University of Aveiro:

Dr. Rute Sá Ferreira and Prof. Dr. Luis Carlos from the Department of Physics - Optical properties
Prof. Rui Silva from the Department of Ceramics - CNT growth
Dr. Filipe Figueredo from the Department of Ceramics - Ceramics
Dr. A. Kholkin and Mr. D. Kiselev from the Department of Ceramics - AFM
Prof. Dr. Joao Rocha and Dr. Luis Mafra from the Department of Chemistry - Solid State NMR

Seoul National University:

Prof. Dr. Taeghwan Hyeon and Prof. Dr. Yuanzhe Piao - Nanoparticle synthesis
Prof. Dr. Yung-Eun Sung and Seung-Ho Yu - Energy applications
Prof. Dr. Cheol Seong Hwang - ALD

Various Institutes

Prof. Dr. Markus Niederberger from the ETH Zurich - We would need an entire book to describe it. Link

Prof. Dr. Markus Antonietti from the Max Planck Institute of Colloids and Interfaces - Where in 2003 our current research started...

Prof. Dr. R. Schlögl, Dr. M.-G. Willinger from the Fritz Haber Institute, Berlin - Electron microscopy and much more

Dr. Mato Knez from the Max Planck Institute for Microstructure Physics, Halle - ALD

Prof. Dr. David Zitoun from Bar-Ilan University - Nanoparticle synthesis and magnetism

Prof. Dr. G. Neri from the University of Messina - Gas sensing

Dr. Bruno Chaudret and Dr. Pierre Fau from the LCC Toulouse - Gase sensing

Prof. Dr. Serge Ravaine and Dr. Renaud Vallé from the CRPP Bordeaux - Heterostructures synthesis and optical properties

Dr. Tae-Yeol Jeon from Korea Institute of Energy Research - Pt-based electrocatalysts

Dr. Jean-Philippe Tessonnier from the University of Delaware - Functionalization of carbon nanostructures

Prof. Dr. Yves Chabal from the UT Dallas - In situ IR spectroscopy

Prof. Dr. Liz Marzan and Dr. Isabel Pastoriza Santos from the University of Vigo - Gold-metal oxide heterostructures

Prof. Dr. Jeff Pyun from the University of Arizona - Nanostructures synthesis and many crazy projects

Prof. Dr. Goran Ungar from the University of Sheffield - SAXS measurements and structure elucidation

Dr. Fred Favier from the University of Montpellier - Heterostructures and Energy applications