EPR study of 17O-enriched titania nanopowders under UV irradiation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F14%3A00427656" target="_blank" >RIV/61388955:_____/14:00427656 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.cattod.2013.11.026" target="_blank" >http://dx.doi.org/10.1016/j.cattod.2013.11.026</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2013.11.026" target="_blank" >10.1016/j.cattod.2013.11.026</a>

Jazyk výsledku

angličtina

Název v původním jazyce

EPR study of 17O-enriched titania nanopowders under UV irradiation

Popis výsledku v původním jazyce

Anatase and rutile nanoparticulate samples, prepared via TiCl4 hydrolysis using either ordinary or (17)Oenriched water (up to 90%) with subsequent heat-treatment under vacuum, were investigated by EPR spectroscopy upon UV photoexcitation in the temperature range 100-160 K. The experimental EPR spectra of photoexcited anatase (TiO2)-O-16 revealed the presence of paramagnetic signals attributed to Ti(III) species, two kinds of O- centers produced from lattice O2- ions, along with (O2 center dot-/HO2 center dot) radicals which originated from adsorbed molecular oxygen. The presence of O-17 atoms in the anatase crystal lattice was reflected in substantial EPR line broadening and the experimental spectrum was interpreted as a superposition of signals attributed to Ti(III) with axial symmetry arising from an interaction with an O-17 nucleus (g(perpendicular to) = 1.962, g(parallel to) = 1.923; A(perpendicular to) = 1.68 mT, A(parallel to) = 1.61 mT), the signal of a photogenerated hole O-17(

Název v anglickém jazyce

EPR study of 17O-enriched titania nanopowders under UV irradiation

Popis výsledku anglicky

Anatase and rutile nanoparticulate samples, prepared via TiCl4 hydrolysis using either ordinary or (17)Oenriched water (up to 90%) with subsequent heat-treatment under vacuum, were investigated by EPR spectroscopy upon UV photoexcitation in the temperature range 100-160 K. The experimental EPR spectra of photoexcited anatase (TiO2)-O-16 revealed the presence of paramagnetic signals attributed to Ti(III) species, two kinds of O- centers produced from lattice O2- ions, along with (O2 center dot-/HO2 center dot) radicals which originated from adsorbed molecular oxygen. The presence of O-17 atoms in the anatase crystal lattice was reflected in substantial EPR line broadening and the experimental spectrum was interpreted as a superposition of signals attributed to Ti(III) with axial symmetry arising from an interaction with an O-17 nucleus (g(perpendicular to) = 1.962, g(parallel to) = 1.923; A(perpendicular to) = 1.68 mT, A(parallel to) = 1.61 mT), the signal of a photogenerated hole O-17(

Druh

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

CEP obor

CG - Elektrochemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA13-07724S" target="_blank" >GA13-07724S: Materiálové inženýrství pro inovativní Graetzelovy solární články</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Catalysis Today

ISSN

0920-5861

e-ISSN

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Svazek periodika

230

Číslo periodika v rámci svazku

JUL 2014

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

112-118

Kód UT WoS článku

000333800300019

EID výsledku v databázi Scopus

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