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Sonication Exfoliation of Defect-Free Graphene in Aqueous Silk Nanofiber Solutions
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-17 00:00:00 , DOI: 10.1021/acssuschemeng.8b02644 Hongmei Zhuo 1 , Xiaoyi Zhang 2 , Lili Wang 2 , Qiang Lu 1, 2 , David L. Kaplan 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-17 00:00:00 , DOI: 10.1021/acssuschemeng.8b02644 Hongmei Zhuo 1 , Xiaoyi Zhang 2 , Lili Wang 2 , Qiang Lu 1, 2 , David L. Kaplan 3
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Green processes to exfoliate graphene would be advantageous but is challenged by issues such as stability and dispersibility. Here, stable silk fibroin nanofibers (SFNs) with high crystallinity (β-sheet content) and high net negative charge were endowed with hydrophobic features yet excellent water dispersibility. These nanofibers were used to exfoliate graphite into graphene in aqueous solutions. A high concentration (1.92 mg mL–1) and yield (approaching 20%) were achieved for the exfoliated graphene dispersions using low initial graphite concentrations via sonication treatment. This approach was superior to most protein-assisted exfoliation processes reported to date, and the graphene obtained in the process exhibited fewer defects, good conductivity, and cell compatibility. The graphene prepared by this new process provided an option for SF-graphene composite materials and devices where defect-free graphene with improved performance through the introduction of SFNs into the preparation strategies will bring a desired revolution in graphene materials.
中文翻译：
纳米丝水溶液中无缺陷石墨烯的超声剥落
剥落石墨烯的绿色工艺将是有利的，但受到诸如稳定性和分散性等问题的挑战。在此，具有高结晶度（β-片层含量）和高净负电荷的稳定的丝素蛋白纳米纤维（SFNs）具有疏水特性，但具有优异的水分散性。这些纳米纤维用于在水溶液中将石墨剥落成石墨烯。高浓度（1.92 mg mL –1使用低初始石墨浓度通过超声处理获得的片状石墨烯分散体的）和收率（接近20％）。该方法优于迄今为止报道的大多数蛋白质辅助剥离方法，并且在该方法中获得的石墨烯表现出更少的缺陷，良好的导电性和细胞相容性。通过这种新工艺制备的石墨烯为SF-石墨烯复合材料和器件提供了一种选择，其中通过将SFN引入制备策略中而性能得到改善的无缺陷石墨烯将为石墨烯材料带来理想的革命。
更新日期：2018-07-17
中文翻译：
纳米丝水溶液中无缺陷石墨烯的超声剥落
剥落石墨烯的绿色工艺将是有利的，但受到诸如稳定性和分散性等问题的挑战。在此，具有高结晶度（β-片层含量）和高净负电荷的稳定的丝素蛋白纳米纤维（SFNs）具有疏水特性，但具有优异的水分散性。这些纳米纤维用于在水溶液中将石墨剥落成石墨烯。高浓度（1.92 mg mL –1使用低初始石墨浓度通过超声处理获得的片状石墨烯分散体的）和收率（接近20％）。该方法优于迄今为止报道的大多数蛋白质辅助剥离方法，并且在该方法中获得的石墨烯表现出更少的缺陷，良好的导电性和细胞相容性。通过这种新工艺制备的石墨烯为SF-石墨烯复合材料和器件提供了一种选择，其中通过将SFN引入制备策略中而性能得到改善的无缺陷石墨烯将为石墨烯材料带来理想的革命。
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