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

Result code in 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>

Result on the web

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

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

21001 - Nano-materials (production and properties)

Project

<a href="/en/project/LM2015073" target="_blank" >LM2015073: Nanomaterials and Nanotechnologies for Environment Protection and Sustainable Future</a><br>

Continuities

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

Publication year

2017

Confidentiality

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