Preparation of Nanocrystalline Titania Thin Films by Using Pure and Water-modified Supercritical Carbon Dioxide.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F16%3A00467192" target="_blank" >RIV/67985858:_____/16:00467192 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/16:10326634 RIV/61989100:27710/16:86100032

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.supflu.2016.07.007" target="_blank" >http://dx.doi.org/10.1016/j.supflu.2016.07.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.supflu.2016.07.007" target="_blank" >10.1016/j.supflu.2016.07.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Preparation of Nanocrystalline Titania Thin Films by Using Pure and Water-modified Supercritical Carbon Dioxide.

Popis výsledku v původním jazyce

Processing by pure and water-modified (30 wt.%) supercritical carbon dioxide and by subcritical water were utilized for the direct preparation of highly pure TiO2 anatase thin films without any subsequent thermal treatment. One step processing was compared with the two or three step processing combining pure and modified CO2. The effect of temperature (40-150 degrees C) and the amount of CO2 (100-200g) passed through the high-pressure column on the (micro)structure and the purity of TiO2 thin films were examined at pressure of 30 MPa. Prepared thin films were characterized with respect to the structural properties and purity by Raman spectroscopy. The most promising thin films were analysed with respect to microstructural properties by means of X-ray diffraction to determine the phase composition, the crystallite-size and the crystallite-size distribution. High temperature had a positive effect on the crystallization as well as the purity of TiO2 thin films during the one step and multi-step processing. When TiO2 thin films were exposed to water-modified supercritical CO2 and temperature of 150 degrees C under pressure of 30 MPa, the desired crystalline structure of anatase was obtained. The anatase crystallites growth was mainly influenced by the presence of water. Anatase crystallites sizes of 2-12 nm were obtained depending on the processing method on both investigated substrates (soda-lime glass and monocrystalline Si) on which the TiO2 thin films were deposited. Using one step or multi-step processing by water-modified supercritical CO2 any undesirable effects such as Na* ions diffusion from the soda-lime glass substrate to the one-layer TiO2 film, having negative effect on crystallization of anatase, did not take place. The universality of developed processing by pure and water-modified supercritical CO2 for preparation of TiO2 anatase thin films was successfully confirmed for two different substrates.

Název v anglickém jazyce

Preparation of Nanocrystalline Titania Thin Films by Using Pure and Water-modified Supercritical Carbon Dioxide.

Popis výsledku anglicky

Processing by pure and water-modified (30 wt.%) supercritical carbon dioxide and by subcritical water were utilized for the direct preparation of highly pure TiO2 anatase thin films without any subsequent thermal treatment. One step processing was compared with the two or three step processing combining pure and modified CO2. The effect of temperature (40-150 degrees C) and the amount of CO2 (100-200g) passed through the high-pressure column on the (micro)structure and the purity of TiO2 thin films were examined at pressure of 30 MPa. Prepared thin films were characterized with respect to the structural properties and purity by Raman spectroscopy. The most promising thin films were analysed with respect to microstructural properties by means of X-ray diffraction to determine the phase composition, the crystallite-size and the crystallite-size distribution. High temperature had a positive effect on the crystallization as well as the purity of TiO2 thin films during the one step and multi-step processing. When TiO2 thin films were exposed to water-modified supercritical CO2 and temperature of 150 degrees C under pressure of 30 MPa, the desired crystalline structure of anatase was obtained. The anatase crystallites growth was mainly influenced by the presence of water. Anatase crystallites sizes of 2-12 nm were obtained depending on the processing method on both investigated substrates (soda-lime glass and monocrystalline Si) on which the TiO2 thin films were deposited. Using one step or multi-step processing by water-modified supercritical CO2 any undesirable effects such as Na* ions diffusion from the soda-lime glass substrate to the one-layer TiO2 film, having negative effect on crystallization of anatase, did not take place. The universality of developed processing by pure and water-modified supercritical CO2 for preparation of TiO2 anatase thin films was successfully confirmed for two different substrates.

Druh

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

CEP obor

CA - Anorganická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/GA14-23274S" target="_blank" >GA14-23274S: Nekonvenční příprava nanostrukturovaných oxidů kovů pomocí přetlakových a superkritických tekutin</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Supercritical Fluids

ISSN

0896-8446

e-ISSN

—

Svazek periodika

117

Číslo periodika v rámci svazku

NOV 2016

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

289-296

Kód UT WoS článku

000382410800031

EID výsledku v databázi Scopus

2-s2.0-84989881088