His group also employed modern synchrotron radiation based spectro-microscopy techniques such as SPEM, PEEM and X-ray microdiffraction as well as scanning probe and electron microscopy for in situ and in vivo characterization of individual working nanodevices. Andrei has also pioneered the application of ultrathin 2D materials as electron transparent membranes for (photo-)electron (XPS, PEEM, AES, XAS, SEM) spectro-microscopies in liquids and dense gases. He has published over 150 research papers, several review articles and book chapters, co-authored three patents and has co-edited a book on nanostructured metal oxide sensing systems. Andrei’s current research interests are in the developing of the methodology and instrumentation for in situ electron (and X-ray) imaging and spectroscopic characterization of nanodevices and working interfaces in operando mode under realistic environments, including liquid, dense gaseous and plasma media.