期刊
LANGMUIR
卷 31, 期 13, 页码 3876-3883出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.5b00087
关键词
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资金
- Japanese Society for the Promotion of Science [24340068, 26600098, 26630330, 24246014]
- Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [26600101, 26630330, 26600098, 25286057] Funding Source: KAKEN
An ionic KBr(001) crystal surface covered with a thin water layer was observed with a frequency modulation atomic force microscope (FM-AFM) with atomic resolution. By immersing only the tip apex of the AFM cantilever in the thin water layer, the Q-factor of the cantilever in probing the solid-liquid interface can be maintained as high as that of FM-AFM operation in air, leading to improvement of the minimum detection of a differential force determined by the noise. Two types of images with atom-resolved contrast were observed, possibly owing to the different types of ions (K+ or Br-) adsorbed on the tip apex that incorporated into the hydration layers on the tip and on the sample surface. The force-distance characteristics at the solid-water interface were analyzed by taking spatial variation maps of the resonant frequency shift of the AFM cantilever with the high Q-factor. The oscillatory frequency shift-distance curves exhibited atomic site dependence. The roles of hydration and the ions on the tip and on the sample surface in the measurements were discussed.
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