Abstract
Stearic acid (HST) Langmuir-Blodgett films (LBFs) were investigated on Si(111), GaAs(110) and Cd x Hg 1- x Te(111) substrates with ellipsometry, X-ray photoelectron spectroscopy (XPS), low energy electron diffraction and work function measurements. Silicon and GaAs surfaces were initially covered with amorphous native oxide layers while the Cd x Hg 1- x Te surface was structurally ordered owing to argon bombardment and annealing. For all the cases the hydrophobic nature of the substrate, Y-type bilayer formation and an inclination at 30° of the molecular axis to the surface normal were observed. Two-dimensional ordering of the HST bilayer with hexagonal symmetry and translational period 0.5 nm took place on Cd x Hg 1- x Te(111) substrates. XPS and work function experiments have demonstrated the perfection of this system. Surface terraces and a (2 x 2) adsorption phase seem to be the most probable reasons for LBF ordering on Cd x Hg 1- x Te(111) substrates.
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