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采用偏压受限扩散聚集模型研究溶液中银树形纳米结构的生长。模拟中,在二维正方形格子中引入了等腰直角三角形粒子进行模拟,同时运用不同的粘贴概率来描述表面活性剂的效果。模拟结果表明树形纳米结构随着偏压的增大而变得更密。表面活性剂的加入使得树形纳米结构变得更加对称和规则。更进一步,当表面活性剂的效果足够强且外加偏压很小的时候,银纳米颗粒聚集成了银纳米片。模拟结果有利于定性解释相关的实验结果。
Bias - constrained diffusion - aggregation model was used to study the growth of silver - dendritic nanostructures in solution. In the simulation, isosceles right triangular particles were introduced into the two-dimensional square grid to simulate the effect of the surfactant with different affixing probabilities. Simulation results show that the dendritic nanostructures become denser with increasing bias voltage. The addition of surfactants makes the dendritic nanostructures more symmetrical and regular. Further, silver nanoparticles aggregate into silver nanosheets when the effect of the surfactant is strong enough and the bias voltage is small. The simulation results are helpful for the qualitative interpretation of the related experimental results.