结构精确石墨烯纳米带的水相超分子自组装及其光热转换应用  

Supramolecular Self-assembly and Photothermal Conversion of Structurally Defined Graphene Nanoribbons in Aqueous Phase

作　　者：姜学松[1] JIANG Xue-song(School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University, Shanghai 200240,China)

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《功能高分子学报》2018年第5期442-445,共4页Journal of Functional Polymers

摘　　要：近年来,结构规则的石墨烯纳米带(GNRs)因具有可控的光、电、磁等物理性能而吸引了人们的广泛关注,但是,GNRs之间很强的π-π相互作用使其在溶剂中难以分散,严重阻碍了人们对其液相物化性能,以及对其超分子组装和潜在应用的研究。上海交通大学麦亦勇研究团队采用溶液合成法,合成了具有精确结构的GNRs,并在其边缘接枝亲水聚氧化乙烯(PEO)柔性链,获得一种新型的"rod-coil"大分子刷GNR-PEO。GNR-PEO在常用有机溶剂以及水中具有良好的分散性;在水中分散质量浓度可高达0.5mg/mL(GNR骨架质量浓度)。更有趣的是,GNR-PEO在水相中自组装成超长的一维条带或具有可控直径和螺距的弹簧状螺旋超分子结构。该超分子组装体在水中呈现近红外吸收,并能高效地将近红外光转换成热量。他们的研究不仅实现了GNRs的液相分散,极大拓宽了GNRs的研究范围,也证明了GNRs在光热转换领域的潜在应用,为GNRs在光热肿瘤治疗等领域的应用开发开辟了途径。Structurally well-defined graphene nanoribbons(GNRs)have attracted great interest because of their unique optical,electronic,and magnetic properties.However,strongπ-πinteractions within GNRs result in poor liquid-phase dispersibility,which impedes further investigation of these materials in numerous research areas,including supramolecular self-assembly.Recently,Mai’s group has synthesized a type of“rod-coil”brush-like macromolecules consisting of structurally defined GNRs grafted with hydrophilic poly(ethylene oxide)(PEO)chains(denoted as GNR-PEO).The PEO grafting affords the GNRs with excellent dispersibility in water with high GNRs mass concentration of up to 0.5 mg/mL.More interestingly,GNR-PEO exhibits 1D hierarchical self-assembly behavior in aqueous phase,leading to the formation of ultralong nanobelts,or spring-like helices,with tunable mean diameters and pitches.Moreover,the superstructures in aqueous dispersions are absorbed in the near-infrared range,which enable highly efficient conversion of photon energy into thermal energy.Mai’s study not only opens avenues for fundamental study of GNRs self-assembly,but also affords opportunities to extend GNRs research to a wide range of aqueous-based fields,such as photothermal tumor therapy.

关 键 词：GNRs “rod-coil”大分子刷 超分子自组装 光热转换 

分 类 号：O631[理学—高分子化学]