Chemical Vapor Deposition of 2D Vanadium Disulfide and Diselenide and Raman Characterization of the Phase Transitions
Chemical Vapor Deposition of 2D Vanadium Disulfide and Diselenide and Raman Characterization of the Phase Transitions
复制标题
二维二硫化钒和二硒化物的化学气相沉积以及相变的拉曼表征
DOI：
10.1002/admi.201800528
复制
发表时间：
2018-08-23
影响因子：
5.4
通讯作者：
Xie, Liming
中科院分区：
文献类型：
--
作者：
Hossain, Mongur;Wu, Juanxia;Xie, Liming
二维金属二硫化物钒（VX2）由于其独特的物理性质和作为高性能功能纳米材料的潜在应用而重新引起人们的兴趣。本文对二维金属VX2的合成和相变进行了研究。以六方氮化硼和云母为底物，采用化学气相沉积法合成。制备了厚度在10nm以下的高质量VX2薄片，并用透射电镜对其进行了表征。在330 ~ 5 K之间进行了温度相关的拉曼表征，发现VS2片在150 K左右和VSe2片在110 K左右的拉曼模式发生了显著变化，表明电荷密度波相变。温度相关的电测量也支持拉曼表征中观察到的相变。
2D metallic vanadium dichalcogenides (VX2) have renewed interest due to their unique physical properties and potential applications as high-performance functional nanomaterials. Herein, the synthesis and phase transitions of 2D metallic VX2 are investigated. The synthesis is done by chemical vapor deposition using hexagonal boron nitride and mica as substrates. High-quality VX2 flakes with sub-10 nm thickness are obtained and characterized by transmission electron microscopy. Temperature-dependent Raman characterization between 330 and 5 K is conducted and remarkable changes of Raman modes at around 150 K for VS2 flakes and 110 K for VSe2 flakes are revealed, indicating charge density wave phase transitions. Temperature-dependent electrical measurements have also supported the phase transitions observed in Raman characterization.