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Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures

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dc.contributor.authorMuratov, A. V.
dc.contributor.authorFronya, A. A.
dc.contributor.authorAntonenko, S. V.
dc.contributor.authorKharin, A. Y.
dc.contributor.authorAleshchenko, Y. A.
dc.contributor.authorDerzhavin, S. I.
dc.contributor.authorKarpov, N. V.
dc.contributor.authorDombrovska, Y. I.
dc.contributor.authorGarmash, A. A.
dc.contributor.authorKargin, N. I.
dc.contributor.authorKlimentov, S. M.
dc.contributor.authorTimoshenko, V. Y.
dc.contributor.authorKabashin, A. V.
dc.contributor.authorФроня, Анастасия Андреевна
dc.contributor.authorАнтоненко, Сергей Васильевич
dc.contributor.authorАлещенко, Юрий Анатольевич
dc.contributor.authorГармаш, Александр Александрович
dc.contributor.authorКаргин, Николай Иванович
dc.contributor.authorКлиментов, Сергей Михайлович
dc.contributor.authorТимошенко, Виктор Юрьевич
dc.contributor.authorКабашин, Андрей Викторович
dc.date.accessioned2024-11-25T15:37:02Z
dc.date.available2024-11-25T15:37:02Z
dc.date.issued2020
dc.description.abstractUsing methods of pulsed laser ablation from a silicon target in helium (He)-nitrogen (N2) gas mixtures maintained at reduced pressures (0.5-5 Torr), we fabricated substrate-supported silicon (Si) nanocrystal-based films exhibiting a strong photoluminescence (PL) emission, which depended on the He/N2 ratio. We show that, in the case of ablation in pure He gas, Si nanocrystals exhibit PL bands centered in the "red - near infrared" (maximum at 760 nm) and "green" (centered at 550 nm) spectral regions, which can be attributed to quantum-confined excitonic states in small Si nanocrystals and to local electronic states in amorphous silicon suboxide (a-SiOx) coating, respectively, while the addition of N2 leads to the generation of an intense "green-yellow" PL band centered at 580 nm. The origin of the latter band is attributed to a radiative recombination in amorphous oxynitride (a-SiNxOy) coating of Si nanocrystals. PL transients of Si nanocrystals with SiOx and a-SiNxOy coatings demonstrate nonexponential decays in the micro- and submicrosecond time scales with rates depending on nitrogen content in the mixture. After milling by ultrasound and dispersing in water, Si nanocrystals can be used as efficient non-toxic markers for bioimaging, while the observed spectral tailoring effect makes possible an adjustment of the PL emission of such markers to a concrete bioimaging task.
dc.identifier.citationTailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures / Muratov, A.V. [et al.] // Molecules. - 2020. - 25. - № 3. - 10.3390/molecules25030440
dc.identifier.doi10.3390/molecules25030440
dc.identifier.urihttps://www.doi.org/10.3390/molecules25030440
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85078299142&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000515384800010
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/20146
dc.relation.ispartofMolecules
dc.titleTailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue3
oaire.citation.volume25
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