In recent years, the knowledge that materials exhibit novel properties at the nano-scale has driven a search for functional nano-materials with useful applications. Among these, ultrathin metal oxide films have attracted attention for their application in reaction catalysis, yet mechanisms underlying this catalytic role have remained unclear.

Using a scanning tunneling microscope (STM) at ultra-low temperatures, the research team explored the dynamics of single water molecules interacting with a film of magnesium oxide (MgO) several atoms in thickness.

They discovered that by injecting tunnelling electrons into water molecules on the MgO surface, they could select between dissociation pathways: excitation of the molecule’s vibrational states induced dissociation into hydroxyl (H + OH), whereas excitation of its electronic states induced dissociation into atomic oxygen (O).

The controlled dissociation of water molecules via selected reaction pathways presents unique opportunities in targeted catalysis, particularly in the production of hydrogen, RIKEN says. While advancing the understanding of the dynamics of water molecules, the discovery also sets the stage for applications in the catalysis of more complex systems on insulating films.

Resources

• Hyung-Joon Shin, Jaehoon Jung, Kenta Motobayashi, Susumu Yanagisawa, Yoshitada Morikawa, Yousoo Kim & Maki Kawai (2010) State-selective dissociation of a single water molecule on an ultrathin MgO film. Nature Materials doi: 10.1038/nmat2740