"Synthesis of MoS2 and MoSe2 Films with Vertically Aligned Layers"

Desheng Kong : Haotian Wang, Judy J. Cha, Mauro Pasta, Kristie J. Koski, Jie Yao, and Yi Cui; Nano Letters, 02/06/13.

Additional Authors: Haotian Wang, Judy J. Cha, Mauro Pasta, Kristie J. Koski, Jie Yao, and Yi Cui

Abstract:

Layered materials consist of molecular layers stacked together by weak interlayer interactions. They often crystallize to form atomically smooth thin films, nanotubes, and platelet or fullerene-like nanoparticles due to the anisotropic bonding. Structures that predominately expose edges of the layers exhibit high surface energy and are often considered unstable. In this communication, we present a synthesis process to grow MoS2 and MoSe2 thin films with vertically aligned layers, thereby maximally exposing the edges on the film surface. Such edge-terminated films are metastable structures of MoS2 and MoSe2, which may find applications in diverse catalytic reactions. We have confirmed their catalytic activity in a hydrogen evolution reaction (HER), in which the exchange current density correlates directly with the density of the exposed edge sites.