MolecularSelfAssembly UnivMaryland Tin sulfide 2d_materials SKPM LiquidCrystal ForceVolume self-assembly Solar AdhesionForce strontiu_titanate cross section Conductance PtfeMembrane Mfm CP-AFM Subhajjit aluminum_nitride Optoelectronic DomainSwitching CopperFoil Christmas molecular_self_assembly Singapore Sidewall LowDensityPolyethylene Graphene PhthalocyaninePraseodymium Melt layers Terrace FrictionalForce NtuEee FM-KPFM DOE