Ambient-Stable Two-Dimensional Titanium Carbide (MXene) Enabled by Iodine Etching.

ABSTRACT: MXene (e.g., Ti₃ C₂ ) represents an important class of two-dimensional (2D) materials owing to its unique metallic conductivity and tunable surface chemistry. However, the mainstream synthetic methods rely on the chemical etching of MAX powders (e.g., Ti₃ AlC₂ ) using hazardous HF or alike, leading to MXene sheets with fluorine termination and poor ambient stability in colloidal dispersions. Here, we demonstrate a fluoride-free, iodine (I₂ ) assisted etching route for preparing 2D MXene (Ti₃ C₂ T_x , T=O, OH) with oxygen-rich terminal groups and intact lattice structure. More than 71 % of sheets are thinner than 5 nm with an average size of 1.8 μm. They present excellent thin-film conductivity of 1250 S 

SUBMITTER: Shi H 

PROVIDER: S-EPMC8048443 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature