Location: A718, SINANO   

Abstract:  

In the talk I will give an overview about the topics pursued by our research group. We focus on the colloid chemistry related aspects of systems composed of plasmonic nanoparticles and the utilisation of the particles in optical and optoelectronic applications. 

The topics highlighted in the talk: 

1. Optically trapped single gold nanoparticle used as a highly sensitive sound detector. 

2. Fine control of colloidal forces between gold nanoparticles covered with a thermoresponsive polymer shell-clustering vs. aggregation. 

3. Gold nanorods covered with a thin mesoporous silica shell, where the shell can be used as an elastic nano-container to perform classical nanoparticle growth inside the shell. 

4. Examples how appropriate design of the gold nanoparticles can affect the charge-transfer state related polaron generation in a prototypical organic semiconductor blend. Photocurrent measurements combined with ultrafast pump-probe spectroscopy and electron microscopy studies revealed the importance of the clustering of the nanoparticles in the blend. 

5. Plasmonic back-electrodes for hybrid solar cells based on a bottom-up approach: Langmuir-Blodgett film based corrugated surfaces prepared from sub-micron particles. 

        Andras Deak (1121 Budapest, Konkoly Thege M. str. 29-33. Hungary) 

Biography:  

Andras Deak obtained his PhD in 2007 at the Budapest University of Technology and Economics in Hungary. During this time he developed a comprehensive framework for the is-situ determination of nanoparticle contact angle based on optical measurements on nanoparticle monolayers. 

He spent his post-doc at the group of Prof. Jochen Feldman at the Ludwig Maximilians University in Munich, Germany as an LMUexcellent Research Fellow. He worked on plasmon enhanced and small molecule doped organic solar cells, optical manipulation of nanoparticles and various optical and optoelectronics studies. In Munich he also met Prof. Weihai Ni, who worked at the same place during this time. 

Starting from 2012 he joined the Institute of Technical Physics and Materials Science in Budapest, Hungary. His current research focuses on the overlap between colloid chemistry, optical and optoelectronic phenomena.