| AVS 55th International Symposium & Exhibition | |
| Biological, Organic, and Soft Materials Focus Topic | Friday Sessions |
| Session BO+SS+AS-FrM |
| Session: | Self Assembled Ultrathin Organic Interfaces |
| Presenter: | P. Cyganik, Jagiellonian University, Poland |
| Authors: | P. Cyganik, Jagiellonian University, Poland K. Szelagowska-Kunstman, Jagiellonian University, Poland M. Zharnikov, Universität Heidelberg, Germany A. Terfort, Marburg University, Germany |
| Correspondent: | Click to Email |
To fabricate aromatic self-assembled monolayers (SAMs) of practical importance for molecular electronics and other applications, high level of control over the SAMs properties should be achieved. In particular, besides monitoring the electronic properties, control of structure, i.e., crystallinity and defects, is an issue of equal importance. Our experimental approach to gain a general concept for the rational design of high-quality SAMs includes a systematic modification of the chemical composition of the SAM constituents and detailed investigation of the structure of the resulting films. Following this general idea, we studied the influence of the substitution of the headgroup atom (S versus Se, which binds SAMs constituent to the substrate) on the microscopic structure of hybrid aromatic-aliphatic SAMs formed on Au(111). The talk focuses on STM experiments1 performed for the homologue series of BPnSe (CH3-(C6H4)2-(CH2)n-Se-, n =2-6) molecules. Obtained data are discussed and analysed in view of the spectroscopic results reported by us recently for these systems2,3, as well as compared to the previously reported STM data4,5 for the corresponding thiol-based analogues, i.e. BPnS/Au(111) . The main conclusions are: (1) higher structural quality of the Se based SAMs, (2) drastic changes in the BPnSe film structure depending on either odd or even value of the parameter n, accompanied by (3) the respective odd-even changes in their thermal stability.
1 P. Cyganik et al. J. Phys. Chem. C, submited.
2 A. Shaporenko et al. 2007 J. Am. Chem. Soc. 129, 2232.
3 T. Weidner et al., J. Phys. Chem. C, submited.
4 P. Cyganik et al. 2006 J. Am. Chem. Soc. 128, 13868.
5 P. Cyganik et al. 2007 J. Phys. Chem. C. 111, 16909. .