Materials PDMS Collagen MechanicalProperties I-VSpectroscopy layers IVSpectroscopy small_scan Nanostructure Writing pulsed_laser_deposition TungstenThinFilmDeposition Singapore Force-distance PetruPoni_Institute SKPM Vanadate INSPParis single_layer Pore Cobalt-dopedIronOxide Vac ForceVolumeImage NUS_Physics ferromagnetic Chrome Beads Friction Heat TiO2 LithiumNiobate molecule Alkane nanomechanical Growing