Mr. Alexander S. Moshkov Profile

Alexander S. Moshkov

at Saratov State Univ

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Publications (2)

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Proceedings Article | 29 April 2022 Paper

Hydrophilization parameters influencing the properties of shelled alloyed QDs

Alexander Moshkov, Svetlana Mescheryakova, Pavel Strokin, Daniil Drozd, Irina Yu. Goryacheva, Olga Goryacheva

Proceedings Volume 12194, 121941A (2022) https://doi.org/10.1117/12.2626340

KEYWORDS: Luminescence, Quantum efficiency, Nanoparticles, Absorbance, Quantum dots, Nanocrystals, Semiconductors

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Quantum dots (QDs) are modern nanoparticles with a wide potential for use in medicine, bioanalysis, as well as in optics and energetics. Different types of QDs can be produced depending on their synthesis method. QDs formed by semiconductor components able to mutual solid-solution formation named alloyed. This type of QDs has a high quantum yield and narrow emission peak but less chemical stability relative to core-shell type QDs. Better core-shell QDs stability explains by the additional surface shell covering. This approach can be applied to the alloyed QDs also. One-step hightemperature organometallic procedure is excellent in this regard due to its simplicity and consistency in the synthesis. However, QDs which obtained in this way are hydrophobic and do not dissolve in polar solutions such as water. Hydrophilization is used to convert QDs from a hydrophobic to a hydrophilic state. It was found that when hydrophilizing with β-mercaptoethanol, the quantum yield (QY) significantly increases, although when hydrophilizing with other ligands, it is just a decrease in the quantum yield that appears. This article investigates the process of hydrophilization of core-shell alloyed QDs in which an increase in QY is observed. For this, the effect on the optical properties of the amount of the hydrophilizing agent, long-term storage at room and low temperatures, and the effect of pH on hydrophilized QDs are considered.

Proceedings Article | 4 May 2021 Paper

2-mercaptoethanol and dihydrolipoic acid biligand-coated alloyed quantum dots

Pavel Strokin, Daniil Drozd, Daria Tsyupka, Alexander Moshkov, Irina Yu. Goryacheva

Proceedings Volume 11845, 1184517 (2021) https://doi.org/10.1117/12.2590834

Read Abstract +

Alloyed quantum dots (QDs) are luminescent semiconductor nanocrystals, which are promising materials in various fields of science and technology, including in bioanalysis. The key requirement for alloyed QDs in polar solutions analysis is hydrophilicity. The modification with dihydrolipoic acid (DHLA) makes it possible to increase the alloyed QDs colloidal stability in a polar medium while retaining the advantages of nanoparticles of this structure, and also allows further electrostatic self-assembly of alloyed QDs with antibodies. The article describes the DHLA-modification of the alloyed QDs composition Cd_xZn_1-xSe_yS_1-y / ZnS using 2-mercaptoethanol (BME) as an additional hydrophilizing agent. The effect of hydrophilization conditions on the following modified properties alloyed QDs was studied: photoluminescence quantum yield (PLQY), width peak at half maximum (FWHM), luminescence peak position, colloidal stability during long-term storage. The search for the optimal ratio of hydrophilizing agents DHLA:BME was carried out, at which the advantages of the biligand shell would be maximally realized. The methods presented in this work make it possible to obtain alloyed QDs with a high PLQY (about 65%) and a long stability period (more than 3 months).

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