| AVS 64th International Symposium & Exhibition | |
| Surface Science Division | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session |
| Presenter: | Chuan He, University of Delaware |
| Authors: | C. He, University of Delaware A.V. Teplyakov, University of Delaware |
| Correspondent: | Click to Email |
The attachment of phthalocyanine molecules to solid surfaces has attracted substantial attention due to the unique physical and chemical properties of the resulting interfaces, which can be further tuned by designing chemical schemes to tether the phthalocyanine moieties by strong covalent bonds. Furthermore, the properties of these interfaces can be tuned and controlled even further by varying the coordinated metalation, thus providing a wide variety of platforms for many applications, including catalysis and sensing. In this work, an efficient wet chemistry method is developed to achieve the covalent attachment of phthalocyanine molecules directly to a chlorine terminated Si(111) surface without any additional linkers or functional groups. The possibility of cobalt metalation of this modified surface is also tested. X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and atomic-force microscopy (AFM) are utilized to study the phthalocyanine attachment and metalation processes. The theoretical predictions of core-level N 1s binding energies are investigated by density functional theory (DFT) calculations to compare with experimental results obtained by XPS and to infer the possible mechanisms of surface reactions.