Song Yujiang, Yang Yi, Medforth Craig J, Pereira Eulalia, Singh Anup K, Xu Huifang, Jiang Yingbing, Brinker C Jeffrey, van Swol Frank, Shelnutt John A
Advanced Materials Laboratory, Sandia National Laboratories, and Department of Chemistry, University of New Mexico, Albuquerque, New Mexico, USA.
J Am Chem Soc. 2004 Jan 21;126(2):635-45. doi: 10.1021/ja037474t.
Seeding and autocatalytic reduction of platinum salts in aqueous surfactant solution using ascorbic acid as the reductant leads to remarkable dendritic metal nanostructures. In micellar surfactant solutions, spherical dendritic metal nanostructures are obtained, and the smallest of these nanodendrites resemble assemblies of joined nanoparticles and the nanodendrites are single crystals. With liposomes as the template, dendritic platinum sheets in the form of thin circular disks or solid foamlike nanomaterials can be made. Synthetic control over the morphology of these nanodendrites, nanosheets, and nanostructured foams is realized by using a tin-porphyrin photocatalyst to conveniently and effectively produce a large initial population of catalytic growth centers. The concentration of seed particles determines the ultimate average size and uniformity of these novel two- and three-dimensional platinum nanostructures.
以抗坏血酸作为还原剂，在水性表面活性剂溶液中进行铂盐的晶种生长和自催化还原，可得到显著的树枝状金属纳米结构。在胶束表面活性剂溶液中，可获得球形树枝状金属纳米结构，其中最小的这些纳米树枝状结构类似于连接的纳米颗粒的聚集体，且这些纳米树枝状结构为单晶。以脂质体为模板，可以制成薄圆盘状或固体泡沫状纳米材料形式的树枝状铂片。通过使用卟啉锡光催化剂方便有效地产生大量初始催化生长中心，实现了对这些纳米树枝状结构、纳米片和纳米结构泡沫形态的合成控制。种子颗粒的浓度决定了这些新型二维和三维铂纳米结构的最终平均尺寸和均匀性。
