fe_nd_b NtuEee #Materials Defects piezoelectric force microscopy Phthalocyanine PECurve EFMAmplitude ForceVolumeMapping Al2O3 PtfeMembrane Au111 CopperFoil FM_KPFM H-BN IIT-chennai solar_cell Hafnium_dioxide Bacterium Blood hydrocarbon atomic_steps FrictionForce CNT Terrace self_assembly IcelandSpar Typhimurium fifber SingleCrystal AM_SKPM Chemical Vapor Deposition HexagonalBN nanobar Conductance