STM study of trans-stilbene self-organized on the Ag/Ge(111)-(√3 × √3)R30° surface
Journal
Langmuir
Journal Volume
19
Journal Issue
3
Pages
822-829
Date Issued
2003
Author(s)
Abstract
The interfacial structures of trans-stilbene (TSB) on Ag/Ge(111)-( × )R30° were studied by low-temperature scanning tunneling microscopy (LT-STM) in ultrahigh vacuum (UHV). Stilbene overlayers were prepared by vapor deposition at a substrate temperature of 200 K and imaged after the samples were cooled to 100 K. High-resolution images allow the identification of individual molecules, with TSB appearing with a distinctive dumbbell shape. From in situ observation of the substrate lattice, the TSB monolayers were found to form a (2 × 1) structure. Due to the excellent matching of unit cell length for Ag/Ge(111)-( × )R30° to the molecular length of TSB, the interaction between TSB and the substrate surface plays the controlling role in influencing the structure of the TSB overlayers. A model for the unit cell of TSB monolayers is proposed and discussed.
Publisher
American Chemical Society
Type
journal article