Material scientist: Electrochemistry and operando spectroscopic measurements

Research interests

- Electrochemistry using soft X-ray emission & absorption spectroscopy (XES & XAS) under operando conditions

- Synchrotron-based X-ray spectroscopy (XES, XAS, XPS...)

- Material research: catalysts for water electrolysis, electrodes for post Lithium-ion batteries ...

Selected publications


  • Schavkan, A.; Gollwitzer, C.; Garcia-Diez, R.; Krumrey, M.; Minelli, C.; Bartczak, D.; Cuello-Nuñez, S.; Goenaga-Infante, H.; Rissler, J.; Sjöström, E.; Baur, G.B.; Vasilatou, K.; Shard, A.G.: Number Concentration of Gold Nanoparticles in Suspension: SAXS and spICPMS as Traceable Methods Compared to Laboratory Methods. Nanomaterials 9 (2019), p. 502/1-20


  • Minelli, C.; Sikora, A.; Garcia-Diez, R.; Sparnacci, K.; Gollwitzer, C.; Krumrey, M.; Shard, A.: Measuring the size and density of nanoparticles by centrifugal sedimentation and flotation. Analytical Methods 10 (2018), p. 1725-1732


  • Garcia-Diez, R.; Gollwitzer, C.; Krumrey, M.; Varga, Z.: Size Determination of a Liposomal Drug by Small-Angle X-ray Scattering Using Continuous Contrast Variation. Langmuir 32 (2016), p. 772-778

  • Garcia-Diez, R.; Sikora, A.; Gollwitzer, C.; Minelli, C.; Krumrey, M.: Simultaneous size and density determination of polymeric colloids by continuous contrast variation in small angle X-ray scattering. European Polymer Journal 81 (2016), p. 641-649


  • Garcia-Diez, R.; Gollwitzer, C.; Krumrey, M.: Nanoparticle characterization by continuous contrast variation in small-angle X-ray scattering with a solvent density gradient. Journal of Applied Crystallography 48 (2015), p. 20-28


  • Engel, N.; Bokarev, S.I.; Suljoti, E.; Garcia-Diez, R.; Lange, K.M.; Atak, K.; Golnak, R.; Kothe, A.; Dantz, M.; Kühn, O.; Aziz, E.F.: Chemical Bonding in Aqueous Ferrocyanide: Experimental and Theoretical X-ray Spectroscopic Study. The Journal of Physical Chemistry B 118 (2014), p. 1555-1563

  • Minelli, C.; Garcia-Diez, R.; Sikora, A.E.; Gollwitzer, C.; Krumrey, M.; Shard, A.G.: Characterization of IgG-protein-coated polymeric nanoparticles using complementary particle sizing techniques. Surface and Interface Analysis 46 (2014), p. 663-667


  • Suljoti, E.; Garcia-Diez, R.; Bokarev, S.I.; Lange, K.M.; Schoch, R.; Dierker, B.; Dantz, M.; Yamamoto, K.; Engel, N.; Atak, K.; Kühn, O.; Bauer, M.; Rubensson, J.-E.; Aziz, E.F.: Direct Observation of Molecular Orbital Mixing in a Solvated Organometallic Complex. Angewandte Chemie - International Edition 52 (2013), p. 1-5