期刊
NANO LETTERS
卷 14, 期 11, 页码 6127-6131出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502113z
关键词
Single molecule; NC-AFM
类别
资金
- EU project ARTIST [243421]
- EU project PAMS [610446]
- ERC Advanced Grant CEMAS
- Japan Science and Technology Agency (JST) Precursory Research for Embryonic Science and Technology (PREST)
The underlying mechanisms of image distortions in atomic force microscopy (AFM) with CO-terminated tips are identified and studied in detail. AFM measurements of a partially fluorinated hydrocarbon molecule recorded with a CO-terminated tip are compared with state-of-the-art ab initio calculations. The hydrogenated and fluorinated carbon rings in the molecule appear different in size, which primarily originates from the different extents of their pi-electrons. Further, tilting of the CO at the tip, induced by van der Waals forces, enlarges the apparent size of parts of the molecule by up to 50%. Moreover, the CO tilting in response to local Pauli repulsion causes a significant sharpening of the molecule bonds in AFM imaging.
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