Eco-friendly preparation of electrically conductive chitosan - reduced graphene oxide flexible bionanocomposites for food packaging and biological applications
Eco-friendly preparation of electrically conductive chitosan - reduced graphene oxide flexible bionanocomposites for food packaging and biological applications
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DOI：
10.1016/j.compscitech.2019.01.027
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发表时间：
2019-03-22
影响因子：
9.1
通讯作者：
Nunes, Claudia
中科院分区：
文献类型：
--
作者：
Barra, Ana;Ferreira, Nuno M.;Nunes, Claudia
导电材料在生物医学和食品包装领域得到了重视。传统的导电聚合物具有有限的生物降解性和生物相容性，应该被合适的生物材料所取代。本文中，通过绿色方法制备壳聚糖和还原氧化石墨烯的导电生物纳米复合材料。还原的氧化石墨烯在咖啡酸存在下被水热还原并分散到壳聚糖中。最终的生物纳米复合材料实现了0.7 S/m的平面内和2.1 × 10（-5）S/m的平面内电导率。还原后的氧化石墨烯促进了壳聚糖基体的抗氧化活性和机械增强，提高了拉伸强度，降低了水溶性。生物纳米复合材料的导电性、机械性能和抗氧化活性可以根据填料含量进行调节。这些活性生物纳米复合材料，使用绿色方法制备，显示出良好的电气和机械性能，这使它们成为有前途的材料，用于食品包装和生物应用。
Electrically conductive materials have been highlighted in the biomedical and food packaging areas. Conventional electrically conductive polymers have limited biodegradability and biocompatibility and should be replaced by suitable biomaterials. Herein, electrically conductive bionanocomposites of chitosan and reduced graphene oxide were produced by a green methodology. The reduced graphene oxide was hydrothermally reduced in the presence of caffeic acid and was dispersed into chitosan. The final bionanocomposites achieved an electrical conductivity of 0.7 S/m in-plane and 2.1 x 10(-5) S/m through-plane. The reduced graphene oxide promoted a great enhancement of antioxidant activity and a mechanical reinforcement of chitosan matrix, increasing the tensile strength and decreasing the water solubility. The electrical conductivity, mechanical properties and antioxidant activity of the bionanocomposites can be tuned according to the filler content. These active bionanocomposites, prepared using a green methodology, revealed good electrical and mechanical properties, which make them promising materials for food packaging and biological applications.