Piranha SiWafer molecules NusEce TriGlycineSulphate Mechanical&nanotechnology bias_mode Hair ScanningTunnelingMicroscopy self_healing HanyangUniv Hydroxyapatite EPFL exfoliate frequency_modulation PS_LDPE Iron SurfaceChange Pinpoint PFM PinPointMode Phosphide C_AFM PhaseTransition TyphimuriumBiofilm ConductingPolymer flakes Fiber Ceramic SThM light_emission Cobalt-dopedIronOxide semifluorinated_alkanes high_resolution align PhaseChange