title: Synthesis and transport properties of large-scale alloy Co(0.16)Mo(0.84)S2 bilayer nanosheets.
abstract: Synthesis of large-scale highly crystalline two-dimensional alloys is significant for revealing properties. Here, we have investigated the vapor growth process of high-quality bilayer CoxMo1-xS2 (x = 0.16) hexagonal nanosheets systematically. As the initial loading of the sulfur increases, the morphology of the CoxMo1-xS2 (0 < x ≤ 1) nanosheets becomes hexagons from David stars step by step at 680 °C. We find that Co atoms mainly distribute at the edge of nanosheets. When the temperature increases from 680 to 750 °C, high-quality cubic pyrite-type crystal structure CoS2 grows on the surface of CoxMo1-xS2 nanosheet gradually and forms hexagonal film induced by the nanosheet. Electrical transport measurements reveal that the CoxMo1-xS2 nanosheets and CoS2 films exhibit n-type semiconducting transport behavior and half-metallic behavior, respectively. Theoretical calculations of their band structures agree well with the experimental results.
authors.affiliation: Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083, People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.forename: Le
authors.initials: L
authors.lastname: Huang
authors.forename: Mianzeng
authors.initials: M
authors.lastname: Zhong
authors.forename: Nengjie
authors.initials: N
authors.lastname: Huo
authors.forename: Yongtao
authors.initials: Y
authors.lastname: Li
authors.forename: Shengxue
authors.initials: S
authors.lastname: Yang
authors.forename: Chao
authors.initials: C
authors.lastname: Fan
authors.forename: Juehan
authors.initials: J
authors.lastname: Yang
authors.forename: Wenping
authors.initials: W
authors.lastname: Hu
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Wei
authors.forename: Jingbo
authors.initials: J
authors.lastname: Li
keywords: CoxMo1−xS2; band structure; transition-metal dichalcogenides; transport property; two-dimensional alloy