X-ray Photoelectron Spectroscopy (XPS), which is known as Electron Spectroscopy for Chemical Analysis (ESCA), is a powerful research tool for the study of the surface of solids. The technique is widely used for studies of the properties of atoms, molecules, solids, and surfaces. The main success of the XPS technique is associated with studies of the physical and chemical phenomena on the surface of solids. These investigations were limited by relatively simple inorganic reactions and not many biologically related objects were approached by XPS. There are impartial reasons for low involvement of XPS into investigations of biologically related objects. In this presentation successful examples of XPS studies of bio-related specimens will be presented. In particular, the systematic XPS investigation of four peptide-silane and peptide- silane hybrid sol-gel thin films prepared under biologically benign conditions will be reported. This work demonstrates a use for XPS to characterized biologically inspired surfaces, providing critical information on peptide coverage on the surface of the materials. The self-assembling layer characterization will be considered on the examples of thiols on Au and aryl diazonium molecules on Si(111).
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