dc.contributor.advisor | Baykara, Mehmet Zeyyad | |
dc.contributor.author | Cihan, Ebru | |
dc.date.accessioned | 2016-07-01T11:11:02Z | |
dc.date.available | 2016-07-01T11:11:02Z | |
dc.date.issued | 2015 | |
dc.identifier.uri | http://hdl.handle.net/11693/30036 | |
dc.description | Cataloged from PDF version of article. | en_US |
dc.description.abstract | Forming a complete understanding of the physical mechanisms that govern friction
on the nanometer and atomic scales is an ongoing endeavor for scientists from
various disciplines. While atomic force microscopy (AFM) has proven to be
invaluable for the detailed study of nano-scale frictional properties associated with
various surfaces, issues related to the precise characterization of the contact formed
by the probe tip and the sample surface remain largely unsolved.
In recent years, an alternative approach to nanotribology experiments has involved
the lateral manipulation of well-characterized nanoparticles on sample surfaces via
AFM and the measurement of associated frictional forces. In line with this idea,
ambient-condition structural/nanotribological characterization and
nano-manipulation experiments involving gold nanoparticles (AuNP) thermally
deposited on highly oriented pyrolytic graphite (HOPG) are presented in this thesis.
The effect of deposition amount on thin film morphology is discussed and post-
deposition annealing procedure in terms of different annealing temperatures and
times are tackled in order to characterize AuNP formation on HOPG. The
morphology and distribution of AuNPs on HOPG are studied via scanning electron
microscopy (SEM) while the confirmation of AuNP crystallinity via transmission
electron microscopy (TEM) is also described. Topographical characterization of
the resulting AuNP/HOPG material system performed via contact-mode AFM is
demonstrated. Lateral force measurements are also presented, in terms of the
dependence of friction force on normal load as well as the dependence of friction
force increase at AuNP edges on normal load and particle height. Subsequent to
comprehensive structural and frictional characterization, the results of
nano-manipulation experiments performed on AuNPs on the HOPG substrate are
reported and it is observed that AuNPs experience remarkably low frictional forces
during sliding. A detailed study of friction with respect to contact area firmly
confirms the occurrence of structurally lubric sliding under ambient conditions for
this material system. This result constitutes the first observation of structurally
lubric sliding under ambient conditions between different materials in the scientific
literature. | en_US |
dc.description.statementofresponsibility | Cihan, Ebru | en_US |
dc.format.extent | xvii, 84 leaves, Charts | en_US |
dc.language.iso | English | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | Atomic force microscopy | en_US |
dc.subject | Friction force microscopy | en_US |
dc.subject | Friction | en_US |
dc.subject | Nanotribology | en_US |
dc.subject | Nanoparticle | en_US |
dc.subject | Superlubricity | en_US |
dc.subject | Structural lubricity | en_US |
dc.subject.lcc | B150953 | en_US |
dc.title | Structure and nanotribology of thermally deposited gold nanoparticles on graphite | en_US |
dc.type | Thesis | en_US |
dc.department | Graduate Program in Materials Science and Nanotechnology | en_US |
dc.publisher | Bilkent University | en_US |
dc.description.degree | M.S. | en_US |
dc.identifier.itemid | B150953 | |