Xiong Yujie, Chen Jingyi, Wiley Benjamin, Xia Younan, Aloni Shaul, Yin Yadong
Department of Chemistry, University of Washington, Seattle, 98195-1700, USA.
J Am Chem Soc. 2005 May 25;127(20):7332-3. doi: 10.1021/ja0513741.
Uniform cubooctahedral nanoparticles of Pd were synthesized using a modified polyol process. Like the silver system, the Pd nanoparticles underwent dissolution due to oxidative etching by Cl-/O2. In the early stage of etching, the twinned particles in a sample were selectively removed to leave behind uniform, single-crystal cubooctahedra. If the etching was allowed to continue, the single-crystal cubooctahedra were also attacked and partially dissolved. Understanding the role of oxidative etching is critical to the achievement of both uniform shape and size.
采用改进的多元醇法合成了均匀的立方八面体钯纳米颗粒。与银体系一样，钯纳米颗粒由于Cl-/O2的氧化蚀刻而发生溶解。在蚀刻的早期阶段，样品中的孪晶颗粒被选择性去除，留下均匀的单晶立方八面体。如果让蚀刻继续进行，单晶立方八面体也会受到侵蚀并部分溶解。了解氧化蚀刻作用对于实现形状和尺寸的均匀性至关重要。
