SoftSample ContactMode Gong HexagonalBN mechanical property flakes HiVacuum Electrode CHRYSALIS_INC Wildtype DIWafer Beads Vacuum OpticalElement MBE NUS VerticalPFM SiliconeOxide dichalcogenide Blend CrAu UTEM conductive DNA CntFilm Transparent Biofilm VortexCore PvdfFilm LiftHeight HumanHair SolarCell ForceDistanceSpectroscopy amplitude_modulation Foil