BiFeO3 Annealed layers Worcester_Polytechnic_Institute Jason BismuthVanadate optoelectronics gallium_nitride HfO2 Polyethylene Materials LightEmission Polytetrafluoroethylene LiBattery Bismuth chemical_compound atomic_steps NanoLithography Conductive AFM fluorocarbon DeoxyribonucleicAcid SicMosfet nanobar Solution Ceramic conductive Ucl CuFoil pinpoint mode Polypropylene Wafer Silicon ring shape MLCC Heat