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TiO2(110)-(1×1) supported Cu particles: An FT-RAIRS investigation

TiO2(110)-(1×1) supported Cu particles: An FT-RAIRS investigation
TiO2(110)-(1×1) supported Cu particles: An FT-RAIRS investigation
The morphology of TiO2(110)-(1 × 1) supported Cu particles has been investigated by Fourier Transform Reflection Absorption Infrared Spectroscopy (FT-RAIRS), employing adsorbed CO as a probe molecule sensitive to local surface structure. For Cu coverage (deposited at 300 K) less than 2.85 MLE nucleated Cu particles in the range 2 nm–4 nm are formed, as indicated by a final state shift in the core level Cu(2p3/2) binding energy and by the existence of only transmission bands in the FT-RAIRS spectra for adsorbed CO. ?S(CO) indicates that these small particles expose sites similar to those of the stepped Cu surfaces Cu(211), Cu(311), and Cu(755). At Cu coverages in the range of 6 MLE and above, corresponding to particle sizes above 4.6 nm, ?S(CO) indicates the predominance of (110), (100) and (111) adsorption sites. Annealing the Cu layers to 650 K results in the slight growth of the particle sizes, and transformation of the CO adsorption sites corresponding to the close packed facets. The transformation of the local dielectric from that of titania to that dominated by the Cu particle is shown to take place between 3.7 and 4.2 nm, and this change is also to a smaller extent sensitive to the dispersion of the particles.

titania, copper, co, supported particles, ft-rairs
0039-6028
174-178
Anastasopoulos, Alexandros
7280a68f-3800-45a0-bbad-0e054707eb3b
Hayden, Brian E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Anastasopoulos, Alexandros
7280a68f-3800-45a0-bbad-0e054707eb3b
Hayden, Brian E.
aea74f68-2264-4487-9d84-5b12ddbbb331

Anastasopoulos, Alexandros and Hayden, Brian E. (2011) TiO2(110)-(1×1) supported Cu particles: An FT-RAIRS investigation. Surface Science, 605 (1-2), 174-178.

Record type: Article

Abstract

The morphology of TiO2(110)-(1 × 1) supported Cu particles has been investigated by Fourier Transform Reflection Absorption Infrared Spectroscopy (FT-RAIRS), employing adsorbed CO as a probe molecule sensitive to local surface structure. For Cu coverage (deposited at 300 K) less than 2.85 MLE nucleated Cu particles in the range 2 nm–4 nm are formed, as indicated by a final state shift in the core level Cu(2p3/2) binding energy and by the existence of only transmission bands in the FT-RAIRS spectra for adsorbed CO. ?S(CO) indicates that these small particles expose sites similar to those of the stepped Cu surfaces Cu(211), Cu(311), and Cu(755). At Cu coverages in the range of 6 MLE and above, corresponding to particle sizes above 4.6 nm, ?S(CO) indicates the predominance of (110), (100) and (111) adsorption sites. Annealing the Cu layers to 650 K results in the slight growth of the particle sizes, and transformation of the CO adsorption sites corresponding to the close packed facets. The transformation of the local dielectric from that of titania to that dominated by the Cu particle is shown to take place between 3.7 and 4.2 nm, and this change is also to a smaller extent sensitive to the dispersion of the particles.

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More information

Published date: January 2011
Keywords: titania, copper, co, supported particles, ft-rairs

Identifiers

Local EPrints ID: 178431
URI: https://eprints.soton.ac.uk/id/eprint/178431
ISSN: 0039-6028
PURE UUID: cecabdc8-ec0c-4296-ae70-3397c115fa9e
ORCID for Brian E. Hayden: ORCID iD orcid.org/0000-0002-7762-1812

Catalogue record

Date deposited: 24 Mar 2011 15:22
Last modified: 06 Jun 2018 13:16

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