Identification of Single Adsorbed Cations on Mica-Liquid Interfaces by 3D Force Microscopy
Identification of Single Adsorbed Cations on Mica-Liquid Interfaces by 3D Force Microscopy
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DOI：
10.1021/acs.jpclett.7b02671
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发表时间：
2017-12-07
影响因子：
5.7
通讯作者：
Garcia, Ricardo
中科院分区：
文献类型：
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作者：
Martin-Jimenez, Daniel;Garcia, Ricardo
力显微镜提供浸入液体中的表面的原子分辨图像。界面中不同化学物质（阳离子、阴离子、水、中性原子）的存在使观察到的特征对给定物质的归属变得复杂。我们开发了一种三维原子力显微镜的方法来识别吸附在云母表面的氯化钾溶液中的阳离子。该方法基于测量Stern层内的吸引力的峰值。吸引力的最大值显示了特定地点的变化。具有最高吸引力值的位置与吸附的钾离子的存在相关联，而其他位置与水合层的局部耗尽相关联。这个标准提供了一个表面覆盖的K阳离子，这是与其他技术报告的一致。
Force microscope provides atomically resolved images of surfaces immersed in a liquid. The presence of different chemical species in the interface (cations, anions, water, neutral atoms) complicates the adscription of the observed features to a given species. We develop a 3D atomic force microscopy method to identify the cations adsorbed on a mica surface from a potassium chloride solution. The method is based on measuring the peak value of the attractive force within the Stern layer. The maximum of the attractive force shows site-specific variations. The positions with the highest attractive force values are associated with the presence of adsorbed potassium ions, while the other positions are associated with a local depletion of the hydration layer. This criterion provides a surface coverage of K cations that is consistent with the one reported by other techniques.