MoS2 nanoflowers and their field-emission properties

Elegant three-dimensional MoS2 nanoflowers were uniformly formed via heating a MoO2 thin film in a vapor sulfur atmosphere. Tens to hundreds of petals were self-assembled within a single nanoflower. Each petal, 100-300 nm wide and only several nanometers thick, exhibited a hexagonal structure. The number of petal layers gradually decreased towards the edges, resulting in uniquely thin edges, typically less than 3 nm. The MoS2 nanoflowers appeared to be excellent field emitters displaying a current density of 0.01 and 10 mA/cm(2) at macroscopic fields of 4.5-5.5 and 7.6-8.6 V/mum, respectively; the electron field emission was consistent with the Fowler-Nordheim theory. (C) 2003 American Institute of Physics.