| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Nanomaterials | Tuesday Sessions |
| Session NM-TuP |
| Session: | Nanomaterials Poster Session I |
| Presenter: | Monika Jerigova, Comenius University, Bratislava, Slovakia |
| Authors: | S. Kotorova, Institute of Nuclear and Physical Engineering, FEI STU, Slovakia M. Jerigova, Comenius University, Bratislava, Slovakia D. Lorenc, International laser center, Bratislava, Slovakia M. Prochazka, Polymer Institute, Slovak Academy of Sciences, Bratislava, Slovakia D. Velic, Comenius University, Bratislava, Slovakia |
| Correspondent: | Click to Email |
Supramolecular surface nanostructures have application potential as functional devices. Studied system consists of a host molecule of monothiolated β-cyclodextrin chemically adsorbed on an Au surface through a S–Au bond (assigned as Au-S-CD) and of Fe species incorporated as the guest. Secondary-ion mass spectrometry (SIMS) is used to study the formation and composition of these surface supramolecular nanostructures.
The Fe species were prepared by pulsed laser ablation in water and thermal effusion in vacuum. Using laser ablation in water, the solution of Fe species was dropped on Au-S-CD. The relevant mass peaks were observed at 1227 m/z, 1243 m/z and 1260 m/z and were assigned to C42H68O34SNa-Fe+, C42H68O34SKFe+, C42H68O34SNa-FeO+ and C42H68O34SK-FeO+, which can be interpreted as supramolecular complexes with Fe as C42H68O34SNa-Fe and C42H68O34SK-Fe or adducts with FeO as C42H68O34SNa-FeO and C42H68O34SK-FeO, respectively.The comparison of isotope distributions with the experimental data supported the presence of a supramolecular host–guest complex between Au-S-CD and the Fe species and an adduct between Au-S-CD and FeO. The Fe species were presumably the first product of the ablation, so the formation of a supramolecular CD-Fe complex was preferential. Presumably, the second product of the ablation were the FeO species. Thermal effusion, even with a cooled surface, was negative with respect to the complex observation, no mass peaks corresponding to supramolecular complexes were observed. Nevertheless, a glucopyranose unit of the CD-S molecule and a variety of molecular fragments corresponding to CD-S associated with Fe and FeO were observed. One can assume that supramolecular complex formation is in this case also dependent on the surface diffusion of the Fe species. Since the surface diffusion of the Fe species at this low temperature might be minimized, the probability of complex formation might be close to zero.
This work was supported by VEGA 1/0400/16 .
References
[1] L. Rabara, M. Aranyosiova, D. Velic, Appl. Surf. Sci. 2011, 6, 1886–1892.
[2] S. Halaszova, M. Jerigova, D. Lorenc, D. Velic, ChemPhysChem 2015, 10,
2110–2113.