Selective Etching of Silicon from Ti₃SiC₂ (MAX) To Obtain 2D Titanium Carbide (MXene)

Until now, MXenes could only be produced from MAX phases containing aluminum, such as Ti₃ AlC₂ . Here, we report on the synthesis of Ti₃ C₂ (MXene) through selective etching of silicon from titanium silicon carbide-the most common MAX phase. Liters of colloidal solutions of delaminated Ti₃ SiC₂ -derived MXene (0.5-1.3 mg mL^-1 ) were produced and processed into flexible and electrically conductive films, which show higher oxidation resistance than MXene synthesized from Ti₃ AlC₂ . This new synthesis method greatly widens the range of precursors for MXene synthesis.