凸六面体Pt微/纳米晶体的合成,具有高指数的面体和电化学介导的形状演变
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, China.
Journal of the American Chemical Society
|December 5, 2013
概括
研究人员使用电化学方法合成了一种新的凸六合八面体 (HOH) 纳米晶体形状. 这一成就为了解和利用纳米材料的形状依赖性质打开了新的可能性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 电化学 电化学 电化学
背景情况:
- 控制纳米晶体形状对于理解材料特性至关重要.
- 实现复杂的晶体面是纳米材料合成的一个重大挑战.
研究的目的:
- 为了合成以前无法实现的复杂形状的 (Pt) 微/纳米晶体.
- 在电化学控制下研究Pt纳米晶体的形状演变.
- 为了将形状的变化与原子层次的过程相关联.
主要方法:
- 纳米晶体合成的电化学方波电位 (SWP) 方法.
- 系统地操纵电化学电位参数 (EU和EL).
- 分析晶体面演变和原子结构的分析.
主要成果:
- 成功制备了凸六面体 (HOH) Pt微/纳米晶体,具有48个 {15 5 3} 高指数面.
- 通过调整电位,实现了从四六面体 (THH) 到 HOH 到形体 (TPH) 的形状演变.
- 在形状演变过程中观察到低协调的曲折原子的减少.
结论:
- 该研究介绍了首次合成面中心立方 (fcc) 金属的HOH单晶形式.
- 形状进化是由Kink原子的竞争性溶解和Pt原子的重新配置驱动的.
- 这项工作为定制应用提供了控制Pt纳米晶体中高指数方面的途径.
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