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Thermodynamics and Kinetics Synergetic Phase-Engineering of Chemical Vapor Deposition Grown Single Crystal MoTe2 Nanosheets
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-04-06 00:00:00 , DOI: 10.1021/acs.cgd.7b01624 Xiaosa Xu , Xiaobo Li , Kaiqiang Liu , Jing Li , Qingliang Feng 1 , Lin Zhou 2 , Fangfang Cui , Xing Liang , Zhibin Lei , Zonghuai Liu , Hua Xu
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-04-06 00:00:00 , DOI: 10.1021/acs.cgd.7b01624 Xiaosa Xu , Xiaobo Li , Kaiqiang Liu , Jing Li , Qingliang Feng 1 , Lin Zhou 2 , Fangfang Cui , Xing Liang , Zhibin Lei , Zonghuai Liu , Hua Xu
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Molybdenum ditelluride (MoTe2), which is stabilized in both semiconducting hexagonal (2H) and metallic distorted octahedral (1T’) phases, has attracted increasing attention owing to their attractive properties for promising wide applications. Exploring the full potential of this emerging material requires a reliable synthesis approach to precisely control its phase structure. Here, we report on the growth of high crystallinity MoTe2 nanosheets with a controlled phase via the tellurization of chemical vapor deposition-grown MoO2 nanosheets. The single crystal MoO2 nanosheets with rhombus shape were converted into MoTe2 single crystal nanosheets with morphology maintained well through the tellurization process. The phase structure of as-grown MoTe2 is determined by the synergetic effect of thermodynamics and kinetics in the crystal growth process, which is based on the difference in the thermodynamic stability and the lattice strain between 2H and 1T’ phases. Low growth temperature combined with a slow tellurization rate (low Te content) is favorable for growing 2H-MoTe2, while high growth temperature together with a fast tellurization rate (high Te content) is beneficial to grow 1T’-MoTe2. A phase diagram based on the thermodynamics and kinetics of MoTe2 growth was drawn, which provides significant guidance for future synthesizing of two-dimensional materials with a controlled phase structure.
中文翻译：
化学气相沉积生长的单晶MoTe 2纳米片的热力学和动力学协同相工程。
在半导体六角形（2H）和金属扭曲的八面体（1T'）相中都稳定的二碲化钼（MoTe 2）由于具有诱人的性能而有望被广泛应用而受到越来越多的关注。挖掘这种新兴材料的全部潜力，需要一种可靠的合成方法来精确控制其相结构。在这里，我们通过化学气相沉积生长的MoO 2纳米片的碲化报告了具有受控相的高结晶度MoTe 2纳米片的生长。将具有菱形形状的单晶MoO 2纳米片转化为MoTe 2在碲化过程中，具有良好形态的单晶纳米片保持良好状态。MoTe 2生长的相结构是由晶体生长过程中热力学和动力学的协同效应决定的，这是基于2H和1T'相之间的热力学稳定性和晶格应变的差异。低生长温度与缓慢的碲化速率（低Te含量）结合在一起有利于2H-MoTe 2的生长，而高生长温度与快速的碲化速率（高Te含量）结合则有利于1T'-MoTe 2的生长。基于MoTe 2的热力学和动力学的相图 绘制了生长曲线，这为将来合成具有受控相结构的二维材料提供了重要指导。
更新日期：2018-04-06
中文翻译：
化学气相沉积生长的单晶MoTe 2纳米片的热力学和动力学协同相工程。
在半导体六角形（2H）和金属扭曲的八面体（1T'）相中都稳定的二碲化钼（MoTe 2）由于具有诱人的性能而有望被广泛应用而受到越来越多的关注。挖掘这种新兴材料的全部潜力，需要一种可靠的合成方法来精确控制其相结构。在这里，我们通过化学气相沉积生长的MoO 2纳米片的碲化报告了具有受控相的高结晶度MoTe 2纳米片的生长。将具有菱形形状的单晶MoO 2纳米片转化为MoTe 2在碲化过程中，具有良好形态的单晶纳米片保持良好状态。MoTe 2生长的相结构是由晶体生长过程中热力学和动力学的协同效应决定的，这是基于2H和1T'相之间的热力学稳定性和晶格应变的差异。低生长温度与缓慢的碲化速率（低Te含量）结合在一起有利于2H-MoTe 2的生长，而高生长温度与快速的碲化速率（高Te含量）结合则有利于1T'-MoTe 2的生长。基于MoTe 2的热力学和动力学的相图 绘制了生长曲线，这为将来合成具有受控相结构的二维材料提供了重要指导。
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