新型C60衍生物／Ag复合纳米材料的制备及光谱性质

利用1,3-偶极环加成反应合成了联吡啶基C60单加成衍生物N-甲基-2-4′-(4″-甲基-2′,2″-联吡啶基)]-3,4-C60吡咯烷(C60BPY),并用NaBH4还原法和银溶胶直接组装法制备了C60BPY/Ag复合纳米结构。透射电子显微镜(TEM)表明,两种复合纳米结构的粒子粒径分别在30~45nm和40~55nm之间,粒子形状较规则,且分散性较好。在复合纳米结构形成过程中,C60BPY分子有效地控制了银粒子的生长和团聚,起到了很好的稳定和分散作用。紫外-可见吸收光谱中,两种复合纳米结构分别在430和490nm处出现了银纳米粒子的表面等离子体共振吸收峰,说明随着粒径的增大,吸收峰发生了红移。荧光发射光谱显示,C60BPY/Ag复合纳米体系猝灭了C60BPY在720和805nm处的发射峰,并对其机理进行了探讨。这种复合纳米体系有望在光电器件、传感器及催化领域有潜在的应用前景。

Synthesis and Spectral Properties of Novel C60 Derivative/Ag Nanocomposites

The studies on the synthesis and properties of fullerene derivatives had been an active topic in the fullerene chemistry. So synthesis of novel fullerene derivatives and their assembly with functional nanoparticles are very meaningful. In this paper a new bipyridine-substituted 60] fullerene derivative N-methyl-2-4'-(4"-methyl-2', 2"-bipyridinyl)]-3,4- 60] fulleropyrrolidine (C60 BPY) was synthesized by a 1,3-dipolar cycloaddition reaction with C60, 4-methyl-2,2'-bipyridine-4'-carbaldehyde and Sarcosine. Well-fined C60 BPY/Ag nanoparticles and nanostructure film were prepared by reduction method using NaBH4 as reagent and self-assembly approach with silver colloid, respectively. Transmission electronic microscope images showed that the diameters of two hybrid structures were about 30-45 nm and 40-55 nm, respectively. The nanoparticles were regular in shape with an uniform size distribution. The results indicated that C60 BPY molecule could effectively control the growth and aggregation of silver particles, and make them stable and dispersible well during the process of forming C60 BPY/Ag nanocomposites. The UV-Visible absorption spectra showed the surface plasma resonance peaks of silver nanoparticles at 430 and 490 nm in the two nanocomposites, respectively. A red shift of the plasma peak with increasing the size of the nanoparticles was also observed. The fluorescence emission peaks of C60 BPY at 720 and 805 nm were significantly quenched by the formation of the C60 BPY/Ag nanocomposites. Then the mechanism of quenching was discussed. These nanocomposites may have potential applications in optoelectrionic devices, sensors and catalysis.