TY - JOUR
T1 - Water reaction on SrTiO3(0 0 1)
T2 - Promotion effect due to condensation
AU - Kato, Hiroyuki S.
AU - Shiraki, Susumu
AU - Nantoh, Masashi
AU - Kawai, Maki
N1 - Funding Information:
We thank Mr. K. Iwahori and Dr. S. Watanabe for useful advice on the substrate treatments, and Dr. K. Akagi for important discussion on the reactivity of condensed water. Financial support for the present study was provided in part by PRESTO (Precursory Research for Embryonic Science and Technology), JST and the Grant-in-Aid for Scientific Research on Priority Areas “Surface Chemistry of Condensed Molecules” from the Ministry of Education, Culture, Sports, Science and Technology.
PY - 2003/10/20
Y1 - 2003/10/20
N2 - Reactivity of water molecules on atomically flat SrTiO3(00 1) surfaces was investigated with a wide range of the water partial pressure from 10-4 to 103 Pa, by means of scanning probe microscopy (SPM) at room temperature. The reactivity on SrTiO3(00 1) was observed by monitoring the microscopic friction contrast reflecting SrO and TiO2 terraces, since the contrast is enhanced by a preferential water reaction on the SrO terraces. The remarkable enhancement of the water reactivity was observed at the partial pressure of 103 Pa. A simple estimation revealed that, at this pressure, a condensed water layer is formed on the surface, which was confirmed by the temperature dependence measurements. We conclude that the water reaction on SrTiO3(0 0 1) is promoted by the condensation, and propose possible promotion mechanisms relating to the condensed water properties.
AB - Reactivity of water molecules on atomically flat SrTiO3(00 1) surfaces was investigated with a wide range of the water partial pressure from 10-4 to 103 Pa, by means of scanning probe microscopy (SPM) at room temperature. The reactivity on SrTiO3(00 1) was observed by monitoring the microscopic friction contrast reflecting SrO and TiO2 terraces, since the contrast is enhanced by a preferential water reaction on the SrO terraces. The remarkable enhancement of the water reactivity was observed at the partial pressure of 103 Pa. A simple estimation revealed that, at this pressure, a condensed water layer is formed on the surface, which was confirmed by the temperature dependence measurements. We conclude that the water reaction on SrTiO3(0 0 1) is promoted by the condensation, and propose possible promotion mechanisms relating to the condensed water properties.
KW - Atomic force microscopy
KW - Low index single crystal surfaces
KW - Solid-liquid interfaces
KW - Surface chemical reaction
KW - Water
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U2 - 10.1016/j.susc.2003.08.036
DO - 10.1016/j.susc.2003.08.036
M3 - Article
AN - SCOPUS:0141993767
SN - 0039-6028
VL - 544
SP - L722-L728
JO - Surface Science
JF - Surface Science
IS - 2-3
ER -