Scientists map the path to a new class of ultra-strong 2D materials
Researchers have identified a chemically stable nanolaminate that could serve as a precursor for manufacturing MXenes—a promising class of two-dimensional materials with applications in energy storage and electronics. The finding, based on computational modeling, removes a major uncertainty blocking commercial development of these advanced materials.
Originaltitel: Phase stability of the nanolaminates V2Ga2C and (Mo1-xVx)(2)Ga2C from first-principles calculations
<p>We here use first-principles calculations to investigate the phase stability of the hypothetical laminated material V2Ga2C and the related alloy (Mo1-xVx)(2)Ga2C, the latter for a potential parent material for synthesis of (Mo1-xVx)(2)C, a new two-dimensional material in the family of so called MXenes. We predict that V2Ga2C is thermodynamically stable with respect to all identified competing phases in the ternary V-Ga-C phase diagram. We further calculate the stability of ordered and disordered configurations of Mo and V in (Mo1-xVx)(2)Ga2C and predict that ordered (Mo1-xVx)(2)Ga2C for x &lt;= 0.25 is stable, with an order-disorder transition temperature of similar to 1000 K. Furthermore, (Mo1-xVx)(2)Ga2C for x = 0.5 and x &gt;= 0.75 is suggested to be stable, but only for disordered Mo-V configurations, and only at elevated temperatures. We have also investigated the electronic and elastic properties of V2Ga2C; the calculated bulk, shear, and Youngs modulus are 141, 94, and 230 GPa, respectively.</p>