Lecture Topic: Multifunctional Synergy for Enhancing Materials Performance

lecturer: Vladimir Lesnyak

Time: October 9, 2019 (wednesday) 14:30-16:30

Place: Room 426, Qiu Shi Building, Zhongguancun Campus

Organizer: Graduate School, School of Material Science

【Introduction to the lecturer】

Vladimir Lesnyak is currently a senior research scientist at Dresden University of Technology.He received his doctor's degree in polymer chemistry from belarusian state university in 2005, and from 2006 to 2012, he did postdoctoral research in Technische Universiteit Delft with professor a. Eychmuller as co-supervisor.From 2012 to 2015 he conducted research in the Istituto Italiano di Tecnologia with professor L. Manna as co-supervisor.He entered Dresden University of Technology at 2016.Vladimir Lesnyak is research topic editor and Editorial board member at Frontiers in Chemistry, ISRN Nanomaterials journal respectively.Up to now, he has published more than 90 papers including Chem. Soc. Rev., J. Am. Chem. Soc., ACS Nano, Nano Lett., Nano Today, Adv. Mater., Angew. Chem and others, 1 patent, 3 book chapters. The papers have already received about 3700 citations,H-index=33.His current research focuses on the regulation of colloidal synthesis of nanomaterials, physical and chemical properties of nanomaterials, self-assembly of nanoparticles and hybridization of polymers.

【Lecture Information】

Colloidal semiconductor nanocrystals (also known as quantum dots) have evolved during last few decades from fundamental theoretical concepts to real commercial products (one of the recent examples is a line-up of Samsung QLED TVs in which quantum dots are employed as color converters) owing to intensive efforts of a plethora of research groups worldwide. These nanomaterials benefit on one hand from their unique size-dependent optoelectronic properties, based on quantum confinement. On the other hand, their solution-based synthesis is an amazingly simple process, which can be realized in nearly any chemistry lab. Both these factors greatly promote investigation of semiconductor nanocrystals making this field truly interdisciplinary, involving chemists, physicists, biologists, material researchers, engineers, to name the main players.

In this talk, our recent work on the colloidal synthesis of different semiconductor nanocrystals will be summarized. Particular attention will be paid to cation exchange reactions, as a convenient method for modifying the chemical composition of inorganic cores as well as to ligand exchange, as an approach to alter their surface. In the framework of the direct colloidal synthesis a novel approach do dope CdSe nanoplatelets with mercury in order to shift their fluorescence to the red and near-infrared region will be presented. Furthermore, integration of fluorescent semiconductor nanocrystals into composites with polymers, which may be used as luminescent solar concentrators, will be discussed. Quite novel and intensively developed aspect of semiconductor nanoparticles, namely localized surface plasmon resonance, will be touched upon on the example of copper chalcogenide nanocrystals with demonstration of electrochemical modulation of their light absorption and assembly into highly conductive thin films. In addition, a potential application of semiconductor nanocrystals as an active component in field-effect transistors will be shown.