HexagonalBN phase_change FrequencyModulation Mechanical IVSpectroscopy Corrosion Piezo sputter solar_cell I-VSpectroscopy PDMS Ucl Beads LithiumNiobate FailureAnlaysis SPMLabs Cobalt-dopedIronOxide Graphite Ceramics PhaseImaging cannabidiol Water HanyangUniv Patterns Oxide PinpointNanomechanicalMode BismuthVanadate Cell INSPParis LiquidCell Zagreb suspended_graphene frequency_modulation Ferroelectric lift_mode