CEITEC Nano User Meeting – 1st December 2016

CEITEC Nano Research Infrastructure (buildings C+S)
Purkyňova 123, 612 00 Brno

Final programme:

Registration - Hallway Building "C"
Conference Room - Building "S"
Opening word
Invited lectures

Coffee break
Panel discussion + user comittee election Conference Room - Building "S"
Lunch bufet - Building "C, 1st Floor"
Lab tours & demonstrations - Building "C, 2nd Floor"
Poster session - Building "C, 1st Floor"
Best poster & Best image Award ceremony - Building "C, 1st Floor"
Banquet - Building "C, 1st Floor"

Registration is closed!

If you want us to print your poster send a .pdf file to nano@ceitec.vutbr.cz until November 28.

Best micrograph award - send your image (one image per registered participant) in .png or .jpg format to nano@ceitec.vutbr.cz until November 28.

We look forward to meet you!

Invited lectures

Auger Electron Microscopy at CEITEC Nano

Miroslav Kolíbal, CEITEC Brno University of Technology

In my contribution, I will introduce nanoSAM instrument located at CEITEC Nano. I will give a brief overview of Auger Spectroscopy, with special emphasis on microscopy-related features, followed by several examples of experimental work on two- and one-dimensional material systems conducted in collaboration with different research groups around the world.

Model catalytic oxide systems: from clusters to single atoms

Zbyněk Novotný, Pacific Northwest National Laboratory, Richland, USA

Well-defined model catalytic systems prepared under ultra-high vacuum conditions can be studied with great control. Such model systems span a broad range of complexities ranging from adsorbates on single crystalline surfaces to supported clusters of metals and oxides. In my talk I will present three examples of studies from my graduate and postdoctoral work using high-resolution scanning tunneling microscopy as the primary tool.
First, I will demonstrate the unique adsorption properties of the magnetite, Fe3O4(001)-(√2×√2) surface, and its ability to stabilize single metal atoms at temperatures as high as 700 K. The properties of single atoms of Au, and the adsorbate-induced sintering of single Pd atoms will be discussed. The second part of this presentation will center on ceria nanoclusters supported on single layer graphene on Ru(0001). We studied growth, oxidation, and reduction of these clusters at elevated temperatures with a focus on oxygen transport. These studies revealed that easily reducible CeOx clusters act as intercalation gateways capable of efficiently delivering oxygen underneath the graphene layer. Finally, ongoing work on chemical functionalization of supported graphene on Ru(0001) with atomic oxygen will be presented. Using high-resolution imaging at elevated temperatures (425-500 K), we were able to assign the adsorption configuration of atomic oxygen to the on-top bonded enolate group rather than the expected bridge-bonded epoxy and follow its diffusion. The high thermal stability of enolate groups (immobile up to 400 K), and their large periodic separation (~3 nm) makes functionalized graphene/Ru(0001) an ideal model system for studies of monodispersed catalysts, possibly including single metal centers.

               ​​​                ​