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Bernal Institute Research Forum

Date: Monday, November 12, 2018
Time: 16:00 to 17:00
Duration: One hour
Contact: Joan O'Riordan - joan.oriordan@ul.ie
Location: MSG-025 MSSI Building Extension, Ireland

PRESENTATION BY Dr Shalini Singh Ghent University Belgium

PRESENTATION TITLE The Surface Science of Semiconductor Nanocrystals

ABSTRACT Semiconductor nanocrystals have been attracting widespread interest in nanoscience and technology as building blocks for applications ranging from biomedical diagnostics to photovoltaics and opto-electronics. By now, about 25 years of effort in the synthesis of semiconductor nanocrystals, especially by bottom-up colloidal synthesis methods, has resulted in the formation of a diverse range of nanocrystals with precisely controlled dimensions, crystal structure and composition. All these different types of nanocrystals share one common feature of large surface-to-volume ratio which makes the surface an important player in the chemical and physical processes. Hence, understanding, controlling and adjusting the termination of the surface of nanocrystals is essential for nanomaterial synthesis, processing and application.

In this talk, progress in surface chemistry of colloidal semiconductor nanocrystals will be discussed. The importance of Nuclear Magnetic Resonance (NMR) Spectroscopy in understanding the molecular level of organic surface ligands will be highlighted. The relationship between the surface chemistry to the nanocrystals properties will be explained by the atomistic computational modelling of nanocrystals capped with ligands. Finally, the recent work on the surface chemistry of two-dimensional semiconductor nanocrystals will be presented.

ABOUT THE PRESENTER Shalini Singh is a FWO postdoctoral researcher in the Physics and Chemistry of Nanostructures (PCN) at Ghent University of Belgium. She received a Masters in Organic Chemistry from Gorakhpur University, India and a PhD in Inorganic Chemistry from University of Limerick. She was awarded a postdoctoral fellowship from Research Foundation-Flanders (FWO), Belgium in 2017. Her research is dedicated to the colloidal synthesis and application of semiconductor nanocrystals in photonics and bio-technologies. Working at the interface between chemistry, physics and biology she is designing novel nanoparticle architectures for optical down-conversion applications in displays, bio-imaging and luminescent solar concentrators. She is also studying the surface-ligand chemistry of 1-D and 2-D semiconductor nanocrystals with multi-element compositions for improving their robustness and optical properties. Apart from managing different project collaborations with scientists from VU Amsterdam, LMU München, IEMN Lille, France and UGent, Belgium, she is supervising 3 PhD students, one Masters thesis and Bachelors projects.

Tea/coffee will be available at 15h45

For further information, please contact: kevin.m.ryan@ul.ie