DOE Global_Comm multi_layer CntFilm Conductivity contact plastics GaAs PrCurve Phthalocyanine membrane HanyangUniv OrganicSemiconductor Electical&Electronics KPFM plastic STM blended polymers CastIron FrictionForce Pyroelectric Organic hydrocarbon GaN Galfenol SoftSample dichalcogenide Calcium optoelectronics Force-distance SicMosfet WS2 Conduct AtomicSteps CBD