doped temp hydrocarbon MoS2 BoronNitride temp_control 2dMaterials VerticalPFM FrictionalForce ring shape fluorocarbon China Morphology PinpointNanomechanicalMode Dopped Foil HafniumDioxide Boron Hexatriacontane MechanicalProperties Organic Optoelectonics mechanical property molecules Implant OrganicSemiconductor SelfAssembly molecular_beam ThermalProperties CeramicCapacitor CalciumHydroxyapatite graphene_hybrid AM_KPFM ForceVolumeImage LowDensityPolyethylene