Beads ForceDistanceSpectroscopy Step gallium_nitride H-BN HDD solar_cell LMF ScanningIon-ConductanceMicroscopy LFM amplitude_modulation Zhi BiVO4 FuelCell Piezo neodymium_magnets Lift Fet Nanopattern fifber ThermalProperties TyphimuriumBiofilm ForceVolume OxideLayer PetruPoni PinpointPFM TappingMode Gong HexagonalBN Ucl Typhimurium plastic Metal-organicComplex PolyStylene optoelectronics