LightEmission piezoelectric force microscopy BismuthVanadate semifluorinated_alkane Beads domain_switching Hafnium_dioxide EFM Gallium CalciumHydroxyapatite Lanthanum_aluminate InorganicCompound Spain CuParticle StrontiumTitanate Temasek_Lab electrospinning Worcester_Polytechnic_Institute University_of_Regensburg Memory Hysteresys block_copolymer self-assembly Blend PinpointNanomechanicalMode Metal-organicComplex Aluminium_Oxide Stiffness gallium_nitride Optoelectronic dielectric trench polyvinyl acetate fe_nd_b KAIST Sapphire