Nanofiber Polyvinylidene Piezoresponse BiFeO3 TungstenThinFilmDeposition Mechanical CrystalGrowing AtomicSteps SolarCell oxide_layer Chromium Bacterium MonoLayer LiBattery LogAmplifier Electrical&Electronics HydroGel DiffractiveOpticalElements Scanning_Thermal_Microscopy Tapping MBE Materials Lattice Modulus WWafer PinpointPFM Transparent UnivCollegeLondon Sic Phase Electrode Sphere HBN Hafnium_dioxide Monisha