Singapore polyvinyl acetate ScanningIon-ConductanceMicroscopy Optical SPMLabs polymeric_arrays solar_cell LowDensityPolyethylene Pinpoint PFM contact Change UnivCollegeLondon LiquidCrystal LiftMode lithography TungstenDeposition TiO2 PetruPoni Reading ForceVolume MfmPhase Fendb chemical_compound AIN Wang PetruPoni_Institute LateralPFM fe_nd_b Lateral IMT_Bucharest Self-assembledMonolayer MetalCompound CuParticle UnivOfMaryland Terrace