Piranha Piezoresponse Layer Sphere hetero_structure LateralPFM Lateral PhaseImaging Forevision cross section Polyethylene Switching DeoxyribonucleicAcid Conductivity 2-vinylpyridine DNA FrictionalForce Filter Ceramics PVAC cannabidiol Polyvinylidene Gong China TempControl NTU OrganicCompound PinPointMode Ptfe small_scan Spain Tungsten AdhesionEnergy Magnets Composite