hetero_structure AM-KPFM PetruPoni_Institute ThermalConductivity Step Ca10(PO4)6(OH)2 Temperature LeakageCurrent align Temasek_Lab Electical&Electronics Piezoresponse Adhesive KelvinProbeForceMicroscopy PetruPoni food China C_AFM SKPM FastScan BlockCopolymer Cell Ni81Fe19 TungstenDeposition Inorganic Nanostructure LowDensityPolyethylene SurfaceChange Cross-section ScratchMode DOE IVSpectroscopy doped Growth molecular_self_assembly