期刊
SURFACE SCIENCE
卷 471, 期 1-3, 页码 1-10出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(00)00909-2
关键词
scanning tunneling microscopy; scanning tunneling spectroscopies; epitaxy; physical adsorption; self-assembly; graphite
The initial adsorption of tin phthalocyanine (SnPc) on graphite and gold surfaces was studied by low-temperature UHV-STM. At submonolayer coverages on highly oriented pyrolytic graphite (HOPG), SnPc forms substrate-defined molecular chains, while SnPc monolayers reveal dense packed structures with the molecules symmetry. A comparitive study with CuPc on HOPG reveals similar chains in the submonolayer regime. No chains were found upon SnPc adsorption onto Au(1 1 1). At ordered SnPc/HOPG films with thickness around one monolayer, local I(V) curves were collected with high reproducibility. Their wide energy gap shows the semiconductive properties of the SnPc monolayers. A strongly increased differential conductivity was observed at distinct energy values. (C) 2001 Elsevier Science B.V. All rights reserved.
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