NUS graphene_hybrid Oxidation Step mechanical_property Ecoli Polyethylene Austenite Electrical&Electronics Heating ElectrostaticForceMicroscopy Scanning_Thermal_Microscopy Cross-section fluoroaalkane Boron Nanostructure DOE frequency_modulation MfmAmplitude SiliconOxide Phase EFM optoelectronics Ferrite Korea LogAmplifier self_healing I-VSpectroscopy Deposition pinpoint mode Bacteria ThermalProperties HexagonalBoronNitride FM-KPFM polyvinyl acetate