PUR Worcester_Polytechnic_Institute Heat Hexylthiophene Au111 Blend Monisha Chemical_Vapor_Deposition PhaseImaging PECurve mechanical property GaP TungstenDeposition Iron phase_change Heating Stiffness HighResolution FrequencyModulation Polyimide NUS_Physics NUS MfmAmplitude Sic KPFM FrictionalForce LateralForce Battery Pvdf Ananth atomic_steps conductive Al2O3 AlkaneFilm frequency_modulation