蝶翅精细分级结构纳米Ag-Au/蝶翅复合材料的可控制备
Controllable synthesis of nano Ag-Au/butterfly wings composites with mimicking fine hierarchical structure of butterfly wings

通过调控蝶翅的分步浸渍，在蝶翅模板上原位还原生成不同形状的纳米Ag-Au颗粒，并嵌入蝶翅精细分级结构得到纳米Ag-Au/蝶翅复合材料。在Ag-Au/蝶翅复合材料形成过程中，蝶翅既提供了构筑精细分级结构纳米复合材料的基体模板，又通过活性基团（如：—CONH—、—OH）参与控制Ag-Au颗粒的还原。因此，通过调控浸渍过程的温度和浸渍方式等工艺参数，得到30~50 nm的实心球状、50~80 nm空心球、不规则螺母形等不同形状的纳米Ag-Au粒子，这些纳米粒子原位沉积并均匀镶嵌在蝶翅基体上，不仅实现了对蝶翅的精细分级结构的复制，而且调控了所生成纳米Ag-Au粒子的形状。这种基于自然生物模板进行液相浸渍的制备方法为有效制备具有精细分级结构和多组分功能纳米结构的复合材料提供了重要借鉴方法。 A nature bio-template strategy was implemented to synthesize nano Ag-Au particles and display ordered arrays on butterfly wings. By a convenient procedure, the butterfly wings were immersed in ethylenediamine to increase the reactive sites on the chitin component (e.g. -CONH-and -OH functional groups), in which nano Ag particles can in situ come into being and further serve as the active sites for succedent Au deposition. The 30-50 nm solid spherical, 50-80 nm hollow spherical, irregular Ag-Au particles are loaded both on the wings' surface layer and inside the ordered array nanostructure homogeneously. This work not only replicates the fine structure of the butterfly wing, but also regulates the shape of nano Ag-Au particles. The preparation method of liquid phase impregnation based on natural biological templates provides an important reference for the effective preparation of the Ag-Au/butterfly wing composites with fine graded structure and multi-component functional nanostructures. 国家自然科学基金（51572169；51672175）；上海科学技术委员会（15ZR1422400；16520710900）