Annealing of CH3I films on TiO2(110) studied with TPD and UV-induced desorption

Seong Kim, Peter C. Stair, Eric Weitz

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Annealing of CH3I films formed on TiO2(110) at 90 K has been investigated using thermal desorption and photodesorption. At a surface temperature of 90 K, the multilayer film of CH3I grows stochastically. Thermal desorption and photodesorption studies indicate that annealing a CH3I film at temperatures of 120-125 K for less than approx. 12 min induces the desorption of weakly bound molecules and produces two CH3I phases on TiO2(110): a two-dimensional (2D) monolayer phase and a three-dimensional (3D) multilayer phase. After annealing at approx. 125 K for 12 min, the 3D multilayer phase is completely desorbed and only the 2D monolayer phase is left on the TiO2(110) surface. This 2D layer has a saturation molecular density greater than that of the 1 ML film deposited at 90 K. When the annealing temperature is increased to above 130 K, the thermal stability of the 2D film increases and the number of the CH3I molecules left on the TiO2(110) surface decreases.

Original languageEnglish (US)
Pages (from-to)177-185
Number of pages9
JournalSurface Science
Volume445
Issue number2-3
DOIs
StatePublished - Jan 20 2000

Fingerprint

Temperature programmed desorption
Desorption
desorption
Annealing
Thermal desorption
annealing
Monolayers
Multilayers
Molecules
Multilayer films
Temperature
Thermodynamic stability
surface temperature
molecules
thermal stability
saturation
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Kim, Seong ; Stair, Peter C. ; Weitz, Eric. / Annealing of CH3I films on TiO2(110) studied with TPD and UV-induced desorption. In: Surface Science. 2000 ; Vol. 445, No. 2-3. pp. 177-185.
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Annealing of CH3I films on TiO2(110) studied with TPD and UV-induced desorption. / Kim, Seong; Stair, Peter C.; Weitz, Eric.

In: Surface Science, Vol. 445, No. 2-3, 20.01.2000, p. 177-185.

Research output: Contribution to journalArticle

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N2 - Annealing of CH3I films formed on TiO2(110) at 90 K has been investigated using thermal desorption and photodesorption. At a surface temperature of 90 K, the multilayer film of CH3I grows stochastically. Thermal desorption and photodesorption studies indicate that annealing a CH3I film at temperatures of 120-125 K for less than approx. 12 min induces the desorption of weakly bound molecules and produces two CH3I phases on TiO2(110): a two-dimensional (2D) monolayer phase and a three-dimensional (3D) multilayer phase. After annealing at approx. 125 K for 12 min, the 3D multilayer phase is completely desorbed and only the 2D monolayer phase is left on the TiO2(110) surface. This 2D layer has a saturation molecular density greater than that of the 1 ML film deposited at 90 K. When the annealing temperature is increased to above 130 K, the thermal stability of the 2D film increases and the number of the CH3I molecules left on the TiO2(110) surface decreases.

AB - Annealing of CH3I films formed on TiO2(110) at 90 K has been investigated using thermal desorption and photodesorption. At a surface temperature of 90 K, the multilayer film of CH3I grows stochastically. Thermal desorption and photodesorption studies indicate that annealing a CH3I film at temperatures of 120-125 K for less than approx. 12 min induces the desorption of weakly bound molecules and produces two CH3I phases on TiO2(110): a two-dimensional (2D) monolayer phase and a three-dimensional (3D) multilayer phase. After annealing at approx. 125 K for 12 min, the 3D multilayer phase is completely desorbed and only the 2D monolayer phase is left on the TiO2(110) surface. This 2D layer has a saturation molecular density greater than that of the 1 ML film deposited at 90 K. When the annealing temperature is increased to above 130 K, the thermal stability of the 2D film increases and the number of the CH3I molecules left on the TiO2(110) surface decreases.

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