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Ordered Assembly of α‐Quinquethiophene on a Copper Oxide Nanotemplate
Author(s) -
Cicoira Fabio,
Miwa Jill A.,
Melucci Manuela,
Barbarella Giovanna,
Rosei Federico
Publication year - 2006
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200600057
Subject(s) - copper , scanning tunneling microscope , materials science , adsorption , oxide , layer (electronics) , copper oxide , molecule , oxygen , chemical engineering , nanotechnology , chemistry , organic chemistry , metallurgy , engineering
The organic semiconductor α‐quinquethiophene (T5) is used as the active layer in organic field‐effect transistors. We have investigated the adsorption of T5 on the (110) surface of copper and on the CuO nanotemplate formed by the high‐temperature exposure of Cu(110) to molecular oxygen. The results were obtained with high‐resolution scanning tunneling microscopy (STM) under ultra‐high‐vacuum (UHV) conditions. The adsorption of T5 on copper is an important model system because it mimics the active‐layer–electrode interface in organic devices. The molecules were observed to adsorb onto both the pristine Cu(110) surface and the CuO nanotemplate, showing a greater affinity for the pristine copper surface. Surprisingly, however, the T5 molecules assembled with a much higher degree of long‐range order on the oxygen‐passivated portion of the surface.