| Chemical oscillators can show complex dynamic behavior which attracts much attention in the physics community.In our experiments we introduced a unique method to study the electro-deposition inquasi-2D system. Previously,we have introduced concentration field model for the chemical oscillation behaviors in electro-deposition of copper. When we add a small sine oscillation on the deposition current in this model, the resonance oscillations of this self-oscillation system under sine disturbance shows complex dynamic behavior.From numerical simulations, we find that in a constant electric field, our system has a stable oscillation.When adding some disturbance,we get some more interesting system behaviors that is our chemical oscillation will become unstable or stable in different disturbance frequency. The Lyapunov-index graphs also provide very different system dynamic characters. The result shows that when we increase the frequency of disturbance our system will experience the chaos process and cycle process alternatively.In experiments, to testify result of the previous theory simulation we shall analyze the real-time voltage signals.What is more, the morphologies of the electrochemical deposition should be investigated. We find the same situation that when we change the frequency of sinusoidal perturbation current, chaos and cycle also will appear in both voltage signals and the final morphologies. Especially we get the chaotic nanostructure on the deposition of copper in our experiments. Through the experiments in strong light, we can get marks in voltage waveform and precipitate morphology simultaneously, through which we can make accurate comparison between the voltage signals and the finale copper nanostructures in SEM graphs.Thus we shall find the relationship between the voltage pulse and nanostructure gap and confirm a method effective method to monitor the periodic nano-line array on the deposition of copper. |
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