碳纳米管/环氧树脂复合材料的电子输运性能及微观结构
The electronic transport properties and microstructure of carbon nanofiber/epoxy composites
摘要：
采用超声波和机械混合相结合的方法将碳纳米纤维（CNF）分散到环氧树脂中。通过阻抗谱研究了所得复合材料的电子输运性质。发现非常低的临界重量分数（pc = 0.064wt%），其可以被认为对应于在基质内形成隧穿导电网络。绝缘体到导体的过渡区域跨越约一个数量级，从0.1到1重量%。远离转变，电导率增加了两个数量级。这种增加和电导率的低值解释在CNF之间的接触处的环氧树脂膜的存在。提出了一个简单的模型的基础上的CNF-CNF接触网络内的矩阵，以评估该膜的厚度。
英文摘要：
Carbon nanofibres (CNF) were dispersed into an epoxy resin using a combination of ultrasonication and mechanical mixing. The electronic transport properties of the resulting composites were investigated by means of impedance spectroscopy. It was found that a very low critical weight fraction (pc = 0.064 wt %) which may be taken to correspond to the formation of a tunneling conductive network inside the matrix. The insulator-to-conductor transition region spanned about one order of magnitude from 0.1 to 1 wt %. Far from the transition, the conductivity increased by two orders of magnitude. This increase and the low value of the conductivity were explained in terms of the presence of an epoxy film at the contact between CNF. A simple model based on the CNF-CNF contact network inside the matrix was proposed in order to evaluate the thickness of that film.
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