Five papers from the international laboratories of Nano-Bioengineering and Hybrid Photonic Nanomaterials on the practical applications of quantum dots published in the Optics and Spectroscopy

The Optics and Spectroscopy has published studies performed in the international laboratories of Nano-Bioengineering (LMBE) and Hybrid Photonic Nanomaterials (LPNM), NRNU MEPhI, in collaboration with other Russian and Western European research centers. The studies were earlier presented at international conference on Photonic Colloidal Nanostructures: Synthesis, Properties, and Applications" (PCNSPA 2018) in St. Petersburg, Russia.

All the five papers concern the use quantum dots, fluorescent semiconductor nanocrystals, in various fields, including medicine, optoelectronics, and photovoltaics.

The paper Advanced Nanotools for Imaging of Solid Tumors and Circulating and Disseminated Cancer Cells by A. Sukhanova, F. Ramos-Gomes, F. Alves, P. Chames, D. Baty, and I. Nabiev summarizes the advantages of conjugates of quantum dots with single-domain antibodies, the smallest possible protein molecules capable of recognizing antigens, in terms of their use as nano-sized fluorescent probes. These nanoprobes can detect not only malignant tumors, but also small new metastases and even single cancer cells in the bloodstream.

Precise and reliable detection of biomarkers with the use of these fluorescent nanoprobes requires that the optimal conditions be selected for the excitation and recording of the quantum dot fluorescence. This issue is dealt with in the theoretical study Optimization of Excitation and Detection Modes to Detect Ultra-Small Amounts of Semiconductor Quantum Dots Based on Cadmium Selenide by Y.A. Kuzishchin, I.L. Martynov, E.V. Osipov, P.S. Samokhvalov, A.A. Chistyakov, and I.R. Nabiev. The authors have constructed a mathematical model and used it to select the operation mode allowing the detection of fluorescence emitted by a very small number of quantum dots.

In photovoltaics, the use of cell membranes of photosynthesizing bacteria to convert the energy of light into electricity is a promising line of research. The study Quantum Dots Improve Photovoltaic Properties of Purple Membranes under Near-Infrared Excitation by V.A. Krivenkov, P.S. Samokhvalov, A.A. Chistyakov, and I.R. Nabiev is a further development of the approach to an increase in the energy conversion efficiency of these systems by incorporating quantum dots in them. In the solar cell developed, these nanocrystals absorb light in a wide spectral range and then transfer the energy to bacteriorhodopsin, a photosensitive protein that generates the electric potential difference across the membrane. The authors have demonstrated the possibility of two-photon light absorption by these hybrid systems in the IR region, which substantially enhances the efficiency of light energy utilization.

Quantum dots are also used for quite the opposite purpose, generation of optical radiation. In the study Near Infrared LED Based On Pbs Nanocrystals by D.A. Onishchuk, A.S. Pavlyuk, P.S. Parfenov, A.P. Litvin, and I.R. Nabiev, a quantum-dot based light-emitting diode has been designed that emits in the near IR spectral region.

A new approach to increasing the quantum yield of quantum dot luminescence has been suggected and analyzed in the study Photoluminescence Properties of Thin-Film Nanohybrid Material Based on Quantum Dots and Gold Nanorods by S.A. Goncharov, V.A. Krivenkov, P.S., Samokhvalov I.R. Nabiev, and Yu.P. Rakovich. The authors have made use of the effect of interaction between the excitons formed in quantum dots and localized plasmons in noble metal nanoparticles. By affecting the photoluminescence lifetime, this interaction allows the probability of biexciton emission to be so increased that it becomes the main component of quantum dot photoluminescence.

The Optics and Spectroscopy is the English version, published since the 1990s, of the Russian journal Optika i spektroskopiya. The journal, founded in 1956, publishes research and review papers on basic and applied research in this field, which are cited in all international databases.

Contacts:

Maria G. Korenkova, LNBE director of external relations (MGKorenkova@mephi.ru)

Alexandra V. Korenkova, LPNM research engineer (alexandrav.korenkova@gmail.com)

Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute
31 Kashirskoe shosse, 115409 Moscow, Russian Federation
http://www.lnbe.mephi.ru/en

Laboratory of Hybrid Photonic Nanomaterials, Moscow Engineering Physics Institute
31 Kashirskoe shosse, 115409 Moscow, Russian Federation
http://lpnm.mephi.ru/index.php/ru/

 
 
 
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