RHEED and XPS study of palladium interaction with cerium oxide surface

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405898" target="_blank" >RIV/00216208:11320/19:10405898 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xncO6BXSiv" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xncO6BXSiv</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.vacuum.2019.06.023" target="_blank" >10.1016/j.vacuum.2019.06.023</a>

Jazyk výsledku

angličtina

Název v původním jazyce

RHEED and XPS study of palladium interaction with cerium oxide surface

Popis výsledku v původním jazyce

In the present studies we investigated structural and electronic properties of Pd nanoclusters deposited on the surface of epitaxial CeO2 thin film grown on Cu(111) single-crystal. The structural and electronic properties were investigated by means of RHEED and XPS methods. The CeO2 thin film with (111) surface orientation prepared by reactive evaporation was used as a substrate for Pd deposition. The RHEED analysis has shown two populations of Pd nanoclusters having FCC structure and (111) epitaxial plane. Intensity analysis of diffraction spots has shown preferential growth of one population. Precise measurement of the position of diffraction spots permits to investigate changes of lattice parameter of Pd during deposition and annealing. A contraction of the Pd lattice with respect to bulk value was observed. The XPS measurement has shown that the deposition of Pd on CeO2(111) surface led to the apparent partial reduction of cerium oxide attributed to the charge transfer given by metal substrate interaction. The interaction peak was found also in the Pd 3d photoelectron spectrum. Thermal stability and deposit-substrate interaction were investigated up to temperature of 600 degrees C. At high annealing temperatures encapsulation of Pd nanoclusters followed by a formation of Pd-Cu bimetallic alloy were observed.

Název v anglickém jazyce

RHEED and XPS study of palladium interaction with cerium oxide surface

Popis výsledku anglicky

In the present studies we investigated structural and electronic properties of Pd nanoclusters deposited on the surface of epitaxial CeO2 thin film grown on Cu(111) single-crystal. The structural and electronic properties were investigated by means of RHEED and XPS methods. The CeO2 thin film with (111) surface orientation prepared by reactive evaporation was used as a substrate for Pd deposition. The RHEED analysis has shown two populations of Pd nanoclusters having FCC structure and (111) epitaxial plane. Intensity analysis of diffraction spots has shown preferential growth of one population. Precise measurement of the position of diffraction spots permits to investigate changes of lattice parameter of Pd during deposition and annealing. A contraction of the Pd lattice with respect to bulk value was observed. The XPS measurement has shown that the deposition of Pd on CeO2(111) surface led to the apparent partial reduction of cerium oxide attributed to the charge transfer given by metal substrate interaction. The interaction peak was found also in the Pd 3d photoelectron spectrum. Thermal stability and deposit-substrate interaction were investigated up to temperature of 600 degrees C. At high annealing temperatures encapsulation of Pd nanoclusters followed by a formation of Pd-Cu bimetallic alloy were observed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA15-06759S" target="_blank" >GA15-06759S: Modelové systémy pro katalýzu na jednotlivých atomech</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Vacuum

ISSN

0042-207X

e-ISSN

—

Svazek periodika

167

Číslo periodika v rámci svazku

Jun

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

438-444

Kód UT WoS článku

000482245800063

EID výsledku v databázi Scopus

2-s2.0-85068379342