AVS 53rd International Symposium
    Surface Science Thursday Sessions
       Session SS2+EM-ThM

Paper SS2+EM-ThM2
Structure and Stability of Acene-SAMs

Thursday, November 16, 2006, 8:20 am, Room 2004

Session: Self-Assembled Monolayers
Presenter: D. Kaefer, Ruhr-University Bochum, Germany
Authors: D. Kaefer, Ruhr-University Bochum, Germany
G. Witte, Ruhr-University Bochum, Germany
A. Bashir, Ruhr-University Bochum, Germany
P. Cyganik, Institute of Physics Krakow, Poland
J. Mueller, University Hamburg, Germany
A. Terfort, University Hamburg, Germany
Ch. Woell, Ruhr-University Bochum, Germany
Correspondent: Click to Email
In addition to tailoring mechanical and chemical surface properties self-assembled monolayers (SAMs) have also attracted significant interest in connection with studies on molecular electronics or as contact primers for organic electronic devices. The high electrical conductivity required for the latter applications has favoured the use of aromatic SAMs which generally reveal a more complex ordering mechanism as compared to aliphatic SAMs. While an improved ordering has been achieved by using additional alklyl-units within the backbone this in turn reduces the conductivity and increases the band gap of the molecular film. Recently, we have demonstrated for the case of anthracene-2-thiol that also well ordered SAMs with a completely conjugated backbone can be prepared on Au(111).@footnote 1@ In the present study we have further varied the anchoring group and prepared also an anthracene-2-selenol SAM. Here we present a comprehensive multi-technique study (based on XPS, NEXAFS, TDS, STM and LEED measurements) on the formation, molecular structure and thermal stability of both acene-based SAMs on gold. Interestingly, a remarkably improved long-range ordering and a somewhat reduced thermal stability is obtained for the anthracene-2-selenol SAM. The different films were also analyzed theoretically in the frame of DFT calculations and the microscopic interactions and energetics of both films are compared and discussed. @FootnoteText@@footnote 1@D. Kaefer et al., J. Am. Chem. Soc. 128, 1723 (2006).