Tuning Anisotropic Optical Properties of Inorganic and Hybrid Organic-Inorganic MXenes via Topochemical Surface Modification

We are grateful to Dr. Andrew Nelson for critical reading and editing of the manuscript. H.F. and Z.F. thank Adam Alfieri and Jason Lynch from Prof. Deep Jariwala's group at the University of Pennsylvania for the help with ellipsometry data conversion from Accurion EP4 to CompleteEase. This work was supported by funding from the U.S. National Science Foundation under Grant Number CHE-2318105 (M-STAR CCI). Y.-H.K. acknowledges support from the U.S. National Science Foundation Research Traineeship Program under Grant No. 2022023 and the DB Dream Master Fellowship. Z.F. and H.F. acknowledge additional support from the U.S. National Science Foundation Grant CMMI-2134607. Solid-state NMR spectroscopy studies of MXenes (A.R.M.S. and A.J.R.) were supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. NMR experiments were performed at Ames National Laboratory, which is operated for the U.S. DOE by Iowa State University under contract DE-AC02-07CH11358. A.C, G.A and F.L acknowledge financial support from Washington University in St. Louis and the Institute of Materials Science & Engineering for the use of equipment and staff assistance. H.F. acknowledges postdoctoral fellowship support from the School of Arts and Sciences at the University of Pennsylvania.