碳螺旋纤维的阻抗特性研究

利用化学气相沉积（CVD）法制备微米尺度的碳螺旋纤维, 通过设计的拉伸装置引导试样中的碳螺旋纤维沿拉伸方向有序排列, 使用光学显微镜观察其形貌及排列情况. 具体研究了定向排列碳螺旋纤维的交流阻抗特性, 结果表明：低频时碳螺旋纤维的阻抗和辐角保持不变, 表现为纯电阻行为, 但是高频时（f>10kHz）阻抗和辐角随交流频率升高而迅速减小; 并且碳螺旋纤维对其被拉伸状态很敏感, 阻抗值随拉伸长度增大而增大. 该研究对开发碳螺旋纤维在微电路和微纳米感应器技术中的应用有重要意义.

Research on the Impedance Characteristic of Carbon Coils

Micro-coiled carbon fibers were prepared by chemical vapor deposition method (CVD), and aligned via a device designed for executing action with mechanical drawing. Optical microscope was performed to characterize the morphology and aligned state of the fibers. The AC impedance characteristics (impedance |Z| and phase angle θ) of the aligned carbon coils were studied. The results show that impedance and phase angle of the carbon coils keep stable at low frequency, but decrease rapidly with the frequency increasing at high frequency area (f>10kHz). Furthermore, the aligned fibers are sensitive to their extending states, and their impedance increases with the extending length prolonging. The study is useful to develop the technique of micro-circuits and micro-sensor based on carbon micro-coils.