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    Free-Standing Janus Graphene Oxide with Anisotropic Properties for 2D Materials as Surfactant

    Year: 2019

    Journal: ACS Appl. Nano Mater., Volume 2, JUL, page 4203–4210

    Authors: Lee, Hoyeon; Choi, Ki-In; Choi, Jae-Hak; Yoo, Jeseung; Seo, Young-Soo; Satija, Sushil; Koo, Jaseung

    Organizations: Chungnam National University; National Research Foundation of KoreaNational Research Foundation of Korea [2017M2A2A6A01019911]

    Keywords: Janus graphene oxide; Langmuir-Schaefer technique; free-standing structure; grafting polymers; amphiphilic properties; wrinkled structure; neutron reflectivity

    We present a simple and facile approach to creating asymmetrically modified graphene oxide sheets by grafting polymers with different polarities. Single-layered Janus graphene derivatives were prepared by grafting polymers with different polarities at the liquid gas interface through one step functionalization. This approach allows obtaining free-standing monolayers of Janus graphene oxide sheets for large area, and also controlling the morphology (i.e., wrinkled Janus graphene oxide sheets) by a compression monolayer. A neutron reflectivity technique is used to check the functionalization on each side of the monolayer, and the results are compared with contact angles to determine its amphiphilic nature. The free-standing Janus monolayers become robust after UV-irradiation, and are able to withstand various solvents. Because these robust Janus graphene films can maintain their anisotropic functionalities over time, this technique provides a new strategy for fabricating functional materials that require amphiphilic properties (i.e., oil-water separation membranes and chemical compatibilizers functioning as a 2D surfactant) and different electrical functionalities (i.e., flexible lightweight p-n junction semiconductors and stimuli-driven actuators).
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