Highly wrinkled cross-linked graphene oxide membranes for biological and charge-storage applications |
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Authors: | Tang Lena A L Lee Wong Cheng Shi Hui Wong Ethel Y L Sadovoy Anton Gorelik Sergey Hobley Jonathan Lim Chwee Teck Loh Kian Ping |
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Affiliation: | Graphene Research Centre, Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore. |
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Abstract: | Inspired by the amphiphilicity of graphene oxide (GO), the surface of water is used as a template for the assembly of a GO film. Methacrylate-functionalized GO sheets can be cross-linked instantaneously at the water-air interface to form a highly wrinkled membrane spreading over an extended area. The multiple covalent linkages amongst the GO sheets enhances the in-plane stiffness of the film compared to noncovalently bonded GO films. The highly convoluted GO membrane can be used in two applications: the promoting of spontaneous stem-cell differentiation towards bone cell lineage without any chemical inducers, and for supercapacitor electrodes. Due to reduced van der Waals restacking, capacitance values up to 211 F g(-1) can be obtained. The scalable and inexpensive nature of this assembly route enables the engineering of membranes for applications in regenerative medicine and energy-storage devices where secondary structures like nanotopography and porosity are important performance enhancers. |
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Keywords: | graphene oxide thin films cross‐link stem cells capacitors |
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