1. Department of Physical Chemistry, Gdańsk University of Technology, Narutowicza St 11/12, Gdańsk 80-233, Poland
2. BioTechMed Center, Gdańsk University of Technology, Narutowicza St 11/12, Gdańsk 80-233, Poland
3. Department of Applied Physics, KTH Royal Institute of Technology, SE-171 65 Solna, Sweden