The adsorption of aromatic macromolecules on graphene with entropy-tailored behavior and its utilization in exfoliating graphite
The adsorption of aromatic macromolecules on graphene with entropy-tailored behavior and its utilization in exfoliating graphite
复制标题
芳香族大分子在石墨烯上的熵定制行为吸附及其在剥离石墨中的应用
DOI：
10.1016/j.jcis.2021.04.103
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发表时间：
2021
影响因子：
9.9
通讯作者：
Liu Xiangyang
中科院分区：
文献类型：
--
作者：
Meng Chenbo;Gao Kexiong;Tiang Siyi;Zhou Linsen;Lai Wenchuan;Luo Longbo;Wang Xu;Liu Yang;Wang Ke;Chen Yue;Liu Xiangyang
Aromatic macromolecules tend to form a compact conformation after physically adsorbed on graphene and it brings about great entropy loss for physisorption, due to the strong interaction between aromatic macromolecules and graphene. However, previous researches have validated the availability of aromatic macromolecules to stabilize graphene based on physisorption. In order to clarify the underlying mechanism of this physisorption process on graphene, a series of aromatic polyamide copolymers are used as models in this research. Apart from their adsorbed conformations on graphene, the conformations of these copolymers as the free states in diluted solutions are taken into consideration. Although these copolymers present the fully extended conformation on graphene, their conformations in diluted solutions vary largely with the copolymer composition. It is verified that the copolymer with smaller conformational change could have the better stabilization effectiveness for graphene, rather than the one having stronger interaction with graphene. Therefore, the entropy-tailored behavior for the adsorption of aromatic macromolecules on graphene is put forward. Based on this mechanism, the chemical structure of aromatic polyamide is optimized and furthermore it is utilized to directly exfoliate natural graphite flakes. Eventually, high-quality graphene nanosheets with a large dimension and low defects are obtained. Moreover, its exfoliating effectiveness is superior to those of the commonly used exfoliating agents nowadays.
