggered by External Electric Field
复制标题
外部电场触发液/固界面二维分子组装的三稳态结构切换
DOI：
10.1021/acsnano.9b01337
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发表时间：
2019
期刊：
影响因子：
17.1
通讯作者：
Wang Li Jun
中科院分区：
文献类型：
--
作者：
Li Shu Ying;Yang Xue Qing;Chen Ting;Wang Dong;Wang Sheng Fu;Wang Li Jun
不同多态性之间的三稳态结构转换存在于5-（苄氧基）戊酸衍生物（BIC-C12）在液/固界面的二维分子组装中。BIC-C12的组装结构对STM针尖和样品表面之间施加的电压敏感。一个紧凑的层状结构只观察到在正样品偏压，而多孔蜂窝结构或四边形结构是优选的在负样品偏压。通过控制样品偏压的极性和大小，实现了层状结构和蜂窝结构或四边形结构之间的选择性切换。然而，在组件中不存在蜂窝结构和四边形结构之间的过渡。这种三稳态结构转换与液相中的分子浓度密切相关。这一结果为了解外电场对分子组装的影响提供了新的思路，有利于在表面上设计和构建可切换的分子结构。
A tri-stable structural switching between different polymorphisms is presented in the 2D molecular assembly of a 5-(benzyloxy)isophthalic acid derivative (BIC-C12) at the liquid/solid interface. The assembled structure of BIC-C12 is sensitive to the applied voltage between the STM tip and the sample surface. A compact lamellar structure is exclusively observed at positive sample bias, while a porous honeycomb structure or a quadrangular structure is preferred at negative sample bias. Selective switching between the lamellar structure and the honeycomb structure or the quadrangular structure is realized by controlling the polarity and magnitude of the sample bias. The transition between the honeycomb structure and the quadrangular structure is, however, absent in the assembly. This tri-stable structural switching is closely related to the molecular concentration in the liquid phase. This result provides insights into the effect of external electric field on molecular assembly and benefits the design and construction of switchable molecular architectures on surfaces.