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Fronya, Anastasiya A.; Antonenko, Sergey V.; Kharin, Alexander Yu; Muratov, Andrei V.; Aleschenko, Yury A.; Derzhavin, Sergey I.; Karpov, Nikita V.; Dombrovska, Yaroslava I.; Garmash, Alexander A.; Kargin, Nikolay I.; Klimentov, Sergey M.; Timoshenko, Victor Yu; Kabashin, Andrei V.
Molecules (Basel, Switzerland), 01/2020, Letnik: 25, Številka: 3Journal Article
Using 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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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