石墨老化对其湿性和气态纳米领域的表面阻塞的影响
1Department of Electrochemical Materials, J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 2155/3, CZ-182 23 Prague 8, Czech Republic.
Langmuir : the ACS journal of surfaces and colloids
|September 21, 2023
概括
高排序的烧解石墨 (HOPG) 表面在老化时会形成气态纳米域,阻碍水性接触. 这些纳米领域是由于不完整的湿和冲击固体液体接口过程而形成的.
科学领域:
- 表面科学是一门学科.
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 传统上,高度排序的烧解石墨 (HOPG) 的基层平面被视为疏水和惰性.
- 新准备的HOPG表面有轻微的水友性,但在环境空气中老化会增加水接触角度.
- 衰老归因于碳化合物吸附,导致电子转移动力学减少,机制不清楚.
研究的目的:
- 为了研究浸入水中的新鲜制备和老化的HOPG的表面特征.
- 为了阐明电子转移动力学在老化HOPG表面的衰变背后的机制.
- 了解表面变化在固体-液体界面相互作用中的作用.
主要方法:
- 使用PeakForce定量纳米机械成像来检查HOPG表面.
- 在水性介质中浸泡的新鲜剥离和老化的基底平面HOPG的比较.
- 分析表面地形和湿特性.
主要成果:
- 沉浸在水中的老化HOPG表面被环境气态纳米领域覆盖.
- 这些纳米领域是由于不完全湿而产生的,占据了老化表面的高达60%.
- 在新剥离的HOPG表面上没有气态纳米域.
- 纳米领域的发生率与石墨老化时间直接相关.
结论:
- 环境气体纳米域在老化HOPG上形成,原因是不完全湿透.
- 这些纳米领域起到屏障作用,防止老化的HOPG与水性介质接触.
- 纳米领域的存在显著影响了老年HOPG的固体-液体界面发生的过程.
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