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2D Transition Metal Carbides and Nitrides (MXenes): Interplay of Chemistry, Physics, and Applications

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Thursday, April 14, 2022 4 pm

This is a past event.

ME-EM Graduate Seminar Speaker Series

proudly presents

Vadym Mochalin, PhD

Missouri University of Science & Technology

Abstract

A large family of two-dimensional transition metal carbides and nitrides (MXenes) raises interest for many applications due to their high electrical conductivity, mechanical properties, tunable electronic structure, nonlinear optical properties, and the ability to be manufactured in the thin film state. However, their chemistry that is key to development of these applications, still remains largely terra incognita. In this talk I will discuss recent progress in understanding fundamental MXene chemistry and harnessing it for development of applications.

For example, during delamination and storage in ambient air environment, spontaneous oxidation of MXene flakes leads to formation of titanium oxide, a process that can be harnessed for simple, inexpensive, and environmentally benign manufacturing MXene–titania composites for optoelectronics, sensing, and other applications. We show that partially oxidized MXene thin films containing the in situ formed phase of titanium oxide have a significant photoresponse in the UV region of the spectrum. The relaxation process of photoexcited charge carriers, which takes a long time (~24 h), can be accelerated in the presence of oxygen and water vapor in the atmosphere. These properties of spontaneously formed MXene-titania thin films make them attractive materials for photoresistors with memory effect and sensitivity to the environment, as well as many other photo- and environment-sensing applications.

Bio

Dr. Vadym Mochalin has received PhD.in Physical Chemistry from L. M. Litvinenko Institute of Physical Organic and Coal Chemistry, National Academy of Sciences of Ukraine and MS in Biochemistry (cum laude) from Donetsk National University, Ukraine. He is now Associate Professor in Chemistry at Missouri University of Science & Technology with joint appointment in the Department of Materials Science & Engineering. His current research interests include fundamental chemistry, synthesis, characterization, purification, chemical modification, modeling, and developing applications of nanodiamond, MXene, nanoonions, nanocarbons, and other nanomaterials for composites, energy storage, biomedical applications, and extreme environments. Dr. Mochalin has co-authored over 90 research papers in peer reviewed journals, has been invited to write several book chapters and review articles and is an inventor on 7 international patents. He serves on the Editorial Board of Scientific Reports – a Nature Research journal. Since 2021 Dr. Mochalin serves as editor of Diamond and Related Materials (Elsevier).

Invited by: Parisa Abadi

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  • Mojtaba Rostami

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