Structural and optical properties of solid-phase singlet oxygen photosensitizers based on fullerene aqueous suspensions

Белоусова, И. М.; Belousov, V. P.; Киселев, В. М.; Murav'eva, T. D.; Kislyakov, I. M.; Сироткин, А. К.; Starodubtsev, A. M.; Kris’ko, T. K.; Багров, И. В.; Ermakov, А. V.

doi:10.1134/s0030400x08110118

Cited by 14 publications

(8 citation statements)

References 32 publications

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“…fullerenes, nanotubes and graphene [3][4][5]. The photosensitizing abilities of those carbon allotropes have been studied mainly in the bulk, though it has been demonstrated that fullerenes and carbon nanotubes, when deposited from the solution with polystyrene used to increase the adhesion with the solid support are able to generate singlet oxygen molecule upon illumination [6][7][8]. The yield of singlet oxygen photogeneration by C60 molecule is very high, but its practical use is limited, since it absorbs mainly in UV region.…”

Section: Introductionmentioning

confidence: 99%

Formation of poly(Azure A)-C60 photoactive layer as a novel approach in the heterogeneous photogeneration of singlet oxygen

Blacha–Grzechnik

Piwowar

Zdyb

et al. 2018

Applied Surface Science

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Fullerene, C60 photosensitizer was incorporated into poly(Azure A) in the process of electrochemical polymerization from the solution of corresponding dye and fullerene. The synthesized organic layer (PAA_C60/ITO) was characterized by means of cyclic voltammetry, UV-Vis, Raman and X-ray photoelectron spectroscopies. It was shown that PAA_C60/ITO exhibits strong absorption in both UV and Vis regions and that both immobilized photosensitizers, i.e. Azure A and C60, retain their photochemical activity towards 1 O2 generation under illumination as tested with 2,3,4,5-tetraphenylcyclopentadienone (TPCPD) singlet oxygen quencher. The electrodeposited photoactive layer composed of two photosensitizers was investigated as a source of 1 O2 in the process of α-terpinene oxidation.

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Section: Introductionmentioning

confidence: 99%

Formation of poly(Azure A)-C60 photoactive layer as a novel approach in the heterogeneous photogeneration of singlet oxygen

Blacha–Grzechnik

Piwowar

Zdyb

et al. 2018

Applied Surface Science

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“…increasing the degree of defectiveness of the fullerene aggregate structure [15]. Attempting to have a large RSA effect we produced our fullerene dispersion by method [16] which provides a high amorphization of fullerene aggregate structure (70% according to X-ray diffraction analysis of the freeze-dried dispersion [17]). So the contribution of RSA effect in total nonlinear optical limiting for visible light is expected to be considerable.…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Белоусова

Videnichev

Kislyakov

et al. 2014

Opt. Mater. Express

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Optical limiting properties of natural carbon nanoparticles (Shungite carbon) and fullerene aggregates in aqueous dispersions were for the first time studied and juxtaposed. For the picosecond laser pulses both dispersions exhibited comparable optical limiting property, apparently due to nonlinear absorption (mainly TPA). In the domain of the nanosecond laser pulses, nonlinear scattering NLS is thought to be main optical limiting mechanism in the dispersions under study. Shungite carbon dispersion showed stronger optical limiting (being similar to CBS) in visible and IR, which we ascribe to its structure more favorable to the thermal relaxation processes responsible for the NLS mechanism.

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“…Heterogeneous n C 60 suspensions have UV–vis spectra that differ from those of C 60 -organic solutions. Their spectra exhibit spectroscopic properties dependent upon particle size, particle concentration, preparation method, and solution chemistry. ,− For instance, aq/ n C 60 , produced in water via extended mixing, has red-shifted absorption bands relative to C 60 in toluene and n -hexane and there are quantifiable changes in relative absorbance that occur with an increase in average particle size . Because of the complicated effects of concentration and particle size on the UV–vis spectra of n C 60 it is potentially challenging to directly compare the absorption spectrum of one n C 60 suspension to another.…”

Section: Introductionmentioning

confidence: 99%

Uncontrolled Variability in the Extinction Spectra of C₆₀ Nanoparticle Suspensions

Chang

Vikesland

2013

Langmuir

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To properly investigate the environmental transport, fate, and impact of fullerene C60 nanoparticles (nC60), it is necessary to reproducibly obtain nC60 suspensions and to accurately determine their concentration ([C60]). The results in the present study, however, clearly illustrate that the production of nC60 via extended mixing and via sonication are highly stochastic top-down processes subject to widely divergent end points. nC60 suspensions exhibit variable characteristics (e.g., [C60], average particle size, size distribution, etc.) that make it challenging, if not impossible, to acquire reproducible UV-vis extinction spectra. The mass extinction coefficient, which is the absorptivity of a suspension with [C60] = 1 mM obtained by normalizing UV-vis spectra by the mass concentration of C60 in the suspension, decreases with a given suspension's hydrodynamic diameter, whereas the particle extinction coefficient, which is the absorptivity of a suspension containing one mole of nC60 nanoparticles with the same size distribution as the target suspension and calculated based upon the suspension nanoparticle size distribution, increases with its number weighted average diameter. Other spectroscopic properties of nC60 (e.g., absorbance bandwidth, position of absorption maximum, and relative extinction intensity) also change with average particle size. As a result of the extant variability between samples, when UV-vis spectra are employed to calculate or represent [C60] for fullerene nanoparticle suspensions, extreme care must be taken and other colloidal properties of this suspension must be measured to obtain an accurate result.

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Structural and optical properties of solid-phase singlet oxygen photosensitizers based on fullerene aqueous suspensions

Cited by 14 publications

References 32 publications

Formation of poly(Azure A)-C60 photoactive layer as a novel approach in the heterogeneous photogeneration of singlet oxygen

Formation of poly(Azure A)-C60 photoactive layer as a novel approach in the heterogeneous photogeneration of singlet oxygen

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Uncontrolled Variability in the Extinction Spectra of C₆₀ Nanoparticle Suspensions

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Structural and optical properties of solid-phase singlet oxygen photosensitizers based on fullerene aqueous suspensions

Cited by 14 publications

References 32 publications

Formation of poly(Azure A)-C60 photoactive layer as a novel approach in the heterogeneous photogeneration of singlet oxygen

Formation of poly(Azure A)-C60 photoactive layer as a novel approach in the heterogeneous photogeneration of singlet oxygen

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Uncontrolled Variability in the Extinction Spectra of C60 Nanoparticle Suspensions

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Product

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Uncontrolled Variability in the Extinction Spectra of C₆₀ Nanoparticle Suspensions