Submolecular features of epitaxially grown PTCDA on Cu(111) analyzed by force field spectroscopy

被引：7

作者：

Braun, D-A ^{[1
,2
]}

Weiner, D. ^{[1
,2
]}

Such, B. ^{[3
]}

Fuchs, H. ^{[1
,2
]}

Schirmeisen, A. ^{[1
,2
]}

机构：

[1] Univ Munster, Inst Phys, D-48149 Munster, Germany

[2] CeNTech, D-48149 Munster, Germany

[3] Jagiellonian Univ, Marian Smoluchowski Inst Phys, Krakow, Poland

来源：

NANOTECHNOLOGY | 2009年 / 20卷 / 26期

关键词：

ATOMIC-RESOLUTION; SURFACES;

D O I：

10.1088/0957-4484/20/26/264004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Submolecular features of epitaxially grown 3,4,9,10-perylenetetra-carboxylic-dianhydride (PTCDA) on Cu(111) are resolved in non-contact atomic force microscopy topography scans in ultrahigh vacuum. While molecules in the first layer above the Cu substrate are depicted as featureless ovals, the second layer molecules show an intramolecular structure with a height corrugation of up to 40 pm. Force field spectroscopy experiments with submolecular resolution show that the tip-molecule forces differ significantly on the first and second layer molecules. Possible contributions to these force differences from mechanical deformations of the molecules as well as the internal charge density distribution are discussed.

引用

页数：6