graphene_hybrid IMT_Bucharest Mobile Hair SRAM StrontiumTitanate FrictionalForce Piezoresponse Switching Granada Floppy pinpoint mode MoS2 AM-KPFM Optic Chungnam_National_University Praseodymium C36H74 self_assembly Nanopattern Boundary Zagreb silicon_carbide HfO2 KPFM Ceramic 2d_materials STO Christmas Edwin Gallium HexagonalBN Transparent ContactModeDot rubber