使用直接电化学方法合成的AuPt纳米粒子的实验和理论结构研究
Aliya S Lapp, Zhiyao Duan, Nicholas Marcella1
1Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States.
Journal of the American Chemical Society
|May 12, 2018
概括
黄金纳米颗粒上的化物终端电沉积会产生随机合金结构,而不是预期的核心外排列. 这突显了纳米级材料的行为与质量特性有何不同.
科学领域:
- 纳米材料科学
- 电化学
- 表面科学
背景情况:
- 化物终端 (HT) 电沉积在散装黄金 (Au) 表面上形成单一的 (Pt) 单层.
- 这种方法涉及PtCl4(2-) 溶液和原子封闭层,以防止多层沉积.
研究的目的:
- 通过对金纳米颗粒 (AuNPs) 的HT电沉积来制备的双金属金 (AuPt) 纳米材料的结构.
- 将纳米级结构形成与已确定的批量阶段沉积行为进行比较.
主要方法:
- 在固定的≤1.6 nm AuNP上使用HT电沉积.
- 使用电化学方法,电子显微镜,X射线吸收光谱和理论计算 (DFT和MD) 来确定结构.
主要成果:
- 观察到半随机的AuPt合金纳米粒子的形成.
- 这与在散装Au表面上看到的明确,分离的Au/Pt结构形成对比.
- 挑战了预期的纳米粒子核心结构.
结论:
- 证明了在AuNPs上的HT电沉积会产生合金结构,而不是核心外.
- 突出了宏观材料和纳米材料相位行为的关键差异.
- 强调纳米结构确定对于理解材料属性的重要性.
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