SKKU frequency_modulation MLCC Piranha non_contact Ito China PetruPoni_Institute Optic piezoelectric force microscopy self-assembly HydroGel Granada HBN DNA Laser Organic Au111 PrCurve SelfAssembly FM_SKPM PVA #Materials EFM Cell organic_polymer FAPbI3 IISCBangalore Spincast flakes phase_change CBD HfO2 Led ring shape