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Direct Evidence of Graphene‐Induced Molecular Reorientation in Polymer Films
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2020-05-04 , DOI: 10.1002/admi.202000113
Amanda J. Carr 1 , Ashley Head 2 , Jorge Anibal Boscoboinik 2 , Surita R. Bhatia 1 , Matthew D. Eisaman 3
Affiliation  

For the first time, direct evidence of graphene‐induced molecular reorientation in polymer films using polarization modulated infrared reflection absorption spectroscopy (PM‐IRRAS) is presented. By creating favorable electrostatic interactions, graphene–polymer interfaces can be controlled by varying polymer and solvent composition. After transfer of unmodified graphene from copper onto a polymer substrate, polymer chain rearrangement relative to the orientation at the polymer‐copper interfaces is observed using PM‐IRRAS. Transfer success is characterized using both optical transmission measurements and Raman spectroscopy to quantify the transfer fidelity, that is, graphene coverage fraction. Taken together, oxygen‐containing poly(ethylene‐co‐vinyl acetate) shows more polymer chain rearrangement and better graphene coverage compared to oxygen‐free polyethylene. Polymer composition seems to dominate graphene–polymer interactions while solvent choice has a smaller effect on transfer quality. These results are the first direct measurement of this effect and point toward the possibility of engineering graphene–polymer interactions for specific applications.

中文翻译:

石墨烯诱导的聚合物薄膜分子取向的直接证据

首次提出了使用偏振调制红外反射吸收光谱(PM-IRRAS)技术在聚合物膜中石墨烯诱导的分子重新取向的直接证据。通过产生良好的静电相互作用,可以通过改变聚合物和溶剂的组成来控制石墨烯与聚合物的界面。将未改性的石墨烯从铜转移到聚合物基材上后,使用PM-IRRAS观察到相对于聚合物-铜界面上的取向的聚合物链重排。使用光学透射率测量和拉曼光谱法来表征转移成功,以量化转移保真度,即石墨烯覆盖率。两者合计,含氧聚(乙烯-与无氧聚乙烯相比,醋酸乙烯酯)表现出更多的聚合物链重排和更好的石墨烯覆盖率。聚合物的组成似乎主导着石墨烯与聚合物的相互作用,而溶剂的选择对转移质量的影响较小。这些结果是对该效果的首次直接测量,并指出了针对特定应用工程化石墨烯与聚合物相互作用的可能性。
更新日期:2020-05-04
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