Materials Science & Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA.
Langmuir. 2010 May 4;26(9):6720-7. doi: 10.1021/la904070n.
A new synthetic route has been utilized for the formation of multiple-shaped Pt nanoparticles (NPs) under UV-photoirradiation. The one-step process exclusively generates different shapes, such as spheres, cubes, short and long wires, and flakelike nanostructures. The reduction of Pt(IV) ions was done using alkaline 2,7-DHN in CTAB micellar media under 3 h UV-photoirradiation. The synthesized Pt NPs are stable for more than 4 months in ambient conditions. By changing the surfactant-to-metal ion molar ratios and the concentration of reducing agent, the particle size and shape can be tuned. The mechanisms of the particles formation with variable shapes and the effects of different reaction parameters are studied in detail. The present approach can be extended to a fast synthetic method for the formation of other metallic and semiconductor particles with variable shapes. The evolved Pt NPs will find promising applications in different types of organic and inorganic catalysis reactions, medicinal applications, and nanoelectronics.
一种新的合成途径已被用于在紫外光照射下形成多种形状的 Pt 纳米粒子（NPs）。该一步法专门生成不同的形状，如球体、立方体、短和长的线以及片状纳米结构。Pt(IV)离子的还原是在 CTAB 胶束介质中使用碱性 2,7-DHN 在 3 小时的紫外光照射下进行的。合成的 Pt NPs 在环境条件下稳定超过 4 个月。通过改变表面活性剂与金属离子摩尔比和还原剂的浓度，可以调节颗粒的尺寸和形状。详细研究了具有不同形状的颗粒形成的机制以及不同反应参数的影响。这种方法可以扩展到快速合成具有不同形状的其他金属和半导体颗粒的方法。所得到的 Pt NPs 将在各种类型的有机和无机催化反应、医学应用和纳米电子学中找到有前途的应用。
