nanomechanical amplitude_modulation Wang CuFoil Glass high_resolution AM-KPFM OrganicSemiconductor Fet Treatment IMT_Bucharest blended polymers LDPE single_layer SiliconCrystal I-VSpectroscopy ito_film PhaseTransition MoirePattern OpticalElement self_healing Polyimide Piezoresponse Pores MBE GaN Writing SurfaceChange SAM StyreneBeads CrossSection fluoroaalkane Al2O3 Terrace flakes