piezoelectric force microscopy CalciumHydroxide contact Pipette MolecularSelfAssembly MechanicalProperties Subhajjit Austenite Optical exfoliate PECurve single_layer Chungnam_National_University ForceDistanceSpectroscopy Pzt graphene_hybrid light_emitting FrictionalForceMicroscopy PolyStylene Mechanical pinpoint mode Morphology Thermal NtuEee CVD BaTiO3 Steps Hydroxyapatite Au111 Mobile Modulus BlockCopolymer Conduct Bio Collagen