Ultrabroadband Optical Properties of 2D Titanium Carbide MXene

• DOI: 10.1021/acsami.4c12079
• Publication Date: 2024-10-22T16:56:41Z
• Authors: Sean L. Murray; Sahand Serajian; Syed Ibrahim Gnan...; Shiseido Robinson; Rajavel Krishnamo...; Suprem R. Das; Mona Bavarian; Siamak Nejati; Ufuk Kilic; Mathias Schubert; Mohammad Ghashami
• Keywords: MXenes; Ultraviolet; Titanium carbide; Optical conductivity

MXenes have rapidly ascended as a prominent class of two-dimensional (2D) materials, renowned for their distinctive optical and electrical properties. Despite extensive exploration MXenes' properties, existing studies predominantly focus on the near-infrared (NIR) to ultraviolet spectral range, leaving mid-infrared (mid-IR) range relatively uncharted. In this study, we conducted comprehensive characterization intrinsic properties Ti3C2Tx MXene across an ultrabroadband spanning from mid-IR (28 meV) vacuum (VUV, 6.4 eV). For purpose, films varying thicknesses were coated quartz substrates, resulting in two distinct categories: thin film samples with below 50 nm bulk-like exceeding 500 nm. Using spectroscopic ellipsometry, analyzed various extracted detailed information dielectric functions. Our findings reveal resonances VUV range. Employing Lorentz–Drude model examine these has uncovered resistivity led identification multiple plasmonic modes active visible NIR well broad band-to-band transition-like This versatility is anticipated bring about wide thermal applications.