Direct growth of vertical MoS₂ Dendrites by Metal Organic Chemical Vapor Deposition

Abstract

MoS2 has been demonstrated to be a very promising material in wide variety of applications including nano-electronics, optoelectronics, solar cells, sensors, catalytic applications and so on. However, Controlled growth orientation of MoS2 thin films is the key requirement to realize their vast number of applications, as material has strong anisotropic properties, in addition chemically active edge sites over inert in-plane MoS2 flakes is more important for catalytic activities. Thermodynamically, growth of inert in-plane MoS2 is preferred due to less number of active sites on its surface over the edge-sites MoS2 and that making vertical growth difficult task. Here, we demonstrate for first time the chemical vapor deposition (CVD) of vertically standing molybdenum disulfide (MoS2) dendrites, with an combination of Molybdenum hexacarbonyl (Mo(CO)6) and Dimethyl disulfide (C2H6S2) as the novel kind of Mo and S precursors, respectively. MoS2 dendrites is a new type of MoS2 material, SEM and TEM results demonstrated the vertically oriented growth and structure has a tree-like crystal structure with high density of edge terminated MoS2. Moreover, leaves of those trees has sizes as small as10 nm and consist of MoS2 few atomics layers . While Raman confirm MoS2 quality of sheets with 3-4 layers. On optical properties side of dendrites , structure has high absorption cover all visible range of light and strong photoluminescence with wide peak centered around green light due to quantum confinement . These dendrites usually have unique physical and chemical properties, making them promising for range wide applications in many fields.