钨硅酸银纳米晶:形貌可控合成与表征(英文)

Ag_4SiW_(12)O_(40) Nanocrystals: Shape-controlled Synthesis and Characterization

通过聚电解质(表面活性剂)作为导向剂的液相合成路线,合成了多种形貌的多金属氧酸盐纳米晶,包括纳米球,纳米带,纳米片,纳米立方体,六角纳米粒子,三角纳米粒子,雪花状纳米粒子。形状独特的六角形空心纳米粒子也通过相似的方法合成出来。在反应过程中,银离子通过配位作用吸附在聚电解质的组装结构上,通过与氮原子或氧原子的配位作用被定位在聚电解质上,从而导致规则形貌的多酸纳米粒子的形成。结果表明,产物的形貌极大地取决于表面活性剂的组装结构和它们与反应物间的配位作用。

A large-scale synthesis of Polyoxometalates （POMs） crystalline nano-ball, -belt, -flake, -cube, -hexaprism, trigonal and snowflake-like nanocrystals was performed by a solution-phase route using polyelectrolyte （surfactant） as a structure modifier. The uniform hollow hexangular nanoparticles were also obtained by a similar solutionphase route. In this approach, Ag^＋ introduced into the solution-phase system was adhered to the polymer assembly structure by the coordination reaction. During the reaction, the coordination reaction between Ag^＋ and N or O atom makes Ag^＋ located on the aggregates of the surfactant （polyelectrolyte）, which directs the formation of regularshaped POMs nanoparticles. The results suggest that the morphology of the product is largely dependent on the assembly structure of the surfactant and the coordination between the polyelectrolyte （surfactant） and the reactant.