title: Mechanical properties of organic nanofibers.
abstract: Intrinsic elastic and inelastic mechanical properties of individual, self-assembled, quasi-single-crystalline para-hexaphenylene nanofibers supported on substrates with different hydrophobicities are investigated as well as the interplay between the fibers and the underlying substrates. We find from atomic-force-microscopy-based rupture experiments a rupture shear stress of about 2 x 10(7) Pa for an individual fiber. Deflecting a nanofiber suspended across a gap results in a Young's modulus of 0.65 GPa. Translational motion of intact nanofibers across the surface is demonstrated for fibers on a silicon substrate with a low-adhesion coating, whereas such motion on a noncoated substrate is limited to very short (sub-micrometer) nanofiber pieces due to strong adhesive forces.
authors.affiliation: MIC-Department of Micro and Nanotechnology, Technical University of Denmark, Building 345 east, 2800 Kgs. Lyngby, Denmark. jkh@mic.dtu.dk
authors.forename: Jakob
authors.initials: J
authors.lastname: Kjelstrup-Hansen
authors.forename: Ole
authors.initials: O
authors.lastname: Hansen
authors.forename: Horst-Günter
authors.initials: HG
authors.lastname: Rubahn
authors.forename: Peter
authors.initials: P
authors.lastname: Bøggild
mesh_terms: D000268:Adhesiveness; D004548:Elasticity; D008422:Materials Testing; D019563:Mechanics; D008968:Molecular Conformation; D009038:Motion; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D009930:Organic Chemicals / Q000737:chemistry*; D010316:Particle Size; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D009930:Organic Chemicals