TriGlycineSulphate exfoliate organic_polymer HexagonalBN Bmp solar_cell neodymium_magnets Subhajjit Lateral amplitude_modulation IISCBangalore Vinylpyridine PolyvinylAcetate LowDensityPolyethylene CastIron Change Tapping LateralForceMicroscopy FrictionalForce silicon_carbide Chungnam_National_University China align gallium_nitride Patterns VinylAlcohol phase_change CrAu Laser CuSubstrate C_AFM heterojunctions NanoLithography ScratchMode Yeditepe_University