四氢萘为良溶剂液/液界面法制备多级C60晶体（英文）

Hierarchically-organized C60 crystals obtained from a liquid/liquid interfacial precipitation method by using 1,2,3,4-tetrahydronaphthalene as a solvent

采用液/液界面法制备了不同形貌的多级C60结构。以四氢萘作良溶剂,异丙醇、乙醇、甲醇作不良溶剂,通过优化实验条件,成功制备了形貌特殊、界面清晰的C60晶体结构。此晶体表面粗糙度能通过乙醇洗涤得到进一步提高。通过对晶体内部形貌的观察,证实了晶体的多级自组装结构。红外、拉曼光谱和热重分析表明晶体仅由C60组成,不含溶剂分子。在纳米尺度上,通过X-射线衍射证实了分子水平上C60分子按照面心立方结构方式排列。此法制备的多级结构C60晶体比高温转变、溶剂热处理等方法更为简易,为多级材料制备提供了一条新路径。

C60 crystals have potential applications in the optoelectronics,photoconducting devices and templated synthesis fields.However,their preparation is complex.A simple liquid-liquid interfacial precipitation method was used to fabricate hierarchically-organized C60 crystals with various topographic characteristics,using 1,2,3,4-tetrahydronaphthalene as a good solvent,and isopropanol,ethanol or methanol as a poor solvent.Results indicate that the morphology and shape of the as-prepared C60 crystals vary according to the solvent combination and the ratio of good to poor solvents.The SEM images of fractured surfaces and XRD patterns of the crystals reveal that the crystals are formed by the hierarchical organization of C60 molecules at the molecular level to nanocrystals that are assembled into micrometer crystals.The crystals are composed solely of C60 molecules,without polymerization and solvents,which are arranged in a face-centered cubic lattice.The surface roughness is increased by post washing with ethanol.The methodology described here is advantageous over the high-temperature conversion and solvent annealing methods reported previously.