Details
| Original language | English |
|---|---|
| Pages (from-to) | 19141-19148 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry C |
| Volume | 115 |
| Issue number | 39 |
| Early online date | 15 Sept 2011 |
| Publication status | Published - 6 Oct 2011 |
Abstract
Self-organization of ultrathin vanadium oxide layers (θV < 0.5 MLE) on a Rh(111) surface during the H2 + O2 reaction has been investigated in the 10-6-10-4 mbar range using photoemission electron microscopy (PEEM) as a spatially resolving method. We observe that the homogeneous state is transformed via reaction fronts into macroscopic quasi-stationary patterns. In these patterns a condensation of V and O into stripes or islands takes place (θV < 0.5 MLE). The coarsening of the patterns with time follows a power-law dependence. The patterns are a nonequilibrium structure explained here tentatively as a result of reactive phase separation. Formation of the oxide distribution patterns is associated with a considerable memory effect. This memory effect can be exploited for microstructuring of the surface by applying a schedule for parameter variation. Decoration of such microstructures with nickel leads to channel-like structures through which pulses propagate during the H2 + O2 reaction.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 115, No. 39, 06.10.2011, p. 19141-19148.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Self-organization of ultrathin vanadium oxide layers on a Rh(111) surface during a catalytic reaction. Part I
T2 - A PEEM study
AU - Lovis, Florian
AU - Imbihl, Ronald
PY - 2011/10/6
Y1 - 2011/10/6
N2 - Self-organization of ultrathin vanadium oxide layers (θV < 0.5 MLE) on a Rh(111) surface during the H2 + O2 reaction has been investigated in the 10-6-10-4 mbar range using photoemission electron microscopy (PEEM) as a spatially resolving method. We observe that the homogeneous state is transformed via reaction fronts into macroscopic quasi-stationary patterns. In these patterns a condensation of V and O into stripes or islands takes place (θV < 0.5 MLE). The coarsening of the patterns with time follows a power-law dependence. The patterns are a nonequilibrium structure explained here tentatively as a result of reactive phase separation. Formation of the oxide distribution patterns is associated with a considerable memory effect. This memory effect can be exploited for microstructuring of the surface by applying a schedule for parameter variation. Decoration of such microstructures with nickel leads to channel-like structures through which pulses propagate during the H2 + O2 reaction.
AB - Self-organization of ultrathin vanadium oxide layers (θV < 0.5 MLE) on a Rh(111) surface during the H2 + O2 reaction has been investigated in the 10-6-10-4 mbar range using photoemission electron microscopy (PEEM) as a spatially resolving method. We observe that the homogeneous state is transformed via reaction fronts into macroscopic quasi-stationary patterns. In these patterns a condensation of V and O into stripes or islands takes place (θV < 0.5 MLE). The coarsening of the patterns with time follows a power-law dependence. The patterns are a nonequilibrium structure explained here tentatively as a result of reactive phase separation. Formation of the oxide distribution patterns is associated with a considerable memory effect. This memory effect can be exploited for microstructuring of the surface by applying a schedule for parameter variation. Decoration of such microstructures with nickel leads to channel-like structures through which pulses propagate during the H2 + O2 reaction.
UR - http://www.scopus.com/inward/record.url?scp=80053484746&partnerID=8YFLogxK
U2 - 10.1021/jp2065425
DO - 10.1021/jp2065425
M3 - Article
AN - SCOPUS:80053484746
VL - 115
SP - 19141
EP - 19148
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 39
ER -