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Study of metal surfaces in operando conditions by means of near-ambient-pressure scanning tunneling microscopy
 Dlabaja, Petr ; Matvija, Peter (advisor) ; Kocán, Pavel (referee)
Title: Study of metal surfaces in operando conditions by means of near-ambient- pressure scanning tunneling microscopy Author: Petr Dlabaja Department: Department of Surface and Plasma Science Supervisor: RNDr. Peter Matvija, Ph.D., Department of Surface and Plasma Science Abstract: The thesis covers investigation of monocrystalline surfaces of metals Cu(111) and Pt(111) in high pressures. These surfaces were exposed to oxygen and carbon monoxide gasses of pressures between 1 × 10−10 mbar and 5 mbar. Changes in the structure of the surfaces was monitored using scanning tunneling microscopy, low-energy electron diffraction and X-ray photoelectron spectroscopy. Acquired results showed that reactive gasses at pressures ≈ 5 mbar affect the structure of the surfaces more prominently than the same gasses of lower pres- sures. The surface of Cu(111) at room temperature and 5 mbar pressure of O2 strongly oxidized. The surface of Pt(111) at pressure 5 mbar of gass O2 oxidized only locally, under the influence of the STM tip. Increased pressure of carbon mo- noxide induces creation of nanometric clusters on the surface of Cu(111), which agglomerate into small islands. These islands are distributed evenly on the whole surface of Cu(111). In contrast increased pressure of carbon monoxide mainly changes the shapes of...
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