| AVS 61st International Symposium & Exhibition | |
| Surface Science | Thursday Sessions |
| Session SS+TF-ThM |
| Session: | Organic Layers on Surfaces |
| Presenter: | Jakub Ossowski, Jagiellonian University, Poland |
| Authors: | J.W. Ossowski, Jagiellonian University, Poland A. Noworolska, Jagiellonian University, Poland S. Schuster, University of Heidelberg, Germany J. Rysz, Jagiellonian University, Poland A. Terfort, University of Frankfurt, Germany M. Zharnikov, University of Heidelberg, Germany P. Cyganik, Jagiellonian University, Poland |
| Correspondent: | Click to Email |
Self-assembled monolayers (SAMs) are considered a model system in many areas on nanotechnology.1 However, potential use of SAMs strongly depends on stability of their chemical bonding to the substrate. Most of the studies of SAMs have been performed using S-Au bonding.1 More recently the Se-Au bonding is considered as an interesting alternative. However, as documented by the recent review,2 there is still missing information which of these head group provides higher stability binding to the Au(111) substrate and whether or not this relative stability depends on the type of molecular backbone i.e. aliphatic or aromatic. A meaningful comparison of S-Au and Se-Au stability requires that respective molecules not only have the same carbon backbones, but also should form ordered structures with very similar molecular packing. Only under such conditions, not fulfilled by the most of previous studies, the contribution of the molecule-substrate bonding on the film stability can be elucidated. Following this idea, we will present a new data obtained for naphthalene based SAMs bound to the Au(111) substrate via S or Se atoms.3 After presenting detailed microscopic (STM) and spectroscopic (XPS, NEXAFS) characterization of these SAMs, which exhibit very similar well-ordered structure, we will show results of two independent experiments probing the stability of their bond to the Au(111) substrate using an exchange method as well as ion-induced desorption (SIMS). We will compare these results with our previous exchange4 and recent ion-desorption experiments5 of aliphatic based systems. Irrespective of the type of molecular backbone our results clearly demonstrate much higher stability of the Se-Au bond as compared to the S-Au bond.
References
[1] C. Love , G. et al. 2005, Chem. Rev., 105, 1103.
[2] L. V. Romashov and V. P. Ananikov, 2013, Chem. Eur. J., 19, 17640.
[3] J. Ossowski, A. Noworolska, S. Schuster, J. Rysz, A. Terfort, M. Zharnikov, P. Cyganik, 2014, in preparation.
[4] K. Szelagowska-Kunstman, P. Cyganik, B Schüpbach, A. Terfort , 2010, Chem. Phys. Phys. Chem., 12, 4400.
[5] J. Ossowski, J. Rysz, M. Krawiec, D. Maciazek, Z. Postawa, A. Terfort, P. Cyganik 2014, submitted.