Nickel CNT Gallium DiffractiveOpticalElements LateralForce NUS_NNI_Nanocore Vacuum Chrome HexagonalBN Phthalocyanine Friction CalciumHydroxyapatite FM_KPFM PVAC lithography BTO KevlarFiber LifeScience fifber 2d_materials Insulator Perovskite ShenYang Polymer Boundary Gong Vanadate SurfaceOxidation HighAcpectRatio piezoelectric force microscopy align Lateral_Force_Microscopy C36H74 HardDiskMedia vertical_PFM