Probing hot electron flow generated on Pt nanoparticles with Au/TiO(2) Schottky diodes during catalytic CO oxidation

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Hot electron flow generated on colloid platinum nanoparticles during exothermic catalytic carbon monoxide oxidation was directly detected with Au/TiO2 diodes. Although Au/TiO2 diodes are not catalytically active, platinum nanoparticles on Au/TiO2 exhibit both chemicurrent and catalytic turnover rate. Hot electrons are generated on the surface of the metal nanoparticles and go over the Schottky energy barrier between Au and TiO2. The continuous Au layer ensures that the metal nanoparticles are electrically connected to the device. The overall thickness of the metal assembly (nanoparticles and Au thin film) is comparable to the mean free path of hot electrons, resulting in ballistic transport through the metal. The chemicurrent and chemical reactivity of nanoparticles with citrate, hexadecylamine, hexadecylthiol, and TTAB (tetradecyltrimethylammonium bromide) capping agents were measured during catalytic CO oxidation at pressures of 100 Torr O-2 and 40 Torr CO at 373 similar to 513 K. We found that chemicurrent yield varies with each capping agent but always decreases with increasing temperature. We suggest that this inverse temperature dependence is associated with the influence of charging effects due to the organic capping layer during hot electron transport through the metal-oxide interface.
Publisher
AMER CHEMICAL SOC
Issue Date
2008-08
Language
English
Article Type
Article
Keywords

METAL-SUPPORT INTERACTIONS; HETEROGENEOUS CATALYSIS; NOBLE-METALS; NANODIODE; SURFACE; HYDROGENATION; NANOCRYSTALS; NANOSCIENCE; PROMOTION; SCIENCE

Citation

NANO LETTERS, v.8, no.8, pp.2388 - 2392

ISSN
1530-6984
DOI
10.1021/nl8012456
URI
http://hdl.handle.net/10203/90476
Appears in Collection
EEW-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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