Image Distortions of a Partially Fluorinated Hydrocarbon Molecule in Atomic Force Microscopy with Carbon Monoxide Terminated Tips

被引：66

作者：

Moll, Nikolaj ^{[1
]}

Schuler, Bruno ^{[1
]}

Kawai, Shigeki ^{[2
,3
]}

Xu, Feng ^{[4
]}

Peng, Lifen ^{[4
]}

Orita, Akihiro ^{[4
]}

Otera, Junzo ^{[4
]}

Curioni, Alessandro ^{[1
]}

Neu, Mathias ^{[5
]}

Repp, Jascha ^{[5
]}

Meyer, Gerhard ^{[1
]}

Gross, Leo ^{[1
]}

机构：

[1] IBM Res Zurich, CH-8803 Ruschlikon, Switzerland

[2] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[3] Japan Sci & Technol Agcy, PRESTO, CH-4056 Basel, Switzerland

[4] Okayama Univ Sci, Dept Appl Chem, Kita Ku, Okayama 7000005, Japan

[5] Univ Regensburg, Inst Expt & Appl Phys, D-93053 Regensburg, Germany

来源：

NANO LETTERS | 2014年 / 14卷 / 11期

基金：

日本科学技术振兴机构;

关键词：

Single molecule; NC-AFM;

D O I：

10.1021/nl502113z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：6127 / 6131

页数：5

共 30 条

[1] FREQUENCY-MODULATION DETECTION USING HIGH-Q CANTILEVERS FOR ENHANCED FORCE MICROSCOPE SENSITIVITY [J].