AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP29
Oxygen Induced Reconstructions and Epitaxial Growth of MoO2(100) on Mo(112) : A Combined STM and LEED Study

Tuesday, November 5, 2002, 5:30 pm, Room Exhibit Hall B2

Session: Surface Science Poster Session
Presenter: B.K. Min, Texas A&M University
Authors: B.K. Min, Texas A&M University
A.K. Santra, Texas A&M University
D.W. Goodman, Texas A&M University
Correspondent: Click to Email
Oxygen chemisorption followed by oxidation of Mo(112) has been investigated in detail by the use of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Oxygen-induced p(2x3)-O, p(1x2)-O and p(1x3)-O missing row reconstructed surface structures are observed using STM and are shown to be dependent on the substrate temperature during oxygen adsorption. Atomically resolved STM data explain the undulated LEED pattern observed for the p(1x3)-O surface. This is the first direct demonstration of the epitaxial growth of MoO2(100) on a Mo(112) surface where the p(1x3)-O reconstructed surface is shown to be the precursor. A new oxide surface has been observed that corresponds to the c(2x2) reconstruction of MoO2(100) and correlates with the onset of oxide formation. Oxidation at 1250K produces a mixture of MoO2 and MoO3 (3:1) as determined by XPS and AES.