C36H74 heterojunctions PMNPT exfoliate ring shape Transparent oxide_layer Stiffness MagneticForce nanobar Zhi Hexylthiophene HanyangUniv self_healing EFM Zagreb LowDensityPolyethylene TemperatureControlledAFM HACrystal BTO AAO Sic fluoroalkane PolyvinylideneFluoride Collagen PtfeFilter NanoLithography Melt Crystal Lattice Heat Step chemical_compound Microchannel TungstenDeposition