Growth CrAu vertical_PFM NCM blended polymers Polytetrafluoroethylene KPFM SiWafer EFM PDMS BFO 2d_materials self-assembly Aluminum Polyaniline Fluoride Corrosion PVAC OpticalWaveguides norganic TipBiasMode LDPE SmalScan GaAs FastScan EFMAmplitude Conducting SICM tip_bias_mode MechanicalProperty PS_PVAC PyroelectricDetector Chloroform phase_change semifluorinated_alkanes