Abstract Two group of CNT/polydimethylsiloxane flexible films were spin coated by using two kinds of CNTs with different length and same aspect ratio. Results shows that the film conductivity decreases as the film thickness decreases, while the film thickness is less than 40 times of the CNT length. And the downward trend of two groups of films are different. Besides, CNT junctions with structure distortion were well observed experimentally. By introducing CNT structure distortion, film size effect and interface constraint effect into the percolation network model, Monte Carlo simulation results can well fit the experimental data. Simulation results show that the decrease in film conductivity is mainly due to the film size effect. And the interface constraint effect is more obverse for the film prepared by long tubes, which lead to a different downward trend between two groups of films. The influence of some important experimental parameters on the film conductivity are also obtained through calculation. All of these experiment and simulation results could benefit for design of flexible conductive films.

中文翻译：

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具有有限厚度的柔性碳纳米管/聚二甲基硅氧烷复合薄膜的电气特性

摘要 用两种不同长度、相同纵横比的碳纳米管旋涂了两组碳纳米管/聚二甲基硅氧烷柔性薄膜。结果表明，薄膜电导率随着薄膜厚度的减小而降低，而薄膜厚度小于CNT长度的40倍。并且两组影片的下滑趋势不同。此外，通过实验很好地观察到了具有结构畸变的 CNT 结。通过在渗流网络模型中引入碳纳米管结构畸变、薄膜尺寸效应和界面约束效应，蒙特卡罗模拟结果能够很好地拟合实验数据。模拟结果表明，薄膜电导率的下降主要是由于薄膜尺寸效应。而长管制备的薄膜界面约束效应更明显，这导致两组影片呈现不同的下降趋势。还通过计算得到了一些重要的实验参数对薄膜电导率的影响。所有这些实验和模拟结果都有助于柔性导电薄膜的设计。