PHOTOLUMINESCENT NANOMATERIALS FOR THERMOMETRY: SILICON AND CARBON NANOPARTICLES
| Autor: | Vladyslav V. Lisnyak, Alexander N. Zaderko, G.K. Mussabek, G.K. Sadykov, S. Z. Baktygerey |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | SERIES PHYSICO-MATHEMATICAL. 5:54-60 |
| ISSN: | 2518-1726 1991-346X |
| DOI: | 10.32014/2021.2518-1726.84 |
| Popis: | The article describes the features of photoluminescence (PL) of silicon and carbon nanocolloids prepared by us using known approaches. In the course of the study, Si and C nanoparticles (NPs) were dispersed in non-polar and polar liquids, respectively, in order to study their photoluminescent properties as a function of temperature. For a number of samples, a bathochromic shift in the position of the PL maximum was observed, as well as a change in the PL intensity depending on the solvent and temperature. The latter opens up prospects for applications of PL thermometry, for example, for mapping the temperature distribution. We calculated the temperature coefficients of changes in the PL intensity as a function of temperature, and in addition, we found that the relatively important temperature sensitivity is associated not only with the internal properties of Si NPs and C NPs, but also, to a large extent, with the mechanisms of the Forster resonant energy transfer in non-polar liquids. The latter is probably realized between particles of different sizes and significantly depends on the change in the viscosity of the liquid with decreasing temperature, which prevents the chaotic movement of NPs and their aggregates in the solution. Presumably, the resonant transfer of Forster energy between Si particles can be the reason that then interactions at short distances between particles of different sizes are possible, in the cases when the NP size distribution is relatively large. Therefore, based on the foregoing, the main directions for improvement should be the development of unified Si NPs and C NPs to clarify the recorded effect and increase the sensitivity in luminescence thermometry using the required type of colloidal solutions and solvent for the respective NPs. The information presented in the article is of interest since it forms the basis for understanding the observed effects during the analysis of experimental data using the available literature sources. |
| Databáze: | OpenAIRE |
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