semifluorinated alkane PatternedSapphireSubstrat mechanical property Calcium flakes PUR ForceVolume Materials SurfaceOxidation Phase Grain NUS Polyvinylidene_fluoride HBN Electrode Austenite MESA structure Defect Gong PECurve Calcite Nanopattern Tungsten Treatment Microchannel Graphite Adhesive Self-assembledMonolayer Boundary Hexatriacontane Oxidation SrO PinPointMode Fe_film ContactMode