Calcium FrictionForce Deposition STO Hysteresys membrane HiVacuum Self-assembledMonolayer Steps Dr.JurekSadowski Tungsten_disulfide NUS_Physics Pipette Sic ConductiveAFM Ferroelectric AlkaneFilm Hafnium_dioxide CP-AFM plastic Aluminum ContactMode LiftMode DomainSwitching STM domain_switching UnivCollegeLondon ForceDistanceSpectroscopy Oxidation MembraneFilter LaAlO3 Water 2dMaterials Silver align