tip_bias_mode Jason Spain ForceMapping Crystal vertical_PFM TPU Flake dielectric trench light_emitting Polydimethylsiloxane CuParticle LiIonBattery SFAs gallium_nitride PolyvinylAcetate TransitionMetal Au111 StrontiuTitanate Insulator Cobalt F14H20 Electrode SSRM dichalcogenide Conductivity Optoelectonics H-BN Gallium_Arsenide Treatment cannabidiol hydrocarbon AAO PUR self_healing