The covalent attachment of dye molecules to metal and semiconductor surfaces has attracted substantial attention due to the versatile optical and electronic properties that can be introduced by this functionalization. Furthermore, the physical and chemical properties of the resulting interfaces can be tuned and controlled by the metalation of dye molecule-functionalized surfaces. This approach may also have profound effect on catalysis and sensing applications. In this work, we develop a novel method to covalently attach phthalocyanine molecules directly to a chlorine terminated Si(111) surface without any additional linkers or functional groups and the possibility of cobalt metalation of this surface is also tested. The chemical nature and surface topography of the resulting phthalocyanine-modified Si(111) surfaces are characterized by X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and atomic-force microscopy (AFM). Density functional theory (DFT) calculations are performed to predict core-level N 1s binding energies to compare with experimental results obtained by XPS, to infer the mechanisms of surface reactions, and to interrogate the stability of the surface species formed.

Covalent attachment of phthalocyanine and cobalt metalation on chlorine terminated Si(111) surface

254th National Meeting (2017)

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