Nonlinear absorption enhancement of Methylene Blue in the presence of Au/SiO2 core/shell nanoparticles

Ovchinnikov, O. V.; Chevychelova, T. A.; Zvyagin, A. I.; Selyukov, A. S.

doi:10.1016/j.dyepig.2021.109829

Cited by 11 publications

(2 citation statements)

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“…36 Ovchinnikov et al experimentally observed the nonlinear absorption enhancement of methylene blue based on the plasmonic coupling of Au/SiO 2 core-shell nanoparticles. 37 Furthermore, many studies have proven that nonlinear plasmonic effects are more likely to induce robust electric field enhancement. [38][39][40] These studies demonstrate the feasibility and prospect of applying the plasmonic-enhanced two-photon absorption (PETPA) method to solar cells, where the TPA properties of photoactive materials may be strongly enhanced though nonlinear plexcitons.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear plexcitons: excitons coupled with plasmons in two-photon absorption

2022

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Section: Introductionmentioning

confidence: 99%

Nonlinear plexcitons: excitons coupled with plasmons in two-photon absorption

2022

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“…Separately, it should be noted that one of the most promising areas of research related to iron-containing oxide materials is the creation of core-shell nanostructures or complex nanocomposites [ 19 , 20 , 21 , 22 ]. As can be seen from the analysis of publication activity, interest in these types of nanomaterials is increasing every year.…”

Section: Introductionmentioning

confidence: 99%

Study of Phase Transformations and Hyperfine Interactions in Fe3O4 and Fe3O4@Au Nanoparticles

et al. 2022

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The paper presents the results of a study of iron oxide nanoparticles obtained by chemical coprecipitation, coated (Fe3O4@Au) and not coated (Fe3O4) with gold, which were subjected to thermal annealing. To characterize the nanoparticles under study, scanning and transmission electron microscopy, X-ray diffraction, and Mössbauer spectroscopy on 57Fe nuclei were used, the combination of which made it possible to establish a sequence of phase transformations, changes in morphological and structural characteristics, as well as parameters of hyperfine interactions. During the studies, it was found that thermal annealing of nanoparticles leads to phase transformation processes in the following sequence: nonstoichiometric magnetite (Fe3-γO4) → maghemite (γ-Fe2O3) → hematite (α-Fe2O3), followed by structural ordering and coarsening of nanoparticles. It is shown that nanoparticles of nonstoichiometric magnetite with and without gold coating are in the superparamagnetic state with a slow relaxation rate. The magnetic anisotropy energy of nonstoichiometric magnetite is determined as a function of the annealing temperature. An estimate was made of the average size of the region of magnetic ordering of Fe atoms in nonstoichiometric magnetite, which is in good agreement with the data on the average sizes of nanoparticles determined by scanning electron microscopy.

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