EventDr. Damien Voiry

2D Transition Metal Dichalcogenides Nanosheets for Molecular Sieving and Electrocatalysis

Exfoliated Transition metal dichalcogenides (TMDs) nanosheets are intensively investigated for opto-electronic and electro-catalytic applications1,2. The properties of TMDs can be largely tuned by changing their elemental composition, their thickness and their atomic structure1. Besides phase engineering, the properties of 2D materials can be tuned by changing the defect concentration such as sulfur vacancies. In addition, we have recently demonstrated that TMD nanosheets can be covalently functionalized (Figure 1) which opens new avenues for controlling the surface chemistry and the opto-electronic properties of exfoliated TMDs3. Nanolaminate membranes made of two-dimensional materials (2D) such as graphene oxide (GO) are also promising candidates for molecular sieving via size-limited diffusion in the 2D capillaries4. Controlling the surface chemistry of the 2D nanosheets can provide additional tools for enhancing the sieving performance of the nanolaminate membranes. Through several examples, I will present our recent strategies for engineering exfoliated nanosheets of TMDs. My presentation will highlight how these strategies can be used for fine tuning the properties of the 2D TMDs and other 2D materials for molecular sieving and electrocatalysis

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Figure 1: Cross section view of a covalently functionalized TMD nanosheet

About The Speaker

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Damien Voiry received his B. Eng degree in Materials Science from the Graduate School of  Chemistry and Physics of Bordeaux, France in 2007. He obtained his PhD in Materials Science and Engineering from the Center Paul Pascal, University of Bordeaux in 2010 under the supervision of Dr. Alain Pénicaud. His PhD focused on the dissolution and covalent functionalization of carbon nanotubes. In 2011, he joined the group of Professor Chhowalla as postdoctoral associate to work on exfoliated 2D materials. Since February 2016, he is a CNRS researcher at the European Institute of Membranes (IEM, UMR5635) in Montpellier and was awarded the European ERC-Starting Grant in July 2018. His research deals with the engineering of 2D materials for developing novel membranes and electrocatalysis.