PS_LDPE LateralPFM Resistance TappingMode Dopped Crystal Graphite Etch MechanicalProperty PpLdpe GaN Gallium_Arsenide Piezoelectric chemical_compound NeodymiumMagnets contact GalliumPhosphide light_emitting Wonseok HiVacuum KPFM Dimethicone Fiber cannabinoid Reading Polypropylene fe_nd_b molecule Piranha I-VSpectroscopy Chloroform temperature controller AFM CopperFoil Wang Blood