Synthesis of Epitaxial MoS(2)/MoO(2) Core–Shell Nanowires by Two-Step Chemical Vapor Deposition with Turbulent Flow and Their Physical Properties

[Image: see text] MoO(2) nanowires (NWs), MoO(2)/MoS(2) core–shell NWs, and MoS(2) nanotubes (NTs) were synthesized by the turbulent flow chemical vapor deposition of MoO(2) using MoO(3), followed by sulfurization in the sulfur gas flow. The involvement of MoO(x) suboxide is suggested by density functional theory (DFT) calculations of the surface energies of MoO(2). The thickness of the MoS(2) layers can be controlled by precise tuning of sulfur vapor flow and temperatures. MoS(2) had an armchair-type winding topology due to the epitaxial relation with the MoO(2) NW surface. A single ∼ few-layer MoO(2)/MoS(2) core–shell structure showed photoluminescence after the treatment with a superacid. The resistivities of an individual MoO(2) NW and a MoS(2) NT were measured, and they showed metallic and semiconducting resistivity–temperature relationships, respectively.