The influence of phthalocyanine aggregation in complexes with CdSe/ZnS quantum dots on the photophysical properties of the complexes

Орлова, А. О.; Маслов, В. Г.; Fedorov, Anatoly V.; Berwick, Kevin; Баранов, А. В.

doi:10.3762/bjnano.7.94

Cited by 13 publications

(10 citation statements)

References 43 publications

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“…It should be noted that the shape and position of the Ce6 first absorption band and PL peak corresponded to that of the Ce6 monomers bonded to the ZnS:Mn QDs. A similar picture was observed in hybrid nanostructures with CdSe/ZnS QDs and Al–sulfopthalocianine molecules because of the formation of nonluminescent molecules aggregates . It should be pointed out that absorption spectra of the samples concerned (see Figure ) include only patterns of dimeric and monomeric forms of Ce6 but no new absorption bands that could be attributed to nonluminescent Ce6 aggregates.…”

Section: Resultssupporting

confidence: 65%

“…A similar picture was observed in hybrid nanostructures with CdSe/ZnS QDs and Al−sulfopthalocianine molecules because of the formation of nonluminescent molecules aggregates. 55 It should be pointed out that absorption spectra of the samples concerned (see Figure 4) include only patterns of dimeric and monomeric forms of Ce6 but no new absorption bands that could be attributed to nonluminescent Ce6 aggregates. Chiral Properties of ZnS:Mn QD/Ce6 Hybrid Nanostructures.…”

Section: ■ Resultsmentioning

confidence: 95%

“…We have also analyzed PL excitation (PLE) spectra of the samples presented in Figure 6, in order to estimate the efficiency of FRET, which confirms QD/Ce6 nanostructure formation in solution. 11,12,16,28,30 The FRET model 55 for QDs-based hybrid nanostructures was used to estimate energy transfer efficiency in the samples. The analysis of PL properties of the QDs/Ce6 hybrid nanostructures, i.e.…”

Section: ■ Resultsmentioning

confidence: 99%

“…The FRET model for QDs-based hybrid nanostructures was used to estimate energy transfer efficiency in the samples. The analysis of PL properties of the QDs/Ce6 hybrid nanostructures, i.e.…”

Section: Resultsmentioning

confidence: 99%

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Circular Dichroism Spectroscopy as a Powerful Tool for Unraveling Assembly of Chiral Nonluminescent Aggregates of Photosensitizer Molecules on Nanoparticle Surfaces

et al. 2019

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Recent developments in nanoscience and nanotechnology significantly help improve the properties of traditional materials. A striking example of this is the formation of hybrid nanostructures based on nanoparticles and photosensitizer molecules, the potential range of applications of which extends from photovoltaics to biomedicine. However, the creation of new and effective hybrid nanomaterials of this form inevitably entails new challenges, one of which is a common and critical problem of aggregation of both nanoparticles and photosensitizer molecules. Therefore, a fundamental challenge is to determine the presence of these aggregates, which will produce a significant step toward creating a new generation of materials and devices of broad-spectrum applicability. Here we report on the key role of circular dichroism spectroscopy as a tool to detect the formation of nonluminescent aggregates of chlorin e6, a second-generation photosensitizer, in a hybrid nanostructure with ZnS:Mn quantum dots. These aggregates are active acceptors of photoexcitation energy from quantum dots and limit the photophysical properties of the whole nanostructure. It has been established that circular dichroism spectroscopy reveals the presence of nonluminescent molecule aggregates at chlorin e6 concentrations of ∼10 −6 mol/L, which compares very favorably to absorption spectroscopy which does not show any direct indications of aggregation up to ∼10 −5 mol/L. This result demonstrates the promise and importance of using circular dichroism spectroscopy in the study of organic/inorganic hybrid nanostructures.

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Section: Resultssupporting

confidence: 65%

Section: ■ Resultsmentioning

confidence: 95%

Section: ■ Resultsmentioning

confidence: 99%

“…The FRET model for QDs-based hybrid nanostructures was used to estimate energy transfer efficiency in the samples. The analysis of PL properties of the QDs/Ce6 hybrid nanostructures, i.e.…”

Section: Resultsmentioning

confidence: 99%

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Circular Dichroism Spectroscopy as a Powerful Tool for Unraveling Assembly of Chiral Nonluminescent Aggregates of Photosensitizer Molecules on Nanoparticle Surfaces

et al. 2019

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“…Non-luminescent TPP aggregates can be efficient acceptors of energy and they can quench both phosphors in our system, i.e., QDs and TPP monomers. 57 The efficiency of SO generation by QDs-TPP nanocomposite and free TPP with the same TPP concentration in CS solution has been analyzed to study if the nanocomposites can generate the SO aer their incorporation in chitosan biopolymer.…”

Section: Resultsmentioning

confidence: 99%

Chitosan nanocomposites with CdSe/ZnS quantum dots and porphyrin

et al. 2022

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Photoinduced Toxicity Caused by Gold Nanozymes and Photodynamic Dye Encapsulated in Submicron Polymer Shell

Sergeev,

Maksimova,

Moiseeva

et al. 2024

Part & Part Syst Charact

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The development of nanozymes, artificial enzymes made from inorganic nanoparticles, is widely studied due to their affordability, durability, and strength. Gold nanoparticles (AuNPs) are employed to imitate peroxidase, glucose oxidase, lactate oxidase, superoxide dismutase, and catalase. The last one transforms intracellular hydrogen peroxide into molecular oxygen, whose deficiency is characteristic of the hypoxic tumor microenvironment. Thus, gold nanoparticles are thought to enhance the overall effectiveness of photodynamic therapy. However, the enzyme‐like activity of nanoparticles rapidly decreases in biological media, due to the aggregation and formation of the so‐called “protein corona”. In this study, polymeric submicrocapsules loaded with AuNPs and a photodynamic dye are fabricated via Layer‐by‐Layer (LbL) assembly. The enhancement of photodynamic treatment efficacy by in situ production of oxygen by the catalase‐like effect of AuNPs is investigated. Polymeric capsules are thoroughly characterized in terms of physicochemical and catalytic properties, and as a proof of concept, their therapeutic potential is evaluated in vitro. Furthermore, encapsulated AuNPs shows significantly lower aggregation both upon storage and during the reaction course. The results shows that the polymer capsules, containing AuNPs and photodynamic dye, show significantly higher light‐induced cytotoxicity in comparison to the individual photodynamic dye, suggesting a synergistic effect between the formation of molecular oxygen by catalase‐like gold nanozymes and photodynamic action.

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The influence of phthalocyanine aggregation in complexes with CdSe/ZnS quantum dots on the photophysical properties of the complexes

Cited by 13 publications

References 43 publications

Circular Dichroism Spectroscopy as a Powerful Tool for Unraveling Assembly of Chiral Nonluminescent Aggregates of Photosensitizer Molecules on Nanoparticle Surfaces

Circular Dichroism Spectroscopy as a Powerful Tool for Unraveling Assembly of Chiral Nonluminescent Aggregates of Photosensitizer Molecules on Nanoparticle Surfaces

Chitosan nanocomposites with CdSe/ZnS quantum dots and porphyrin

Photoinduced Toxicity Caused by Gold Nanozymes and Photodynamic Dye Encapsulated in Submicron Polymer Shell

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