Negative Differential Resistance and Long-Lived Changes in the Electrical Conductivity of Carbon Composites Induced by Electrothermal Effects

In this study, the negative differential resistance (NDR) phenomenon in two-terminal devices composed of pyrogallol-formaldehyde/ZrO2 composite materials is investigated. It demonstrated that NDR caused by electrothermal effects, which can be observed through dependence on both voltage and temperature. Additionally, it showed peak current peak/valley voltages effectively modulated using electrical pulses produce mild Joule heating. This modulation arises from formation a conductive metastable state, decays to equilibrium according power law kinetics. suggested state generated reversible structural rearrangement induced heat. The ability electronically tune characteristics carbon composites may have potential applications controlled oscillators neuromorphic circuits.