NanoLithography molecular_self_assembly ForceDistanceSpectroscopy DOE Dopped FrequencyModulation PDMS dichalcogenide IIT-chennai Vanadate Collagen nanomechanical DeoxyribonucleicAcid MetalCompound Led semifluorinated alkane hetero_structure Tungsten OpticalElement PUR Optic LiftHeight Cobalt Hafnium_dioxide nanobar ULCA ShenYang Chungnam_National_University Roughness StainlessSteel Co/Cr/Pt HexagonalBoronNitride Silver AdhesionForce Optoelectronic