Jalouli Alireza, Kilinc Muhammed, Marga Austin, Bian Mengying, Thomay Tim, Petrou Athos, Zeng Hao
Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA.
J Chem Phys. 2022 Apr 7;156(13):134704. doi: 10.1063/5.0081929.
In this work, a chemical vapor deposition (CVD) method was developed for the synthesis of transition metal dichalcogenide alloy monolayers, with a composition gradient in the radial direction. The composition gradient was achieved by controlling the substrate cooling rate during the CVD growth. The two types of alloys, namely, WSSe and MoSSe, were found to exhibit an opposite composition gradient. This is attributed to their different cohesive energies. A two-dimensional Ising model is used to explain the growth mechanism, where two ends of the composition were modeled as a magnetically ordered phase and a paramagnetic phase. The composition as a function of substrate temperature is then represented by the thermal magnetization curve.
