GalliumPhosphide lift_mode AM-KPFM Film BismuthFerrite Pinpoint PFM HexagonalBN temperature controller AFM HOPG UnivMaryland electrospinning Piranha Optoelectonics hard_disk_media plastic IIT-chennai mfm_amplitude plastics AlkaneFilm I-VSpectroscopy MechanicalProperty medical Hysteresys PolycrystallineFerroelectricBCZT contact Pore ito_film Tapping Chemical_Vapor_Deposition ShenYang Strontium DeoxyribonucleicAcid self-assembly Resistance Indium_tin_oxide