Wiley Benjamin, Sun Yugang, Mayers Brian, Xia Younan
Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.
Chemistry. 2005 Jan 7;11(2):454-63. doi: 10.1002/chem.200400927.
The concept of shape-controlled synthesis is discussed by investigating the growth mechanisms for silver nanocubes, nanowires, and nanospheres produced through a polymer-mediated polyol process. Experimental parameters, such as the concentration of AgNO(3) (the precursor to silver), the molar ratio between poly(vinylpyrrolidone) (PVP, the capping agent) and AgNO(3), and the strength of chemical interaction between PVP and various crystallographic planes of silver, were found to determine the crystallinity of seeds (e.g., single crystal versus decahedral multiply twinned particles). In turn, the crystallinity of a seed and the extent of the PVP coverage on the seed were both instrumental in controlling the morphology of final product. The ability to generate silver nanostructures with well-defined morphologies provides a great opportunity to experimentally and systematically study the relationship between their properties and geometric shapes.
通过研究聚合物介导的多元醇法制备的银纳米立方体、纳米线和纳米球的生长机制，讨论了形状控制合成的概念。实验参数，如硝酸银（银的前驱体）的浓度、聚乙烯吡咯烷酮（PVP，封端剂）与硝酸银的摩尔比以及PVP与银的各种晶面之间的化学相互作用强度，被发现决定了晶种的结晶度（例如，单晶与十面体多重孪晶颗粒）。反过来，晶种的结晶度和PVP在晶种上的覆盖程度都有助于控制最终产物的形态。生成具有明确形态的银纳米结构的能力为实验性和系统性地研究其性质与几何形状之间的关系提供了绝佳机会。
