Affordable Access

Publisher Website

The aluminium–alcohol interface: Methanol on clean Al(1 1 1) surface

Elsevier B.V.
Publication Date
DOI: 10.1016/s0039-6028(02)02213-6
  • Photoemission (Total Yield)
  • Work Function Measurements
  • Thermal Desorption Spectroscopy
  • Aluminum
  • Alcohols


Abstract The adsorption and decomposition pathways of methanol on Al(1 1 1) at 90 K and 300 K have been studied using UPS, work function and thermal desorption spectroscopy measurements over a wide temperature range. Dissociative adsorption of methanol occurs at 90 K for low coverage ( Θ<1/4 monolayer) to CH 3O ads. and H and the chemisorbed intact methanol were found as the dominant adsorbate species at Θ≅1 monolayer (1.4 L exposure) coverage. The relative energy shift of the O–H orbital (7a ′) to higher binding energy indicates a strong hydrogen bonding in the multilayer. As a stable reaction intermediate, the surface methoxy species was formed on heating the multilayer to ∼170 K. This methoxy overlayer decomposed at high temperature, desorbed as CH 4 and H 2, and left only O on the surface. A methoxy species was observed for 300 K adsorption which has different band energy and shape compare to simple methoxy overlayer observed at 170 K. The work function of aluminium decreased largely due to the adsorption of methanol.

There are no comments yet on this publication. Be the first to share your thoughts.