EPFL Phenanthrene University_of_Regensburg biocompatible Polystyrene PFM CrAu 3-hexylthiophene Solar Austenite LFM Wildtype SingleCrystal HexagonalBN Stiffness UTEM WPlug MetalCompound AdhesionEnergy Polyvinylidene_fluoride NanoLithography DOE contact Mfm BTO Piezo piezoelectric force microscopy lithography medical C36H74 SmallScan PVAC Conductivity TCS single_layer