材料科学
X射线光电子能谱
拉曼光谱
合金
石墨烯
微晶
能量色散X射线光谱学
范德瓦尔斯力
扫描电子显微镜
溅射沉积
剥脱关节
光谱学
扫描透射电子显微镜
溅射
透射电子显微镜
化学工程
纳米技术
薄膜
复合材料
冶金
光学
化学
工程类
物理
量子力学
有机化学
分子
作者
Kōichi Tanaka,Hicham Zaid,Toshihiro Aoki,Aditya Deshpande,Koki Hojo,Cristian V. Ciobanu,Suneel Kodambaka
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-12-26
被引量:1
标识
DOI:10.1021/acs.nanolett.3c04521
摘要
Compositional tunability, an indispensable parameter for modifying the properties of materials, can open up new applications for van der Waals (vdW) layered materials such as transition-metal dichalcogenides (TMDCs). To date, multielement alloy TMDC layers are obtained via exfoliation from bulk polycrystalline powders. Here, we demonstrate direct deposition of high-entropy alloy disulfide, (VNbMoTaW)S2, layers with controllable thicknesses on free-standing graphene membranes and on bare and hBN-covered Al2O3(0001) substrates via ultra-high-vacuum reactive dc magnetron sputtering of the VNbMoTaW target in Kr and H2S gas mixtures. Using a combination of density functional theory calculations, Raman spectroscopy, X-ray diffraction, scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy, we determine that the as-deposited layers are single-phase, 2H-structured, and 0001-oriented (V0.10Nb0.16Mo0.19Ta0.28W0.27)S2.44. Our synthesis route is general and applicable for heteroepitaxial growth of a wide variety of TMDC alloys and potentially other multielement alloy vdW compounds with the desired compositions.
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