GaP based structures with luminescent nanoparticles for biophotonics and photosensors systems

Abstract

Systems based on GaP whisker nanocrystals (NWs) and luminescent nanoparticles have been developed for potential application in biophotonics and the creation of a new class of multispectral photosensitive detectors. In the first part of the work, the efficiency of using NWs for cell mechanoporation was studied. In this approach AgInS/ZnS ternary quantum dots (QDs) stabilized with glutathione were used as luminescent labels. To evaluate the more efficient accumulation of nanoparticles in cells, several methods for creating samples were tested. In the first case, HeLa cells were incubated on an array of vertically oriented NWs, and after 24 hours a QD solution was added to the nutrient medium. In the second case, cells were incubated in the presence of NWs with QDs already deposited on the surface. Evaluation of the efficiency of penetration and accumulation of QDs in cells was determined by the luminescent response of quantum dots using confocal laser scanning microscopy. Both methods showed the penetration of QDs into cells, but the first method was proved to be more effective.
In the second part of the work, whisker GaP nanocrystals were used to create hybrid structures with carbon dots (CDs). Such structures have the potential to create multispectral sensitive photodetectors. Studies using confocal luminescent and time-resolved microscopy have shown that the optical properties of CDs themselves are preserved in created hybrid structures. In this case, a decrease in the lifetime of the CDs luminescence relative to the initial solution is observed. The measured impedance spectra of the obtained hybrid structures show a decrease in their resistance under the impact of UV radiation. It can be concluded that, in the NW/CD structures, the transfer of charge carriers from the CDs to the NWs is observed.


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Speaker

Maxim Rider
ITMO University, St. Petersburg
Russia

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