Correlation between Charge State of Insulating NaCl Surfaces and Ionic Mobility Induced by Water Adsorption: A Combined Ambient Pressure X-ray Photoelectron Spectroscopy and Scanning Force Microscopy

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• 作者：Albert Verdaguer ; Juan José ; Segura ; Jordi Fraxedas ; Hendrik Bluhm ; Miquel Salmeron
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：October 30, 2008
• 年：2008
• 卷：112
• 期：43
• 页码：16898-16901
• 全文大小：175K
• 年卷期：v.112,no.43(October 30, 2008)
• ISSN：1932-7455

文摘

In situ ambient pressure X-ray photoelectron spectroscopy (APPES) and scanning force microscopy were used to characterize the surface discharge induced by water layers grown on (001) surfaces of sodium chloride single crystals. The APPES studies show that both kinetic energy (KE) and full width at half-maximum (FWHM) of the Na 2s and Cl 2p core level peaks, monitored as a function of relative humidity (RH), mimic surface conductivity curves measured using scanning force microscopy. The KE position and FWHM of the core level peaks therefore are directly related to the solvation and diffusion of ions at the NaCl(100) surface upon adsorption of water.