Abstract
The interaction of boron with Mo(100) and its effect on surface reactivity have been investigated for the first time. Boron-covered surfaces can be prepared by adsorption and decomposition of diborane (B2H6) at 300 K. The B(1s) binding energy (BE) measured by XPS increases approximately linearly with boron coverage from 186.9 eV at 0.2 monolayer to 187.6 eV at 1.1 monolayers (saturation coverage), indicative of coverage-dependent B-B interactions. The absence of multiple B(1s) peaks or peak broadening suggests the overlayer grows by uniformly filling the available surface sites. After annealing to 1073 K and above, two distinct phases are formed: a low-coverage phase (∼0.2 monolayer) with B(1s) BE = 186.8 eV and a three-dimensional, B-rich, surface "boride" phase (MoB2) with B(1s) BE = 188.2 eV. The assignment of the latter phase is established by comparison of the B(1s) BE with the literature value for MoB2. The B(1s) signal disappears upon heating above 1700 K, indicating loss of surface boron. Adsorption of carbon monoxide, ethene, propene, and 3,3,3-trifluoropropene on B-covered surfaces was studied. Comparison of the results with data for adsorption of the same molecules on carbon- and oxygen-modified Mo(100) suggests that the B adatoms are not located in 4-fold hollow sites on the surface.
| Original language | English |
|---|---|
| Pages (from-to) | 1015-1025 |
| Number of pages | 11 |
| Journal | Langmuir |
| Volume | 3 |
| Issue number | 6 |
| Publication status | Published - 1987 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry
Cite this
Adsorption of boron on molybdenum(100) and its effect on chemisorption of carbon monoxide, ethene, propene, and 3,3,3-trifluoropropene. / Fryberger, T. B.; Grant, J. L.; Stair, Peter C.
In: Langmuir, Vol. 3, No. 6, 1987, p. 1015-1025.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Adsorption of boron on molybdenum(100) and its effect on chemisorption of carbon monoxide, ethene, propene, and 3,3,3-trifluoropropene
AU - Fryberger, T. B.
AU - Grant, J. L.
AU - Stair, Peter C
PY - 1987
Y1 - 1987
N2 - The interaction of boron with Mo(100) and its effect on surface reactivity have been investigated for the first time. Boron-covered surfaces can be prepared by adsorption and decomposition of diborane (B2H6) at 300 K. The B(1s) binding energy (BE) measured by XPS increases approximately linearly with boron coverage from 186.9 eV at 0.2 monolayer to 187.6 eV at 1.1 monolayers (saturation coverage), indicative of coverage-dependent B-B interactions. The absence of multiple B(1s) peaks or peak broadening suggests the overlayer grows by uniformly filling the available surface sites. After annealing to 1073 K and above, two distinct phases are formed: a low-coverage phase (∼0.2 monolayer) with B(1s) BE = 186.8 eV and a three-dimensional, B-rich, surface "boride" phase (MoB2) with B(1s) BE = 188.2 eV. The assignment of the latter phase is established by comparison of the B(1s) BE with the literature value for MoB2. The B(1s) signal disappears upon heating above 1700 K, indicating loss of surface boron. Adsorption of carbon monoxide, ethene, propene, and 3,3,3-trifluoropropene on B-covered surfaces was studied. Comparison of the results with data for adsorption of the same molecules on carbon- and oxygen-modified Mo(100) suggests that the B adatoms are not located in 4-fold hollow sites on the surface.
AB - The interaction of boron with Mo(100) and its effect on surface reactivity have been investigated for the first time. Boron-covered surfaces can be prepared by adsorption and decomposition of diborane (B2H6) at 300 K. The B(1s) binding energy (BE) measured by XPS increases approximately linearly with boron coverage from 186.9 eV at 0.2 monolayer to 187.6 eV at 1.1 monolayers (saturation coverage), indicative of coverage-dependent B-B interactions. The absence of multiple B(1s) peaks or peak broadening suggests the overlayer grows by uniformly filling the available surface sites. After annealing to 1073 K and above, two distinct phases are formed: a low-coverage phase (∼0.2 monolayer) with B(1s) BE = 186.8 eV and a three-dimensional, B-rich, surface "boride" phase (MoB2) with B(1s) BE = 188.2 eV. The assignment of the latter phase is established by comparison of the B(1s) BE with the literature value for MoB2. The B(1s) signal disappears upon heating above 1700 K, indicating loss of surface boron. Adsorption of carbon monoxide, ethene, propene, and 3,3,3-trifluoropropene on B-covered surfaces was studied. Comparison of the results with data for adsorption of the same molecules on carbon- and oxygen-modified Mo(100) suggests that the B adatoms are not located in 4-fold hollow sites on the surface.
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M3 - Article
AN - SCOPUS:0040896623
VL - 3
SP - 1015
EP - 1025
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 6
ER -