CW-Laser-Induced Solid-State Reactions in Mixed Micron-Sized Particles of Silicon Monoxide and Titanium Monoxide: Nano-Structured Composite with Visible Light Absorption

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F17%3A00480144" target="_blank" >RIV/61388980:_____/17:00480144 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/17:00480144 RIV/49777513:23640/17:43950035

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10904-017-0624-7" target="_blank" >http://dx.doi.org/10.1007/s10904-017-0624-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10904-017-0624-7" target="_blank" >10.1007/s10904-017-0624-7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

CW-Laser-Induced Solid-State Reactions in Mixed Micron-Sized Particles of Silicon Monoxide and Titanium Monoxide: Nano-Structured Composite with Visible Light Absorption

Popis výsledku v původním jazyce

Silica-titania mixed oxides and composites have been broadly examined for their physical and catalytic properties, but titanium monoxide-silicon monoxide counterparts have yet drawn very little attention. Here we report that laser-induced processing of mixed silicon and titanium monoxides results in reactions yielding a nanostructured Ti/Si/O composite absorbing visible light. Changes in the composition of intimately mixed mu m-sized particles of silicon monoxide (SiO) and titanium monoxide (TiO) induced by scanning of a cw CO2 laser beam along the TiO-SiO pellet surface were examined by FTIR and Raman spectroscopy, X-ray diffraction and electron microscopy. They are shown to consist in the evolution of TiO2 (rutile and anatase), titanium suboxides (Ti4.5O5, Ti2O3), silica and amorphous binary SiOx, TiOx and ternary SixTiyOz nano-phases which contain less or more O than SiO and TiO monoxides. These products are ascribed to concurrent silicothermal reduction of TiO and O-transfer between SiO and TiO due to interdiffusion of Si- and Ti-based species. These reactions taking place under transient localized heating are not inhibited by passivation shells around SiO and TiO particles. The laser-produced Ti/Si/O composite shows absorption band at 425 nm tailing up to 1100 nm. Its solar-light photocatalytic activity in decolorization of Methylene Blue is compared to that of the unheated SiO and TiO powders absorbing only in UV region.

Název v anglickém jazyce

CW-Laser-Induced Solid-State Reactions in Mixed Micron-Sized Particles of Silicon Monoxide and Titanium Monoxide: Nano-Structured Composite with Visible Light Absorption

Popis výsledku anglicky

Silica-titania mixed oxides and composites have been broadly examined for their physical and catalytic properties, but titanium monoxide-silicon monoxide counterparts have yet drawn very little attention. Here we report that laser-induced processing of mixed silicon and titanium monoxides results in reactions yielding a nanostructured Ti/Si/O composite absorbing visible light. Changes in the composition of intimately mixed mu m-sized particles of silicon monoxide (SiO) and titanium monoxide (TiO) induced by scanning of a cw CO2 laser beam along the TiO-SiO pellet surface were examined by FTIR and Raman spectroscopy, X-ray diffraction and electron microscopy. They are shown to consist in the evolution of TiO2 (rutile and anatase), titanium suboxides (Ti4.5O5, Ti2O3), silica and amorphous binary SiOx, TiOx and ternary SixTiyOz nano-phases which contain less or more O than SiO and TiO monoxides. These products are ascribed to concurrent silicothermal reduction of TiO and O-transfer between SiO and TiO due to interdiffusion of Si- and Ti-based species. These reactions taking place under transient localized heating are not inhibited by passivation shells around SiO and TiO particles. The laser-produced Ti/Si/O composite shows absorption band at 425 nm tailing up to 1100 nm. Its solar-light photocatalytic activity in decolorization of Methylene Blue is compared to that of the unheated SiO and TiO powders absorbing only in UV region.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Inorganic and Organometallic Polymers and Materials

ISSN

1574-1443

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

1640-1648

Kód UT WoS článku

000413145500004

EID výsledku v databázi Scopus

2-s2.0-85023751464