Electron-paramagnetic resonance and photoluminescence study of Si nanocrystals-photosensitizers of singlet oxygen molecules

Константинова, Е. А.; Демин, В. А.; Vorontzov, A.S.; Ryabchikov, Yury V.; Belogorokhov, I. A.; Осминкина, Л. А.; Форш, П. А.; Кашкаров, П. К.; Timoshenko, V. Yu.

doi:10.1016/j.jnoncrysol.2005.12.017

Cited by 26 publications

(15 citation statements)

References 6 publications

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“…The samples were prepared by electrochemical etching of (100)-oriented boron-doped bulk Si wafers with a resistivity of 10-20 Ω·cm in a solution of hydrofluoric acid [3,4]. The etching current density was 20÷100 mA/cm 2 .…”

Section: Methodsmentioning

confidence: 99%

EPR and photoluminescence diagnostics of singlet oxygen generation on porous silicon surface

Константинова

Демин

Ryabchikov

et al. 2009

Phys. Status Solidi (c)

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Electron paramagnetic resonance and photoluminescence spectroscopy are used to investigate photosensitized generation of singlet oxygen in the porous silicon layers. The singlet oxygen concentration in the samples was estimated at various oxygen pressures. The time of energy transfer from excitons confined in Si nanocrystals to adsorbed O2 molecules on silicon nanocrystal surface and photosensitization efficiency are found to depend on the porosity of the samples. The singlet oxygen generation efficiency increases strongly for porous silicon with high (>80%) porosity. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Methodsmentioning

confidence: 99%

EPR and photoluminescence diagnostics of singlet oxygen generation on porous silicon surface

Константинова

Демин

Ryabchikov

et al. 2009

Phys. Status Solidi (c)

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“…This fact implies that nc-Si can be considered as a potential photosensitizer of (1) O2 in liquids, including aqueous media [70,71]. Beside the PL diagnostics of the nc-Si-induced photosensitization the EPR technique was shown to be efficient for the quantitative analysis of the (1) O2 photosensitization [84]. It is known that por-Si possesses intrinsic defects as Si DBs, which can act as spin labels for (1) O2.…”

Section: Appl Sci 2020 10 X For Peer Review 31 Of 47mentioning

confidence: 99%

“…Measurements were done at high microwave power of about 200 mW. (Reprinted from Reference[84] with permission from Elsevier).…”

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confidence: 99%

Spin-Dependent Phenomena in Semiconductor Micro-and Nanoparticles—From Fundamentals to Applications

Fomin

Timoshenko

2020

Applied Sciences

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The present overview of spin-dependent phenomena in nonmagnetic semiconductor microparticles (MPs) and nanoparticles (NPs) with interacting nuclear and electron spins is aimed at covering a gap between the basic properties of spin behavior in solid-state systems and a tremendous growth of the experimental results on biomedical applications of those particles. The first part of the review represents modern achievements of spin-dependent phenomena in the bulk semiconductors from the theory of optical spin orientation under indirect optical injection of carriers and spins in the bulk crystalline silicon (c-Si)—via numerous insightful findings in the realm of characterization and control through the spin polarization—to the design and verification of nuclear spin hyperpolarization in semiconductor MPs and NPs for magnetic resonance imaging (MRI) diagnostics. The second part of the review is focused on the electron spin-dependent phenomena in Si-based nanostructures, including the photosensitized generation of singlet oxygen in porous Si and design of Si NPs with unpaired electron spins as prospective contrast agents in MRI. The experimental results are analyzed by considering both the quantum mechanical approach and several phenomenological models for the spin behavior in semiconductor/molecular systems. Advancements and perspectives of the biomedical applications of spin-dependent properties of Si NPs for diagnostics and therapy of cancer are discussed.

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“…Low‐dimensional silicon nanostructures (nano‐Si) are a promising material for any applications due to their unique structural and optoelectronic properties . They are already employed for a wide range of applications such as bioimaging and drug delivery, nanothermometry, sensing, magneto‐resonance imaging (MRI), and positron‐emission tomography (PET), singlet oxygen generation, or creation of fluorescent biolabels . However, a problem of material toxicity arises due to contamination by chemical precursors used for nanomaterials synthesis significantly restricting their bioapplications.…”

Section: Introductionmentioning

confidence: 99%

Size Modification of Optically Active Contamination‐Free Silicon Nanoparticles with Paramagnetic Defects by Their Fast Synthesis and Dissolution

Ryabchikov

2018

Physica Status Solidi (a)

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Contamination-free silicon-based nanoparticles (NPs) with several modalities are developed in this work. They are formed by non-toxic laser-assisted decomposition of silicon microgranules homogeneously dispersed in deionized water. Precise control of numerous experimental parameters allows repeatable fine tuning of nanoparticle size solving significant lacks of a direct laser ablation routine. Such a method provokes a huge amount of paramagnetic defect states of optically active silicon NPs that can serve as a contrast agent for magnetic resonance and nonlinear optical imaging. Perspectives of their bioapplication are driven by detected their fast size degradation in a NaCl-based medium.

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Electron-paramagnetic resonance and photoluminescence study of Si nanocrystals-photosensitizers of singlet oxygen molecules

Cited by 26 publications

References 6 publications

EPR and photoluminescence diagnostics of singlet oxygen generation on porous silicon surface

EPR and photoluminescence diagnostics of singlet oxygen generation on porous silicon surface

Spin-Dependent Phenomena in Semiconductor Micro-and Nanoparticles—From Fundamentals to Applications

Size Modification of Optically Active Contamination‐Free Silicon Nanoparticles with Paramagnetic Defects by Their Fast Synthesis and Dissolution

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