Crespilho Frank N, Borges Thiago F C C, Zucolotto Valtencir, Leite Edson R, Nart Francisco C, Oliveira Osvaldo N Júnior
Instituto de Química de São Carlos, Universidade de São Paulo, 13560-970 Brazil.
J Nanosci Nanotechnol. 2006 Aug;6(8):2588-90. doi: 10.1166/jnn.2006.543.
Conducting polymeric nanostructures have been reported recently, which were produced from polypyrrole (PPy), including hollow nanocapsules, nanofibers, nanoporous membranes, nanowires, and nanofilms. In most cases, new synthetic routes were used aimed at controlling specific properties of these conducting nanostructures at the molecular level. In this communication we present a new chemical route to synthesize polypyrrole-based nanocomposites, in which polyamidoamine (PAMAM) dendrimers encapsulating Au nanoparticles are used as template. The two-step synthesis comprises the reduction of Au nanoparticles inside PAMAM molecules followed by PPy polymerization around the PAMAM-Au nanoparticles. The structure of the core-shell PAMAM-gold@polypyrrole nanospheres comprises a 40 nm PPy shell enclosing a core of 3 nm gold nanoparticles, as revealed by Transmission Electronic Microscopy (TEM). This new, environmentally-friendly approach may be suitable to produce hybrid nanomaterials for applications in catalysis, batteries, sensors, and micro/nanoelectronic devices.
最近报道了导电聚合物纳米结构，它们由聚吡咯（PPy）制成，包括空心纳米胶囊、纳米纤维、纳米多孔膜、纳米线和纳米薄膜。在大多数情况下，采用了新的合成路线，旨在在分子水平上控制这些导电纳米结构的特定性能。在本通讯中，我们展示了一种合成聚吡咯基纳米复合材料的新化学路线，其中封装金纳米颗粒的聚酰胺胺（PAMAM）树枝状大分子用作模板。两步合成包括在PAMAM分子内还原金纳米颗粒，然后在PAMAM-Au纳米颗粒周围进行PPy聚合。透射电子显微镜（TEM）显示，核壳结构的PAMAM-金@聚吡咯纳米球由一个40纳米的PPy壳包围着一个3纳米的金纳米颗粒核组成。这种新的、环境友好的方法可能适用于生产用于催化、电池、传感器和微/纳米电子器件的混合纳米材料。
