NusEce DOE SurfaceChange Workfunction HardDiskMedia Ca10(PO4)6(OH)2 organic_polymer Vac Thermoplastic_polyurethane oxide_layer GaN Worcester_Polytechnic_Institute InorganicCompound layers PhthalocyaninePraseodymium Nanofiber Pattern semifluorinated_alkanes HexagonalBN Polyurethane Nanopattern Film Hexacontane SiliconeOxide Conductance ThinFilm flakes Fet Silver SetpointMode Formamidinium_lead_iodide Step SoftSample LFM SKPM