Abdoulaye Djire4,Sarah King1,Joseph Spellberg1,Janek Rieger1,Calvin Raab1,Francisco Lagunas2,Robert Klie2,Di Wang1,Dmitri Talapin1,Jordan Hachtel3
University of Chicago1,University of Illinois at Chicago2,Oak Ridge National Laboratory3,Texas A&M University4
Abdoulaye Djire4,Sarah King1,Joseph Spellberg1,Janek Rieger1,Calvin Raab1,Francisco Lagunas2,Robert Klie2,Di Wang1,Dmitri Talapin1,Jordan Hachtel3
University of Chicago1,University of Illinois at Chicago2,Oak Ridge National Laboratory3,Texas A&M University4
Despite their tremendous potential as plasmonic materials because of their 2D metallic properties, very little is known about the fundamental plasmonic resonances of MXenes. This is primarily due to irregularity in plasmonic responses from mixed surface terminations and varying material shape and thickness. In this talk I will discuss experimental methods we are using in my group to probe the nanoscale plasmonic response of MXenes, both traditional mixed-terminated Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> as well as singly terminated Mxenes synthesized by both CVD and molten salt synthesis, Ti<sub>2</sub>CCl<sub>2</sub> and Ti<sub>3</sub>C<sub>2</sub>Cl<sub>2</sub>. Leveraging the time-resolution and spatial-resolution of time-resolved photoemission electron microscopy we are investigating the evolution of plasmonic fields in MXenes in space and time. Using the (MAC)-STEM/EELS facility at ORNL we can directly image energy-resolved plasmonic resonances of MXenes, where we find that surface oxidation substantially decreases the plasmonic response of Ti<sub>3</sub>C<sub>2</sub>Cl<sub>2</sub>. Together our experiments highlight the variation in nanoscale plasmonic properties of MXenes and opportunities for control.