PUR HighResolution BaTiO3 Topography Conductivity TiO2 Perovskite Piranha Pattern Microchannel Biofilm Tin sulfide Flake SPMLabs Composition TempControl Tin disulfide Aluminum solar_cell Conductive AFM UnivOfMaryland Electrical&Electronics flakes norganic Granada layers Sadowski Temasek_Lab MESA structure Permalloy fe_nd_b Pvdf TappingMode MagneticForce Mechinical