Detection of graphene chirality using achiral liquid crystalline platforms
Detection of graphene chirality using achiral liquid crystalline platforms
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DOI：
10.1063/1.4931147
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发表时间：
2015-09-21
影响因子：
3.2
通讯作者：
Garvey, Alfred
中科院分区：
文献类型：
--
作者：
Basu, Rajratan;Kinnamon, Daniel;Garvey, Alfred
单层石墨烯薄片以低浓度分散成两种非手性液晶（LCs）：烷氧苯基苯甲酸酯（9OO4）和4-氰基-4′-戊基联苯（5CB）。石墨烯的存在导致LC中存在两种类型的手性特征：9OO4的近晶a相中的电斜效应（LC指向器的极性倾斜垂直于外加电场，并在外加电场中呈线性），以及5CB的向列相中的LC指向器的宏观螺旋扭曲。石墨烯薄片一般具有应变手性和边缘手性。LC分子与手性石墨烯薄片之间的非共价相互作用诱导LC分子构象去消旋，表现出大块电斜效应和宏观螺旋扭曲。
Monolayer graphene flakes were dispersed at low concentrations into two achiral liquid crystals (LCs) alkoxyphenylbenzoate (9OO4) and 4-cyano-4'-pentylbiphenyl (5CB), separately. The presence of graphene resulted in two types of chiral signatures in the LCs: an electroclinic effect (a polar tilt of the LC director perpendicular to, and linear in, an applied electric field) in the smectic-A phase of 9OO4, and a macroscopic helical twist of the LC director in the nematic phase of 5CB. Graphene flakes generally possess strain chirality and edge chirality. The non-covalent interactions between the LC molecules and chiral graphene flakes induce molecular conformational deracemization in the LC, exhibiting a bulk electroclinic effect and a macroscopic helical twist.