Chungnam_National_University Zhi Carbon Force-distance Materials Vacuum LithiumNiobate doped Piranha Optical UnivOfMaryland Growth Optoelectronic molecule Wildtype dielectric trench ScratchMode Polydimethylsiloxane Korea alkanes blended polymers HiVacuum TiO2 AmplitudeModulation LogAmplifier C60H122 suspended_graphene TransitionMetal MagneticForce Blend Graphene Annealed contact Alloy Conductive AFM