Bimetallic Nickel-Cobalt Nanosized Layers Supported on Polar ZnO Surfaces: Metal-Support Interaction and Alloy Effects Studied by Synchrotron Radiation X-ray Photoelectron Spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10130672" target="_blank" >RIV/00216208:11320/12:10130672 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/12:00437233

Výsledek na webu

<a href="http://dx.doi.org/10.1021/jp301219u" target="_blank" >http://dx.doi.org/10.1021/jp301219u</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jp301219u" target="_blank" >10.1021/jp301219u</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bimetallic Nickel-Cobalt Nanosized Layers Supported on Polar ZnO Surfaces: Metal-Support Interaction and Alloy Effects Studied by Synchrotron Radiation X-ray Photoelectron Spectroscopy

Popis výsledku v původním jazyce

The interaction of ultrathin bimetallic Ni-Co layers (0.25 and 1.5 nm) supported on polar (0001)Zn-ZnO and (000 (1) over bar )O-ZnO substrates was investigated by synchrotron-based photoelectron spectroscopy (PES) under ultrahigh vacuum (UHV) and O-2 environments. Monometallic Ni and Co layers were also characterized to highlight the influence of Ni-Co synergetic effects on the metal-support interaction. At room temperature, cobalt is partially oxidized, while nickel is metallic. The effect of ZnO surface termination is minor, while the influence of surface hydroxyl groups is discussed. Annealing at 773 K in UHV promotes oxidation of monometallic Ni and Co layers but has little influence on bimetallic Ni-Co. In addition, significant agglomeration of the Ni-Co overlayer is observed, with a parallel increase in the surface Co concentration. Agglomeration of Ni-Co is more pronounced on O-terminated ZnO. Upon annealing in 1 X 10(-6) mbar of O-2, both Ni and Co readily oxidize and redispers

Název v anglickém jazyce

Bimetallic Nickel-Cobalt Nanosized Layers Supported on Polar ZnO Surfaces: Metal-Support Interaction and Alloy Effects Studied by Synchrotron Radiation X-ray Photoelectron Spectroscopy

Popis výsledku anglicky

The interaction of ultrathin bimetallic Ni-Co layers (0.25 and 1.5 nm) supported on polar (0001)Zn-ZnO and (000 (1) over bar )O-ZnO substrates was investigated by synchrotron-based photoelectron spectroscopy (PES) under ultrahigh vacuum (UHV) and O-2 environments. Monometallic Ni and Co layers were also characterized to highlight the influence of Ni-Co synergetic effects on the metal-support interaction. At room temperature, cobalt is partially oxidized, while nickel is metallic. The effect of ZnO surface termination is minor, while the influence of surface hydroxyl groups is discussed. Annealing at 773 K in UHV promotes oxidation of monometallic Ni and Co layers but has little influence on bimetallic Ni-Co. In addition, significant agglomeration of the Ni-Co overlayer is observed, with a parallel increase in the surface Co concentration. Agglomeration of Ni-Co is more pronounced on O-terminated ZnO. Upon annealing in 1 X 10(-6) mbar of O-2, both Ni and Co readily oxidize and redispers

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

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Svazek periodika

116

Číslo periodika v rámci svazku

18

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

10048-10056

Kód UT WoS článku

000303848600025

EID výsledku v databázi Scopus

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