Abstracts (plenary speakers)

 


Optical and Electronic Properties of 2D Transition Metal Carbides and Nitrides (MXenes)

Prof. Yury Gogotsi
A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA

Abstract:

2D transition metal carbides and nitrides (MXenes) are a large and quickly growing family of 2D materials with more than 30 compositions experimentally synthesized and dozens more predicted to be stable and studied computationally. In addition to about a 100 of well-defined stoichiometric compositions, an infinite number of solid solutions is possible.1 They benefit from their high electrical conductivity (most of them are metallic conductors), wide range of optical properties, tunable plasmon resonance, hydrophilic surface, and high mechanical strength. Because of those properties, they show promise in a wide a variety of applications from energy storage to electromagnetic interference shielding, transparent conducting coatings, solar cells, photonics and plasmonic. In this talk, an overview of fundamental electronic and optical properties of MXenes will be presented and discussed. Specifically, the roles of intra- and inter-flake electronic conduction on the temperature-dependence of resistivity of MXenes will be discussed in detail. Moreover, systematic investigation of the roles of MXene composition, including the transition metals (e.g., Ti3C2 vs Mo2TiC2), the X elements (C and/or N), and surface terminations on their optical, electronic and transport properties will be presented.

  1. Anasori, Y. Gogotsi (Ed.) 2D Metal Carbides and Nitrides (MXenes): Structure, Properties and Applications, Springer, 2019

Nanobioelectrocatalysis for Energy and Environmental Applications

Prof. Shelley Minteer

Abstract:

Oxidoreductase enzymes have been employed for almost 5 decades in biosensors and for energy conversion in the form of biofuel cells. However, most enzymatic bioelectrodes in the literature utilize complex biofuels (e.g. glucose), but only partially oxidize the complex biofuel via the use of a single enzyme (i.e. glucose oxidase or glucose dehydrogenase). This presentation will detail the use of enzyme cascades on nanostructured conductive materials at bioanodes for deep to complete oxidation of substrates to improve performance (current density and power density of electrochemical devices), but will also focus on the importance of designing and forming nanostructured supercomplexes (metabolons) for inducing substrate channeling between catalytic active sites in multi-enzyme cascades. These enzyme cascades will include naturally-designed nanostructured supercomplexes (i.e. the Kreb’s cycle) and engineered nanostructured metabolons utilizing DNA origami as a nanostructured scaffold. It will ┬ádiscuss the importance of structural orientation of hierarchical nanostructures in enzymatic cascades for efficient bioelectrocatalysis. Finally, the talk will discuss the energy and environmental applications that can be addressed by these new nanostructured bioelectrodes.