Ujihara Masaki
Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology.
J Oleo Sci. 2018;67(6):689-696. doi: 10.5650/jos.ess17262.
This review discusses wet processes to synthesize metallic nanoparticles with many surface projections. Such projections can be formed by the aggregation of seed nanoparticles or by anisotropic crystal growth from specific facets on a base nanoparticle. The aggregation process can be controlled by protecting agents, which also play a key role in determining the morphology of the projections and the size of the nanoparticles. The reducing agents used for this purpose are mostly moderate and therefore allow seed aggregation before crystal growth. Some reducing agents act catalytically on specific crystal facets to promote anisotropic crystal growth. Branched nanostructures with high symmetry can be prepared from monocrystalline nanoparticles by site-selective growth and etching. The optical and plasmonic properties of the nanoparticles thus obtained can be used for various applications in surface-enhanced spectroscopy and in plasmon photocatalysts.
本综述讨论了合成具有许多表面突起的金属纳米颗粒的湿法工艺。这种突起可以通过种子纳米颗粒的聚集形成，也可以通过在基底纳米颗粒上特定晶面的各向异性晶体生长形成。聚集过程可以由保护剂控制，保护剂在确定突起的形态和纳米颗粒的尺寸方面也起着关键作用。用于此目的的还原剂大多是温和的，因此在晶体生长之前允许种子聚集。一些还原剂对特定晶面起催化作用以促进各向异性晶体生长。具有高对称性的分支纳米结构可以通过单晶纳米颗粒的位点选择性生长和蚀刻来制备。由此获得的纳米颗粒的光学和等离子体性质可用于表面增强光谱学和等离子体光催化剂的各种应用。
