Influence of Solvent Electron Affinity on Paramagnetic Defects in Hybrid Si/SiOx Luminescent Nanoparticles Full article
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Journal of Nanoparticle Research
ISSN: 1388-0764 , E-ISSN: 1572-896X |
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Output data | Year: 2019, Volume: 21, Number: 6, Article number : 127, Pages count : 11 DOI: 10.1007/s11051-019-4575-5 | ||||||||||
Tags | Defects; DFT calculations; EPR spectroscopy; Luminescent nanoparticles; Silicon | ||||||||||
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Abstract:
Luminescence of 1-octadecene-coated silicon nanoparticles with 8 nm crystalline core in hexane and CCl4 colloidal solutions and its reversible photobleaching were examined. In agreement with previous reports, anti-correlation of luminescence intensity and the number of paramagnetic defects were found in hexane. Luminescence intensity is decreased by 75% during 30 min of 405 nm laser irradiation while the number of paramagnetic defects is increased by 65%. Paramagnetic defects were supposed to be silicon dangling bonds. In CCl4 colloidal solution, this correlation is lost: photobleaching is similar to hexane colloidal solution, while the number of paramagnetic defects is not changed during irradiation. Electron trapping and subsequent breaking of weak Si-Si bonds are proposed to be the reason of formation of silicon dangling bonds during irradiation. DFT calculation of geometry and g-tensor of Si-vacancy on the boundary of crystalline silicon core and oxide shell was performed. Formation of paramagnetic defects is supposed to be a by-process responsible only for a minor effect on luminescence intensity. © 2019, Springer Nature B.V.
Cite:
Gromov O.I.
, Feklichev E.D.
, Zhidomirov G.M.
, Rybaltovskii A.O.
, Sviridov A.P.
, Grigoriev Y.V.
, Ischenko A.A.
, Bagratashvili V.N.
, Golubeva E.N.
Influence of Solvent Electron Affinity on Paramagnetic Defects in Hybrid Si/SiOx Luminescent Nanoparticles
Journal of Nanoparticle Research. 2019. V.21. N6. 127 :1-11. DOI: 10.1007/s11051-019-4575-5 WOS Scopus РИНЦ
Influence of Solvent Electron Affinity on Paramagnetic Defects in Hybrid Si/SiOx Luminescent Nanoparticles
Journal of Nanoparticle Research. 2019. V.21. N6. 127 :1-11. DOI: 10.1007/s11051-019-4575-5 WOS Scopus РИНЦ
Dates:
Submitted: | Dec 6, 2018 |
Accepted: | May 29, 2019 |
Published print: | Jun 1, 2019 |
Published online: | Jun 11, 2019 |
Identifiers:
Web of science | WOS:000471199700001 |
Scopus | 2-s2.0-85066971343 |
Elibrary | 41614518 |
Chemical Abstracts | 2019:1159861 |
OpenAlex | W2950770857 |
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