在上放置状金属表面的外轴电沉积
Meagan V Kelso1, John Z Tubbesing2, Qingzhi Chen2
1Department of Materials Science and Engineering and Graduate Center for Materials Research , Missouri University of Science and Technology , Rolla , Missouri 65409-1170 , United States.
Journal of the American Chemical Society
|October 27, 2018
概括
研究人员通过电化学沉积黄金在晶片上创建了用于催化和分离的奇拉表面. 这种方法产生反体表面,使得葡萄糖反体的选择性氧化成为可能,并且避免使用昂贵的单晶体.
科学领域:
- 表面科学
- 材料化学
- 催化剂
背景情况:
- 如果缺少镜面对称性,则Achiral表面可以表现出二维性,例如面中心立方金属的 (643) 表面.
- 在非对称合成,奇拉分离和结晶的应用中,奇拉表面具有前景.
- 之前的形表面制造方法通常需要昂贵的单晶.
研究的目的:
- 阐明创建奇拉面的对称性要求.
- 开发一种使用电沉积制造化表面的方法.
- 在选择性化学过程中展示这些奇拉表面的实用性.
主要方法:
- 在商用 (Si) 晶片上以电化学方式沉积表轴金膜,其方向为 (643).
- 控制沉积以在晶圆的相反侧面产生反体Au ((643) 和Au ((6̅4̅3̅) 表面.
- 随后将其他金属 (Pt,Ni,Cu,Ag) 沉积在金上,以创建有序的多层结构.
主要成果:
- 在Si643晶片上成功制造出体黄金表面,Au{643}和Au{6̅4̅3̅}.
- 观察到额外的Au{8 14 17) 定位与分层扭曲,也表现出表面性.
- 证明这些金上沉积的其他金属具有很高的结构秩序.
- 展示了d-葡萄糖和l-葡萄糖在Ag/Au/Si (分别为643) 和Ag/Au/Si (分别为6̅4̅3̅) 的电化学氧化.
结论:
- 电化学沉积方法提供了一个可扩展的途径,可以在没有昂贵的单晶的情况下制造多种奇拉表面.
- 产生的性表面可以作为酶选择性化学反应的平台,例如葡萄糖氧化.
- 这种方法为开发新型性催化剂和分离材料开辟了道路.
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