摘要
We report a voltage-induced resistance drop with power-law behavior in silver nanoparticle composites operated near the conductor-to-insulator percolation threshold (PT). Upon prolonged electrical pulsing, resistance decreases in a time-dependent power-law fashion, indicating dynamic plasticity in the composite's internal network. We identify a threshold voltage (~ \text{5} {\,}\text {V}) required to trigger this effect and demonstrate partial recovery via thermal annealing at \text{80} ^{~\circ }\text {C}. This behavior is reminiscent of spike-timing-dependent plasticity (STDP), drawing parallels to synaptic learning dynamics observed in neuromorphic architectures. To explain these dynamics, we develop a percolation-based resistor network model incorporating STDP-like updates. Our results highlight tunable resistive behavior in silver nanoparticle composites at the edge of percolation and bridge percolation physics with bio-inspired learning mechanisms.