Atom-resolved observation of Na ensembles activating CO2 adsorption on a TiO2(110)-(1 × 1) surface as the genesis of basic sites
作者： Hiroshi Onishi , Yasuhiro Iwasawa
DOI: 10.1007/BF00806905
关键词: Scanning tunneling microscope 、 Substrate (electronics) 、 Crystallography 、 Inorganic chemistry 、 Adsorption 、 Catalysis 、 Ionization 、 Alkali metal 、 Atom 、 HOMO/LUMO 、 Chemistry
摘要: We have succeeded in observing the structure-sensitive reaction of CO2 with TiO2(l 10)-(1 × 1) surfaces modified Na adatoms by scanning tunneling microscopy. At low coverages (0.4 atom/nm2 or less) are ionized and adsorbed on exposed Ti-rows substrate. A p(4 2) order locally appears at 0.6 atom/nm2, a c(4 develops 0.9 atom/ran2. Those Na-modified to 102 L room temperature. Post-exposure observation finds chains bright particles surface. The asymmetric topography individual is assigned distribution LUMO carbonate. In contrast, dispersed lower unable react all. genesis strong basic sites thus suggested not be linearly correlated quantity, but ordered structure adatoms.
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