Electrostatic Force Microscopy of Self Assembled Peptide Structures

Casper Hyttel Clausen, Maria Dimaki, Spyros P. Pantagos, Emmanouil Kasotakis, Anna Mitrakli, Winnie Edith Svendsen, Jaime Castillo

    Research output: Contribution to journalJournal articleResearchpeer-review


    In this report electrostatic force microscopy (EFM) is used to study different peptide self-assembled structures, such as tubes and particles. It is shown that not only geometrical information can be obtained using EFM, but also information about the composition of different structures. In particular we use EFM to investigate the structures of diphenylalanine peptide tubes, particles, and CSGAITIG peptide particles placed on pre-fabricated SiO2 surfaces with a backgate. We show that the cavity in the peptide tubes could be to the presence of water residues. Additionally we show that self-assembled amyloid peptides form spherical solid structures containing the same self-assembled peptide in its interior. In both cases transmission electron microscopy is used to verify these structures. Further, the limitations of the EFM technique are discussed, especially when the observed structures become small compared to the radius of the AFM tip used. Finally, an agreement between the detected signal and the structure of the hollow peptide tubes is demonstrated.
    Original languageEnglish
    Issue number4
    Pages (from-to)201-207
    Publication statusPublished - 2011


    • Self-assembly
    • Electrostatic force microscopy
    • Peptide nanoparticles
    • Peptide nanotubes


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