Multifunctional bandgap-reduced ZnO nanocrystals for photocatalysis, self-cleaning, and antibacterial glass surfaces

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F23%3A63564538" target="_blank" >RIV/70883521:28610/23:63564538 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0927775722022026?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0927775722022026?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.colsurfa.2022.130447" target="_blank" >10.1016/j.colsurfa.2022.130447</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Multifunctional bandgap-reduced ZnO nanocrystals for photocatalysis, self-cleaning, and antibacterial glass surfaces

Popis výsledku v původním jazyce

A set of ZnO nanocrystals assembly with tuneable reduced bandgaps was prepared via thermal decomposition of ZnO2 precursor. A detailed Raman and EPR analysis revealed ZnO rich in oxygen vacancies with concentration varying upon annealing temperature. The structural defect features corroborated with the bandgap variations indicate photocatalytic response in the visible-light, which was evaluated by using monochromatic LEDs (377, 401, and 429 nm wavelengths) for a correct assessment of the photocatalytic activities of samples in the close vicinities of their bandgaps. It was revealed, that bandgap reduced ZnO exhibits only little yet negligible pho-tocatalytic activity towards Methylene Blue discoloration under 429 nm diode. The Photocatalytic experiments using scavengers support the model that oxygen vacancies easily trap photo-excited electrons (whether VO+ and VO++ state) and, if the energy level of this donor state is close enough, the trapped electron could easily thermalize to the conduction band as well as recombine with photo-excited holes. Furthermore, oxygen vacancies rich ZnO nanocrystals treated glasses were prepared and their photocatalytic-induced self-cleaning property, wettability, and antibacterial activities were evaluated under both UV and visible-light. Besides excellent antibacterial activities against both S. aureus and E. coli, which was achieved even in dark, both photocatalytically-induced self-cleaning ability and wettability provided yet another indirect evidence of the inability of bandgap-reduced ZnO to become activated under visible-light irradiation.

Název v anglickém jazyce

Multifunctional bandgap-reduced ZnO nanocrystals for photocatalysis, self-cleaning, and antibacterial glass surfaces

Popis výsledku anglicky

A set of ZnO nanocrystals assembly with tuneable reduced bandgaps was prepared via thermal decomposition of ZnO2 precursor. A detailed Raman and EPR analysis revealed ZnO rich in oxygen vacancies with concentration varying upon annealing temperature. The structural defect features corroborated with the bandgap variations indicate photocatalytic response in the visible-light, which was evaluated by using monochromatic LEDs (377, 401, and 429 nm wavelengths) for a correct assessment of the photocatalytic activities of samples in the close vicinities of their bandgaps. It was revealed, that bandgap reduced ZnO exhibits only little yet negligible pho-tocatalytic activity towards Methylene Blue discoloration under 429 nm diode. The Photocatalytic experiments using scavengers support the model that oxygen vacancies easily trap photo-excited electrons (whether VO+ and VO++ state) and, if the energy level of this donor state is close enough, the trapped electron could easily thermalize to the conduction band as well as recombine with photo-excited holes. Furthermore, oxygen vacancies rich ZnO nanocrystals treated glasses were prepared and their photocatalytic-induced self-cleaning property, wettability, and antibacterial activities were evaluated under both UV and visible-light. Besides excellent antibacterial activities against both S. aureus and E. coli, which was achieved even in dark, both photocatalytically-induced self-cleaning ability and wettability provided yet another indirect evidence of the inability of bandgap-reduced ZnO to become activated under visible-light irradiation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Colloids and Surfaces A: Physicochemical and Engineering Aspects

ISSN

0927-7757

e-ISSN

—

Svazek periodika

656

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

18

Strana od-do

—

Kód UT WoS článku

000890081700002

EID výsledku v databázi Scopus

2-s2.0-85141255812