About: Surface preparation of TiO2 anatase (101): Pitfalls and how to avoid them

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	TiO2 anatase is a material of high technological importance, yet studies on well-defined model surfaces are scarce. The main impediment to fundamental research of this material is the lack of high-purity single crystals of a sufficient size. Natural anatase crystals always contain impurities, while synthetic crystals are pure but usually very small. We discuss optimum surface preparation procedures that result in clean surfaces under UHV conditions and the best ways to mount small crystals on sample plates. The influence of bulk impurities on surface preparation is discussed. The most troublesome impurity in natural TiO2 crystals is Fe. Upon annealing the crystal in partial O2 pressure Fe segregates, resulting in overgrowth of iron oxide on the surface. Based on the temperature-dependence of O-induced Fe segregation, optimum sample treatment procedures are proposed. Finally, we show that the surface roughness on the anatase (101) surface increases with the number of sputter-anneal cycles. Possible reasons and ways to revert this process are described. TiO2 anatase is a material of high technological importance, yet studies on well-defined model surfaces are scarce. The main impediment to fundamental research of this material is the lack of high-purity single crystals of a sufficient size. Natural anatase crystals always contain impurities, while synthetic crystals are pure but usually very small. We discuss optimum surface preparation procedures that result in clean surfaces under UHV conditions and the best ways to mount small crystals on sample plates. The influence of bulk impurities on surface preparation is discussed. The most troublesome impurity in natural TiO2 crystals is Fe. Upon annealing the crystal in partial O2 pressure Fe segregates, resulting in overgrowth of iron oxide on the surface. Based on the temperature-dependence of O-induced Fe segregation, optimum sample treatment procedures are proposed. Finally, we show that the surface roughness on the anatase (101) surface increases with the number of sputter-anneal cycles. Possible reasons and ways to revert this process are described. (en)
Title	Surface preparation of TiO2 anatase (101): Pitfalls and how to avoid them Surface preparation of TiO2 anatase (101): Pitfalls and how to avoid them (en)
skos:prefLabel	Surface preparation of TiO2 anatase (101): Pitfalls and how to avoid them Surface preparation of TiO2 anatase (101): Pitfalls and how to avoid them (en)
skos:notation	RIV/61388955:_____/14:00429110!RIV15-GA0-61388955
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA13-07724S)
http://linked.open...iv/cisloPeriodika	AUG 2014
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Kavan, Ladislav Mansfeldová, Věra
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	48652
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/14:00429110
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	TiO2; anatase; sample preparation (en)
http://linked.open.../riv/klicoveSlovo	TiO2 anatase sample preparation
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[1C98B834E751]
http://linked.open...i/riv/nazevZdroje	Surface Science
http://linked.open...in/vavai/riv/obor	CG
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	Materials engineering towards Innovative Graetzel solar cells
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	626
http://linked.open...iv/tvurceVysledku	Kavan, Ladislav Mansfeldová, Věra Schmid, M. Setvín, M. Daniel, B. Diebold, U. Fidler, M. Scheiber, P.
http://linked.open...ain/vavai/riv/wos	000337866900010
issn	0039-6028
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.susc.2014.04.001

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