gallium_nitride GranadaUniv ThermalConductivity BismuthVanadate epitaxy Morphology Non-ContactMode PinpointNanomechanicalMode Holes PolycrystallineFerroelectricBCZT Polytetrafluoroethylene Annealed PolymerBlend BismuthFerrite Graphite Spain mono_layer atomic_steps CP-AFM Vac Bmp YszSubstrate LiBattery CrystalGrowing semifluorinated alkane lithography IcelandSpar Electronics Hexylthiophene lift_mode Lattice Permalloy MBE single_layer CVD