Michael J. SchöningAachen University of Applied SciencesInstitute of Nano- and BiotechnologiesHeinrich-Mußmann-Str. 152428 Jülich, Germanye-mail: schoening@fh-aachen.de Arshak PoghossianAachen University of Applied SciencesInstitute of Nano- and BiotechnologiesHeinrich-Mußmann-Str. 152428 Jülich, Germanye-mail: a.poghossian@fz-juelich.de