ScanningSpreadingResistanceMicroscopy LowDensityPolyethylene blended polymers PhaseImaging GaN fluorocarbon cannabis Hafnium_dioxide HighAspect Foil Calcite AtomicSteps AM_KPFM Heating Pinpoint PFM Spain ForceVolumeImage Oxidation TiO2 Ferrite Ferroelectric kelvin probe force microscopy Morphology Molybdenum_disulfide electrospinning membrane Polymer GranadaUniv GaP CuSubstrate SiliconCrystal IMT_Bucharest aluminum_nitride Sphere NUS