The BNC Faculty Seminar Series is designed to provide faculty a platform to present an overview of their research and the opportunity for collaborative discussion with other BNC faculty and researchers across six colleges and 15 academic units.

Dmitry Zemlyanov

Senior Research Scientist - Surface Science Application, Birck Nanotechnology Center

January 28^th, 2021 | 12:00pm

Join Zoom: https://purdue-edu.zoom.us/j/91754078808

Title: Growth and in-situ characterization of 2D materials

Abstract: 2D materials and nano-materials often exhibit unique electronic, mechanical and thermal properties, which cannot be found in their bulk forms. Surface nature makes these materials prone to contaminations. Therefore, in-situ growth and characterization of 2D materials is crucial step for fundamental property understanding, smart material design, functionalization, fabrication, etc. The Surface Analysis Facility at Birck Nanotechnology Center, Purdue University, is equipped with state-of-art characterization tools such as X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy/spectroscopy (STM), high–resolution electron energy loss spectroscopy (HREELS), low energy electron diffraction (LEED). These techniques are combined with synthesis capabilities (PVD, CMD and vacuum ALD) creating exceptional opportunities for researchers in the area of 2D and nano-materials.

In this talk, I would like to demonstrated a few examples of synthesis and in-situ characterization of 2D materials. For instance, Pd and Pt tellurides and selenides are Dirac semimetals demonstrating fascinating quantum phenomena such as superconductivity, magnetism, topological order and excitation of surface plasmons. Due to the strong interlayer coupling and electron level hybridization, it is extremely challenging to prepare large-area monolayer of PdTe₂ and PtTe₂. We developed a simple method of epitaxial growth of PdTe₂ and PtTe₂ by direct tellurization of platinum and palladium surfaces, which allowed us to synthesize large-area and high-quality monolayer films of these two materials. As another examples, I would like to demonstrated nanomanipulation of MoTe₂ and MoS₂ and interaction of metal with oxide support. The strong metal support interaction (SMSI) is among the best-known classes of oxide-metal interfacial interactions in heterogeneous catalysis, but there is limited insight in the atomic-scale understanding of the structure and phase of the SMSI oxide. We have investigated interfacial interaction between ZnOx oxide and Pd metal under varying gas phase conditions. Structural transformations from bilayer to monolayer and then PdZn alloy confirmed that zinc oxide as a non-reducible oxide, can spread on metal surface and show an SMSI-like behavior in the presence of hydrogen.

Bio: Dmitry Zemlyanov received his Ph.D. in Physics and Mathematics from the Novosibirsk State University, Russia, in 1995. He is currently a Senior Research Scientist - Surface Science Application at Birck Nanotechnology Center, Purdue University. He held research and teaching positions in premier scientific organizations in Russia, Ireland and Germany prior to joining Purdue and published over 165 journal papers in the areas of surface science, catalysis and materials science. At Purdue, he collaborates with a wide variety of research groups from College of Science and College of Engineering enabling them to develop and apply advanced scientific instrumentation in the area of surface characterization.

Upcoming BNC Virtual Faculty Seminars, Spring 2021:

Date	Faculty	Title
1/28/20	Dmitry Zemlyanov, Senior Research Scientist - Surface Science Application, Birck Nanotechnology Center	Growth and characterization of 2D materials
2/4/21	Yi Xie, Assistant Professor, School of Nuclear Engineering	Degradation of Structural Materials and Fuels in Nuclear Systems
2/11/21	Letian Dou, Assistant Professor, Davidson School of Chemical Engineering	Organic-Perovskite Hybrid Quantum Wells, Heterostructure, and Optoelectronics
2/18/21	Nikhilesh Chawla, Ransburg Professor, School of Materials Engineering	4D Materials Science – Probing Microstructural Evolution Through Time-Resolved Imaging
2/25/21	Sorin Adam Matei, Associate Dean of Research and Graduate Education, College of Liberal Arts, Professor of Communication, Brian Lamb School of Communication	Team Science – what it is, how it works, and why it does not always work the way we want it to work
3/4/21	David Cappelleri, Associate Professor of Mechanical Engineering	Microrobotics Research Highlights
3/11/21	Stylianos Chatzidakis, Assistant Professor, School of Nuclear Engineering
3/18/21	Reading Day
3/25/21	Tyler Tallman, Assistant Professor, School of Aeronautics and Astronautics
4/1/21	Alex Chortos, Assistant Professor, Mechanical Engineering
4/8/21	Ajay Malshe, R. Eugene and Susie E. Goodson Distinguished Professor of Mechanical Engineering
4/15/21	Suranjan Panigrahi, Professor Electrical and Computer Engineering Technology
4/22/21	Alejandro Strachan, Professor of Materials Engineering
4/29/21	Dead Week
5/6/21	Finals Week

Thanks!

Jaime Turner
Lead Administrative Assistant to the Director | Birck Nanotechnology Center

BRK | 1205 W State Street | West Lafayette, IN 47907

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