纳米铂颗粒的控制生长

利用吸氢再还原法,进行逐步还原反应,合成了一系列大小的铂纳米颗粒;透射电镜和X光衍射分析表征的结果表明,铂颗粒是逐步长大的,经过32次生长,铂颗粒的平均粒径从1.8nm增加到14.1nm,平均增加步长约为0.4nm,且粒子均具较好的单分散性.

Sized-controlled Synthesis of Platinum Nanoparticles

Different size platinum nanoparticles, ranging in size from 1.8-14.1 nm, were prepared by multi-step reduction of H_ 2PtCl_ 6 by hydrogen adsorbed on platinum atoms. Transmission electronic microscopy and X-ray diffraction were used to characterize the nanoparticles. After thirty-two iterations of the reaction, the diameter of platinum nanoparticles increased from 1.8 nm to 14.1 nm. The average iterative increase was approximately 0.4 nm. The size distribution of the nanoparticles was narrow. Synthesis procedures which allow for control of platinum nanoparticle size offer the possibility for the further research into how the sizes of nano-catalysts effect catalytic activity.