Pre-defense presentations of two PhD theses from ITMO University held in LNBE

LNBE extends its cooperation with ITMO University (St. Petersburg National Research University of Information Technologies, Mechanics and Optics, St. Petersburg, Russia). On October 15, two researchers from this university presented their PhD theses at an LNBE seminar for their preliminary assessment before the defense. Professor Igor Nabiev, leading researcher of LNBE, has agreed to be the formal opponent at the defense of the first thesis; NRNU MEPhI will be the supervising institution at the defense of the other one.

The PhD thesis in Optics by A. P. Litvin, entitled Non-Radiative Photoexcitation Energy Transfer in Systems of Nanocrystals Based on Lead Chalcogenides, has been prepared under the direction of Alexander V. Baranov, DSc.

The experimental data presented in the thesis are important for designing novel sources and receivers of IR radiation, engineering of IR-nanophotonic devices based on semiconductor nanocrystals, and enhancement of solar cell efficiency.

The PhD thesis on Study of the Luminescent Properties of Complexes of Semiconductor Quantum Dots and Tetrapyrrole Compounds by Irina Martynenko deals with the engineering of hybrid structures with unique characteristics resulting from the combination of the properties of semiconductor nanoparticles and organic molecules.

Owing to unique optical properties of quantum dots, such as high light-absorption capacity and luminescence quantum yield, they can serve as energy donors in complexes with organic molecules. On the other hand, tetrapyrrole molecules combine the capacities for generating singlet oxygen and accumulating in pathologically altered tissues. Tetrapyrroles are widely used in diagnosis and treatment of malignant tumors.

The use of quantum dots as energy donors in complexes with tetrapyrrole molecules substantially extends the spectral range of the excitation radiation for tetrapyrroles, and effective photoexcitation energy transfer via the Förster resonance energy transfer (FRET) mechanism considerably enhances the efficiency of singlet oxygen generation. In addition, quantum dots can serve as agents for targeted delivery by increasing the penetrability of the photosensitizer molecules into cells.

Contact:

Prof. Igor Nabiev, PhD, DSc, leading scientist (igor.nabiev@gmail.com)

Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute
31 Kashirskoe shosse, 115409 Moscow, Russian Federation

http://www.lnbe.mephi.ru/en

 
 
 
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