Authors:

Madison E Lisenko

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About Paper:

Since their discovery in 2011, MXenes have emerged as a leader in two- dimensional materials for energy storage, electronics, and biomedical applications. Their synthesis traditionally begins with the formation of the MAX precursor from elemental powders. Using a top-down approach, this phase is processed via selective etching and delamination to create a few- to single-flake colloidal solutions. MXenes can form various layered crystalline structures, following the equation MnXn-1Tx, of which n = 3, 4 are observed in this study. As of 2015, double-transition metal (DTM) MXenes were reported and show promise in the field of electrochemistry and as super capacitors. Despite their potential, one major pitfall of MXenes is their susceptibility to oxidation, which decreases their effectiveness over time. This challenge remains relatively unexplored for DTM MXenes and is examined for Mo2TiC2Tx and Mo2TiC3Tx using UV-Vis-NIR here. This spectroscopy method tracks absorbance changes over time in the ultraviolet and visible regions to assess material degradation. Measurements are used alongside Beer Lambert's Law to determine the concentration of each solution. Samples were collected using UV-Vis-NIRS and recorded every 3 days over the course of a 14-day period. Initial results indicate that upon oxidation, the solution exhibits lower absorbance, which is consistent with a decrease in flake concentration in the solution. Further studies, including implementation of organic solvents, can help slow the oxidation processes while following this same analysis process. Keywords: [no keywords provided]

Source:

Purdue University / 2025

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Co-authors:

Madison E Lisenko