ChemicalCompound ContactModeDots AM_KPFM fluoroalkane KPFM LDPE SThM UnivMaryland PolymerBlend Switching contact IMT_Bucharest self_assembly Treatment CuParticle Floppy Blend Polystyrene Temasek_Lab SiliconCrystal Piezo Wonseok dielectric_trench TriGlycineSulphate Stiffness Graphene molecular_self_assembly Vac thermoplastic_elastomers HexagonalBoronNitride Phthalocyanine CNT Calcite SmallScan atomic_steps