【作者】 麦亦勇；

【Author】 Yiyong Mai;School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University;

【机构】 上海交通大学化学化工学院；

【摘要】 石墨烯纳米带(GNRs)作为下一代半导体材料之一,引起了人们的注意。其电性能受宽度和边缘的结构控制[1-6]。但由于很强π-π作用,在常用有机溶剂中的分散性差,阻碍了其液相性能、自组装等方面的研究及半导体器件的加工。我们通过自下而上化学合成,制备了具有rod-coil结构的聚环氧乙烷功能化石墨烯纳米带(GNR-PEO),使得石墨烯纳米带在常见有机溶剂中具有极好的分散性,浓度可达到1 mg/mL。利用纳米带溶液中良好的分散性,我们获得了纳米带在分散液中的光学性能,自组装结构及其在场效应晶体管中的潜在应用[2]。更重要的是,GNR-PEO可以在水中分散,并随着PEO长度不同在水中聚集成超长的一维带状或弹簧状螺旋组装体[5]。这些组装体具有高的光热转化效率,在光热肿瘤治疗领域具有潜在应用。该研究将纳米带的研究范围拓宽到了液相,特别是水相体系;为纳米带的自组装及其组装结构在半导体器件及生物技术领域的潜在应用研究开辟了道路[5]。更多还原

【Abstract】 Structurally well-defined graphene nanoribbons(GNRs) have attracted great interest due to their unique optical, electronic, and magnetic properties. However, the poor liquid-phase dispersibility of GNRs impedes their investigation in a wide range of research areas. In the present abstract, we describes the synthesis of structurally defined GNRs by a bottom-up strategy, which are grafted with hydrophilic poly(ethylene oxide)(PEO) chains of different lengths(named as GNR-PEO). The PEO grafting(42 ～ 51% grafting percentages) renders GNR-PEO excellent dispersibility in common solvents and even water with high GNR concentrations of up to 0.5 mg mL-1. The unique "rod-coil" brush-like architecture of GNR-PEO results in one-dimensional hierarchical self-assembly behavior in aqueous phase, leading to the formation of ultralong nanobelts or spring-like helices with tunable mean diameters and pitches. The superstructures in aqueous dispersions exhibit near-infrared(NIR) absorption, which endows GNR-PEO photothermal conversion capability with high efficiency upon NIR light irradiation.更多还原