molecular_self_assembly PVAP3HT mono_layer Perovskite ForceVolumeImage phase_change Blood PvdfBead ferromagnetic Tungsten_disulfide KPFM 2-vinylpyridine Polystyrene IcelandSpar mechanical property Sadowski VinylAlcohol layers nanomechanical Force-distance LightEmiting Chemical_Vapor_Deposition Piezoresponse Boron STM Formamidinium_lead_iodide high_resolution Korea LiNbO3 Pores PetruPoni_Institute exfoliate GaN AnodizedAluminumOxide hard_disk_media