Materials Science & Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA.
J Colloid Interface Sci. 2011 Feb 15;354(2):597-606. doi: 10.1016/j.jcis.2010.11.032. Epub 2010 Nov 16.
Iridium (Ir) nanoparticles (NPs) of variable shapes have been synthesized via the reduction of Ir(III) ions in CTAB micellar media containing alkaline 2,7-DHN under 4h of UV-irradiation. The one-step process generates different shapes, such as nano-spheres, nano-chains, nano-flakes, and nano-needles. The synthesized Ir NPs are stable for more than a month in ambient conditions. The particles' morphology can be tuned by simply changing the surfactant-to-metal ion molar ratios and altering other reaction parameters. The mechanisms of the Ir particle formation and effects of different reaction parameters were studied in detail. The Ir nano-needles serve as a good catalyst for the reduction of organic dye molecules in presence of NaBH(4). The catalysis rate was compared by considering the electron transfer process during the reduction of the dye molecules. The present method would lead to a quick process for the synthesis of other mono-metallic, composite, and semiconductor particles with variable shapes. The Ir NPs will find promising applications in different types of organic and inorganic catalysis reactions, nanoelectronics, and biomedical applications.
通过在 CTAB 胶束介质中还原 Ir(III)离子，并在 4 小时的紫外光照射下加入碱性 2,7-DHN，合成了具有不同形状的铱（Ir）纳米粒子（NPs）。一步法可以生成不同的形状，如纳米球、纳米链、纳米片和纳米针。在环境条件下，合成的 Ir NPs 稳定一个多月。通过简单地改变表面活性剂与金属离子的摩尔比，并改变其他反应参数，可以调整颗粒的形态。详细研究了 Ir 颗粒形成的机理和不同反应参数的影响。Ir 纳米针在 NaBH(4)存在下可用作有机染料分子还原的良好催化剂。通过考虑染料分子还原过程中的电子转移过程，比较了催化速率。本方法将导致其他单金属、复合和半导体具有不同形状的颗粒的快速合成。Ir NPs 将在不同类型的有机和无机催化反应、纳米电子学和生物医学应用中找到有前途的应用。
