Abstract
Self-assembled monolayers (SAMs) of single-stranded peptide nucleic acid (ssPNA) molecules on gold surfaces, with efficient capability for recognizing complementary ssDNA. In spite of their remarkably long length of 6–7 nm, ssPNA molecules can assemble standing-up on the surface similarly to the SAMs of short alkanethiols. The equilibrium between lying and standing-up molecules on the surface is a function of the molecular coverage. These structural and functional studies have been performed by means of powerful label-free techniques for surface characterization such as synchrotron radiation-based X-ray photoemission spectroscopy and atomic force microscopy.
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