Bustos-Ramírez Karina, Martínez-Hernández Ana L, Martínez-Barrera Gonzalo, Icaza Miguel de, Castaño Víctor M, Velasco-Santos Carlos
Posgrado en Ciencia de Materiales, Laboratorio de Investigación y Desarrollo de Materiales Avanzados (LIDMA), Facultad de Química, Universidad Autónoma del Estado de México, Km.12 de la carretera Toluca-Atlacomulco, San Cayetano 50200, Mexico.
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, AP 1-1010, Querétaro 76000, Mexico.
Materials (Basel). 2013 Mar 7;6(3):911-926. doi: 10.3390/ma6030911.
Carbon nanostructures have played an important role in creating a new field of materials based on carbon. Chemical modification of carbon nanostructures through grafting has been a successful step to improve dispersion and compatibility in solvents, with biomolecules and polymers to form nanocomposites. In this sense carbohydrates such as chitosan are extremely valuable because their functional groups play an important role in diversifying the applications of carbon nanomaterials. This paper reports the covalent attachment of chitosan onto graphene oxide, taking advantage of this carbohydrate at the nanometric level. Grafting is an innovative route to modify properties of graphene, a two-dimensional nanometric arrangement, which is one of the most novel and promising nanostructures. Chitosan grafting was achieved by redox reaction using different temperature conditions that impact on the morphology and features of graphene oxide sheets. Transmission Electron Microscopy, Fourier Transform Infrared, Raman and Energy Dispersive spectroscopies were used to study the surface of chitosan-grafted-graphene oxide. Results show a successful modification indicated by the functional groups found in the grafted material. Dispersions of chitosan-grafted-graphene oxide samples in water and hexane revealed different behavior due to the chemical groups attached to the graphene oxide sheet.
碳纳米结构在创建基于碳的新材料领域中发挥了重要作用。通过接枝对碳纳米结构进行化学修饰，是提高其在溶剂中的分散性以及与生物分子和聚合物形成纳米复合材料时的相容性的成功举措。从这个意义上讲，壳聚糖等碳水化合物极具价值，因为它们的官能团在拓展碳纳米材料的应用方面发挥着重要作用。本文报道了利用壳聚糖在纳米层面将其共价连接到氧化石墨烯上的情况。接枝是一种创新途径，可用于修饰石墨烯（一种二维纳米排列结构，是最新型且最具前景的纳米结构之一）的性能。壳聚糖接枝是通过氧化还原反应实现的，不同的温度条件会对氧化石墨烯片的形态和特征产生影响。利用透射电子显微镜、傅里叶变换红外光谱、拉曼光谱和能量色散光谱对壳聚糖接枝氧化石墨烯的表面进行了研究。结果表明，接枝材料中发现的官能团表明修饰成功。壳聚糖接枝氧化石墨烯样品在水和己烷中的分散情况因附着在氧化石墨烯片上的化学基团而呈现出不同的行为。
