SiWafer PFM MBE Conduct Defects vertical_PFM Foil SoftSample OpticalElement molecular_self_assembly Piezo FrictionalForceMicroscopy NtuEee PolyvinylideneFluoride Copolymer Liquid Switching Polyaniline RedBloodCell Solar Polyvinylidene_fluoride PS_PVAC sputter Hafnia Dental gallium_nitride light_emission Mapping Temperature Reduction Optoelectonics Tape Butterfly fluorocarbon FAFailureAnlaysis