Seminarium Fizyki Ciała Stałego
sala 0.06, ul. Pasteura 5
2020-06-19 (10:15) 
Robert Szoszkiewicz PhD, Habil., Assoc. Prof. of Physical Chemistry (Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland.)
Kinetics of oxidative etching and Mo oxides produced during oxidation of single microscale 2H MoS2 flakes in air and high relative humidity
For numerous applications of microscopic MoS2 crystals one must understand their most expected surface reactions. Ubiquitous examples of these are oxidation reactions in air and water. In this seminar, we show how we studied the kinetics of microscopic heat-induced oxidative etching in the case of thick, mechanically exfoliated, geological MoS2 crystals in air. Next, based on the literature we discuss particular reaction mechanisms of oxidative etching as well as mention other competitive processes. In the second part of the seminar, we show how to differentiate MoO3 oxides and their derivatives on thermally oxidized microscopic 2H MoS2 flakes. In order to do so, we combined XPS and AFM measurements such as topography, friction, creation of nanoscale ripples and scratches on the MoS2 flakes.References:1. U. Ukegbu, R. Szoszkiewicz, J. Phys. Chem. C, 2019.2. R. Szoszkiewicz, M. Rogala, P. Dąbrowski, submitted, 2020.UwagaSeminarium w trybie zdalnympatrz instrukcja :instrukcja: (pdf file)AttentionThe seminar in the remote modesee instruction :instruction: (pdf file)