Gong Device Polarization PDMS hydrocarbon Alkane Floppy Conducting Polyethylene SiliconeOxide Force-distance lithography Carbon hetero_structure HydroGel ContactModeDot DeflectionOptics Bismuth Stiffness Fe_film FuelCell Regensburg mfm_amplitude PolyimideFilm MBE Moire LateralForceMicroscopy fe_nd_b Polyaniline DiffractiveOpticalElements mechanical property ElectrostaticForceMicroscopy flakes SRAM Edwin