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Scanning tunneling microscopy studies of Mn-doped CeOx(111) interfaces

Paper ID Volume ID Publish Year Pages File Format Full-Text
45524 46413 2016 6 PDF Available
Title
Scanning tunneling microscopy studies of Mn-doped CeOx(111) interfaces
Abstract

•Mn is oxidized to Mn2+ upon deposition on CeOx(111) at 300 K.•Atomic-layer high of MnO small features are formed on CeOx(111) at 300 K.•Two-dimensional MnO domains can be formed after heating Mn/ceria surfaces to 800 K.•Doping ceria with Mn can form mixed Mn-Ce oxide interfaces.

The growth and structure of Mn on reducible ceria were investigated under ultrahigh vacuum conditions with X-ray photoelectron spectroscopy, low energy electron diffraction and scanning tunneling microscopy techniques. Submonolayer coverage of Mn was deposited on well-ordered CeOx(111) (1.5 < x < 2) thin films by physical vapor deposition method at room temperature. Mn is oxidized and formally in the +2 oxidation state on both fully oxidized and partially reduced ceria. Oxidation of Mn is accompanied with the reduction of ceria. STM results show the presence of atomic-layer high islands of Mn forming Mn-O-Ce linkages uniformly distributed on the ceria surface. With heating to higher temperatures, these MnO features can coalesce to form slightly larger two-dimensional structures. Our combined spectroscopy and microscopy studies demonstrate a strong interaction between Mn and ceria supports. Introduction of Mn can form mixed Mn-Ce oxides at the interface which can represent model metal-doped ceria surfaces for further examination of the chemical behavior.

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Keywords
Ceria; Manganese; Dopant; Scanning tunneling microscopy; X-ray photoelectron spectroscopy
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Scanning tunneling microscopy studies of Mn-doped CeOx(111) interfaces
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 197, 15 November 2016, Pages 337–342
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us