Novel formation of Ag nanoparticles on α-Ag2WO4 by femtosecond laser irradiation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24620%2F17%3A00004335" target="_blank" >RIV/46747885:24620/17:00004335 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.nanocon.eu/cz/" target="_blank" >https://www.nanocon.eu/cz/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Novel formation of Ag nanoparticles on α-Ag2WO4 by femtosecond laser irradiation

Popis výsledku v původním jazyce

α-Ag2WO4 semiconductor, has recently emerged as a multifunctional alternative over conventional wide band gap semiconductors, owing to its potential in applications such as photocalalysis, photoswitching, among others. Recent studies have also demonstrated that crystals of α-Ag2WO4 showed a metal nanoparticle (MNPs) growth attached to the semiconductor framework, which may lead to outstanding applications due to Ag segregation, such as ozone sensing and bacteriocidicity. Nevertheless, up to now the metal nanoparticle growth has been limited to the scale of Transmission Electron Microscope (TEM) processing, hampering in this way its potential use. In this communication, a femtosecond laser radiation source is used to scale-up the MNP growth of the material, and the product’s bactericidal activity is tested. α-Ag2WO4 was irradiated by a Ti:sapphire laser beam with a burst of 30 fs pulses at two different fluence regimens, a low fluence regime which only promotes the synthesis of spherical Ag NPs and a high fluence regime which promotes a high Ag NPs growth rate accompanied with the synthesis of AgxWyOz nanoparticles. All the resultant species were examined and identified using TEM and energy dispersive spectroscopy. Furthermore, the bactericidal properties of the synthesized species were tested against Methicillin-Resistant Staphylococcus Aureus ATCC 33591, where the samples irradiated by femtosecond radiation at a high fluence regime show the best performance found in the literature up to now, a 32-fold improvement over non-irradiated α-Ag2WO4. We believe that the results found in here constitute an improvement over conventional multifunctional semiconductor synthesis approaches which may inspire future developments.

Název v anglickém jazyce

Novel formation of Ag nanoparticles on α-Ag2WO4 by femtosecond laser irradiation

Popis výsledku anglicky

α-Ag2WO4 semiconductor, has recently emerged as a multifunctional alternative over conventional wide band gap semiconductors, owing to its potential in applications such as photocalalysis, photoswitching, among others. Recent studies have also demonstrated that crystals of α-Ag2WO4 showed a metal nanoparticle (MNPs) growth attached to the semiconductor framework, which may lead to outstanding applications due to Ag segregation, such as ozone sensing and bacteriocidicity. Nevertheless, up to now the metal nanoparticle growth has been limited to the scale of Transmission Electron Microscope (TEM) processing, hampering in this way its potential use. In this communication, a femtosecond laser radiation source is used to scale-up the MNP growth of the material, and the product’s bactericidal activity is tested. α-Ag2WO4 was irradiated by a Ti:sapphire laser beam with a burst of 30 fs pulses at two different fluence regimens, a low fluence regime which only promotes the synthesis of spherical Ag NPs and a high fluence regime which promotes a high Ag NPs growth rate accompanied with the synthesis of AgxWyOz nanoparticles. All the resultant species were examined and identified using TEM and energy dispersive spectroscopy. Furthermore, the bactericidal properties of the synthesized species were tested against Methicillin-Resistant Staphylococcus Aureus ATCC 33591, where the samples irradiated by femtosecond radiation at a high fluence regime show the best performance found in the literature up to now, a 32-fold improvement over non-irradiated α-Ag2WO4. We believe that the results found in here constitute an improvement over conventional multifunctional semiconductor synthesis approaches which may inspire future developments.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/LM2015073" target="_blank" >LM2015073: Nanomateriály a nanotechnologie pro ochranu životního prostředí a udržitelnou budoucnost</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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