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Preparation of conductive polyaniline grafted graphene hybrid composites via graft polymerization at room temperature

机译：室温下接枝聚合制备导电聚苯胺接枝石墨烯杂化复合材料

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摘要

Graphene was covalently functionalized with phenol groups via a 1,3-dipolar cycloaddition reaction without degrading its electronic properties. The most important thing is that two hydroxyl groups can be covalently attached to the graphene sides in a single step. Here, the phenols on the functionalized graphene have been further derivatized with gamma- aminopropyltriethoxysilane to form a dense aminopropylsilane self assembled monolayer with active sites for the graft polymerization of aniline. The conductive polyaniline layer was chemically grafted on the surface of the self assembled monolayer coated graphene by in situ polymerization of the aniline monomer in the presence of ammonium peroxodisulfate under acidic conditions. This reaction was found to be extremely efficient for producing conductive polyaniline-graphene hybrid composites, even at room temperature and short reaction times (24 h), and was usually performed using graphene oxide. The chemical grafting of PANI was confirmed using Fourier transform infrared spectroscopy. Thermogravimetric analysis indicated that the polymer functionalized graphene consisted of 24.5 wt% polymer. The morphologies of the polyaniline grafted graphene hybrid composites and hydroxyl functionalized graphene were examined by scanning electron microscopy and transmission electron microscopy, showing relatively uniform polymer coatings on the sides of graphene.
机译：石墨烯通过1，3-偶极环加成反应与酚基共价官能化，而不会降低其电子性能。最重要的是，两个羟基可以在一个步骤中共价连接到石墨烯侧。在此，官能化石墨烯上的酚已进一步用γ-氨基丙基三乙氧基硅烷衍生化，形成了具有用于苯胺接枝聚合反应的活性位点的致密氨基丙基硅烷自组装单层。通过在酸性条件下在过二硫酸铵存在下苯胺单体的原位聚合，将导电聚苯胺层化学接枝到自组装单层涂覆石墨烯的表面上。发现该反应即使在室温和短反应时间（24h）下对于生产导电聚苯胺-石墨烯杂化复合物也是极其有效的，并且通常使用氧化石墨烯进行。使用傅里叶变换红外光谱法确认了PANI的化学接枝。热重分析表明，聚合物官能化的石墨烯由24.5重量％的聚合物组成。通过扫描电子显微镜和透射电子显微镜检查了聚苯胺接枝的石墨烯杂化复合物和羟基官能化的石墨烯的形态，显示出在石墨烯侧面上相对均匀的聚合物涂层。

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