Abstract
Ti3C2Tx belongs to the family of MXenes, 2D materials with an attractive combination of functional properties suitable for applications such as batteries, supercapacitors, and strain sensors. However, the fabrication of devices and functional coatings based on Ti3C2Tx remains challenging as they are prone to chemical degradation by their oxidation to TiO2. In this paper, we examine the oxidation of Ti3C2Tx in air, liquid, and solid media via conductivity measurements to assess the shelf life of Ti3C2Tx MXenes. The oxidation of Ti3C2Tx was observed in all the media used in this study, but it is fastest in liquid media and slowest in solid media (including polymer matrices). We also show that the conventional indicators of MXene oxidation, such as changes in color and colloidal stability, are not always reliable. Finally, we demonstrate the acceleration of oxidation under exposure to UV light.
Highlights
MXenes are 2D materials consisting of M, X, and T
The Ti3C2Tx powder was intercalated with dimethyl sulfoxide (DMSO) and solvent exchanged to water
The results are in npj 2D Materials and Applications (2019) 8
Summary
MXenes are 2D materials consisting of M (early transitional metal),X (carbon or nitrogen), and T (terminal groups). 1234567890():,; Fig. 1 An overview of the experimental procedure: after the synthesis of Ti3C2Tx MXene nanosheets from parent MAX phases, the samples were dispersed in various media and solid (ice and polymer) media to understand how storage and/or dispersion media influence Ti3C2Tx oxidation processes.
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