YszSubstrate DNA CeNSE_IISc Mechinical MoirePattern Sphere lift_mode Indium_tin_oxide PhaseImaging Step BreastCancerCell GalliumPhosphide Layer FM-KPFM organic_polymer Tungsten PetruPoni_Institute PinpointPFM Mapping CancerCell Materials Subhajjit 2d_materials Graphite Calcium Carbon C36H74 FFM Lateral amplitude_modulation CP-AFM Sidewall Conductance KevlarFiber KAIST