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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tsipotan A. S., Gerasimova M. A., Aleksandrovsky A. S., Zharkov S. M., Slabko V. V.
Заглавие : Effect of visible and UV irradiation on the aggregation stability of CdTe quantum dots
Место публикации : J. Nanopart. Res.: Springer, 2016. - Vol. 18, Is. 11. - P.324-8. - ISSN 13880764 (ISSN), DOI 10.1007/s11051-016-3638-0
Примечания : Cited References: 23
Ключевые слова (''Своб.индексиров.''): nanotechnology--quantum dots--photostimulated aggregation--photostability--colloids--laser-induced self-assembly
Аннотация: The possibility of controlling the aggregation stability of CdTe quantum dots (QDs) stabilized by thioglycolic acid (TGA) is important for implementation of quasi-resonant laser-induced self-assembly. This study examines the influence of irradiation by the UV as well as by the visible light on the photostimulated aggregation of QDs. Different photochemical mechanisms are identified, depending on whether light wavelength falls into an interband transition or the first exciton transition. Irradiation by visible light does not lead to changes in the absorption spectra but decreases luminescence intensity through the detachment of TGA and the formation of dangling bonds, leading to the creation of radiativeless relaxation centers. UV irradiation (in the 300–370 nm range), at an intensity of 0.4 W/cm2, initially (during the first 75 min) leads to the degradation of the stabilizer and QDs’ surface. After 75 min of combined UV and visible light irradiation, a gradual increase in spontaneous aggregation takes place, testifying excessive decrease in stabilizing potential barrier height. Hence, the laser-induced self-assembly of CdTe QDs is recommended to be performed over a time period of between 80 and 100 min after the beginning of low-intensity UV irradiation under conditions equivalent to those applied in this study. © 2016, Springer Science+Business Media Dordrecht.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tsipotan, Aleksey S., Gerasimova M. A., Polyutov, Sergey P., Aleksandrovsky A. S., Slabko, Vitaliy V.
Заглавие : Comparative analysis of methods for enhancement of the photostability of CdTe@TGA QD colloid solutions
Коллективы : RFBR; Government of Krasnoyarsk Territory of SB RAS Program [16-42-240410r_a, 0356-2015-0412, II.2P]; Ministry of Education and Science of the Russian Federation [3.6341.2017/VU]
Место публикации : J. Phys. Chem. B: American Chemical Society, 2017. - Vol. 121, Is. 23. - P.5876-5881. - ISSN 1520-6106, DOI 10.1021/acs.jpcb.7b03166
Примечания : Cited References:41. - This research was supported by RFBR and Government of Krasnoyarsk Territory by Research Project No. 16-42-240410r_a and by Project No. 0356-2015-0412 of SB RAS Program No. II.2P. V.V.S. is grateful for the support from the Ministry of Education and Science of the Russian Federation (Grant No. 3.6341.2017/VU).
Предметные рубрики: BOVINE SERUM-ALBUMIN
SENSITIZED SOLAR-CELLS
QUANTUM DOTS
Аннотация: The employment of colloid quantum dots in a number of applications is limited by their instability under light irradiation. Additional methods of photostability enhancement of UV+visible-irradiated TGA-stabilized CdTe quantum dots are investigated. Photostability enhancement was observed via either addition of sodium sulphite in the role of chemical oxygen absorber or addition of 1% gelatin, or, finally, by additional stabilization by bovine serum albumine (BSA). The latter method is the most promising, since it not only enhances the quantum dots' photostability but also makes them more biocompatible and extends the possibilities of their biological applications.
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