Join us in the IAS STEM Graduate Colloquium by our distinguished speaker, Prof Andrey Rogach from City University of Hong Kong.
About the talk
Carbon dots (CDs) – small crystalline or amorphous carbon-based quasi-spherical nanoparticles – have attracted much attention as promising fluorescent materials. One of their widely accepted advantages is the simplicity of the formation of highly luminescent CDs from a wide variety of organic precursors. At the same time, several studies on these chemically synthesized CDs raised questions about the chemical nature of the resulting products; their strong luminescence can originate from the presence of molecular organic fluorophores.
On the other hand, use of proper synthetic procedures yield purely carbon dot samples of different sizes; color-tunable fluorescence of CDs with blue, green, yellow, orange, red and even near-infrared emission can be achieved, with the color depending on size of the π-conjugated domains in the CD graphitic core. We have recently extended the family of these light-emitting colloidal carbon nanoparticles towards other shapes, such as nanorods with linearly polarized emission, nanobelts and nanorolls, and demonstrated CDs with a chiral emission. Application of CDs are plenty, and range from luminescent solar concentrators to light-emitting devices. Machine learning approach can be used to improve the sensing capabilities of CDs towards ethanol molecules in real settings.
Our Distinguished Speaker
Prof Andrey Rogach's research focuses on the synthesis, assembly and optical spectroscopy of colloidal semiconductor and metal nanocrystals, alongside their hybrid structures and applications in energy-related and optoelectronic fields. He has been recognised as a highly Cited Researcher by Clarivate Analytics continuously since 2018.
He received his PhD in Physical Chemistry from the Belarusian State University focusing on silver nanoparticles in different media. He worked as a postdoc and then as a staff scientist at the University of Hamburg, before joining the University of Munich as a tenured lead staff scientist. He joined City University of Hong Kong as a Full Professor in 2009 and was promoted to Chair Professor in 2012.