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Your search keyword '"Razumov, V. F."' showing total 319 results
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319 results on '"Razumov, V. F."'

15. Exfoliated Bi2Te3 nanoparticle suspensions and films: morphological and nonlinear optical characterization

Author

Ganeev Rashid A., Popov V. S., Zvyagin A. I., Lavrentyev N. A., Mirofyanchenko A. E., Mirofyanchenko E. V., Shuklov I. A., Ovchinnikov O. V., Ponomarenko V. P., and Razumov V. F.

Subjects
bismuth telluride nanoparticles, nonlinear refraction, reverse saturable absorption, saturable absorption, synthesis, Physics, QC1-999
Abstract

Bismuth telluride nanoparticles (NPs) attract attention due to the growth of sensitivity of the Bi2Te3 NPs-containing registrars in the near- and mid-infrared ranges. We describe the synthesis and characterization of these structures and analyze the low-order nonlinear optical properties of the colloidal suspensions and thin films containing Bi2Te3 NPs using 1064 and 532 nm, 10 ns pulses. Colloidal Bi2Te3 NPs demonstrate saturable absorption and positive nonlinear refraction (saturation intensity 7 × 108 W cm−2, nonlinear absorption coefficient β SA = −7 × 10−8 cm W−1, nonlinear refractive index γ = 9 × 10−12 cm2 W−1), while at stronger excitation by 532 nm, 10 ns pulses the reverse saturable absorption dominates over other nonlinear optical processes. We achieved significant growth of the nonlinear optical parameters of the thin films containing these NPs (film thickness l = 60 nm, β SA = −1.2 × 10−4 cm W−1, γ = 5 × 10−7 cm2 W−1 in the case of 532 nm probe radiation and β = −5 × 10−5 cm W−1, γ = 6 × 10−8 cm2 W−1 in the case of 1064 nm probe radiation) compared with colloidal Bi2Te3 NPs and discuss the observed peculiarities of the nonlinear response of Bi2Te3 nanostructures.

Published
2021
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16. Pump–Probe Spectroscopic Study of Charge Carrier Transport Processes in Films of CsPbBr3 Perovskite Colloidal Quantum Dots.

Author

Galushko, A. A., Lochin, G. A., Pevtsov, D. N., Aibush, A. V., Gostev, F. E., Shelaev, I. V., Nadtochenko, V. A., Brichkin, S. B., and Razumov, V. F.

Subjects
SEMICONDUCTOR nanocrystals, CHARGE carriers, THIN films, LASER spectroscopy, FEMTOSECOND lasers
Abstract

Colloidal quantum dots of CsPbBr3 perovskites have been synthesized. The average size and polydispersity of nanocrystals were determined to be 8.3 nm and 16%, respectively. Thin films were made based on the obtained nanocrystals using drop-casting and spin-coating methods. The charge carrier transport process was studied using the technique of femtosecond laser pump–probe spectroscopy. An interpretation of the shift in the bleaching peak as a function of time is proposed. The mobility of charge carriers in films has been estimated using the Einstein–Smoluchowski equation. [ABSTRACT FROM AUTHOR]

Published
2024
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29. PHOTOSENSITIVITY OF PbS COLLOIDAL QUANTUM DOTS BASED NANOSTRUCTURES WITH AN ENERGY BARRIER

Author

Popov, V. S., primary, Ponomarenko, V. P., additional, Dymkin, D. V., additional, Shuklov, I. A., additional, Gadomska, A. V., additional, Brichkin, S. B., additional, Lavrentiev, N. A., additional, Gak, V. U., additional, Mirofyanchenko, A. E., additional, Mirofyanchenko, E. V., additional, Katsaba, A. V., additional, Arsenov, P. V., additional, Ivanov, V. V., additional, and Razumov, V. F., additional

Published
2023
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30. Investigation of Ligand Exchange in Thin Films of PbS Colloidal Quantum Dots with FTIR-Spectroscopy.

Author

Shuklov, I. A., Dyomkin, D. V., Konavicheva, V. A., Popov, V. S., and Razumov, V. F.

Subjects
SEMICONDUCTOR nanocrystals, THIN films, ATTENUATED total reflectance, LEAD sulfide, FOURIER transform infrared spectroscopy, QUANTUM dots, RESONANT tunneling, SOLVENTS
Abstract

To optimize photosensitive structures based on colloidal lead sulfide quantum dots, the rate and completeness of replacement in thin layers was studied using Fourier transform infrared spectroscopy on a multiple attenuated total internal reflection attachment. The rate of ligand replacement in a thin layer of colloidal lead sulfide quantum dots when replaced by iodide ion in different solvents was studied for the first time. A change in the composition of the shells of PbS nanoparticles under the influence of a number of solvents and when replacing them with thiocyanate ions was shown. For the first time, the replacement of the oleate ligand shell with pure formamide has been established. [ABSTRACT FROM AUTHOR]

Published
2023
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