AVS 52nd International Symposium
    Surface Science Monday Sessions
       Session SS-MoP

Paper SS-MoP23
Selective Reduction of MoO@sub 3@ Nanostructures on Au(111)

Monday, October 31, 2005, 5:00 pm, Room Exhibit Hall C&D

Session: Surface Science Poster Session
Presenter: D.S. Pinnaduwage, Harvard University
Authors: D.S. Pinnaduwage, Harvard University
X. Deng, Harvard University
M.M. Biener, Harvard University
C.M. Friend, Harvard University
Correspondent: Click to Email
Well-ordered MoO@sub 3@ nanostructures on Au(111) have been prepared using iterative dosing of Mo(CO)@sub 6@ and NO@sub 2@. A c(4x2) unit cell is observed for these nanostructures in scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). The presence of Mo@super 6+@ is confirmed by X-ray photoelectron spectroscopy (XPS). Selective reduction of MoO@sub 3@ nanostructures has been achieved by annealing at 650 K for varying times. Sheer planes are observed in STM due to the formation of Mo@super 5+@. Based on XPS data, ultimately, thermal reduction results in Mo@super 6+@ and Mo@super 5+@ at a 1:1 ratio on the Au surface. However, Mo@super 4+@ is absent in all thermal treatments, indicating the existence of a kinetic barrier for the reduction of either Mo@super 6+@/Mo@super 5+@ to Mo@super 4+@.