单根双螺旋碳纤维的电输运性质

Electrical Properties of a Single Microcoiled Carbon Fiber

在750～790℃温区,利用镍粉作催化剂,采用催化热解法制备得到形状规则的双螺旋碳纤维。在多功能物性测量仪(PPMS)上测量了单根碳纤维的电阻-温度关系,低温I-V曲线,结果发现在300～13K温区满足三维Mott变程跳跃模型,而在13K以下则符合Efros-Shklovskii变程跳跃模型。在I-V曲线上,观察到低温下逐渐变强的电子-电子相互作用。

Regular microcoiled carbon fibers with a double helix structure have been synthesized by the catalytic pyrolysis of acetylene at 750-790 ℃ by the use of Ni powder as a catalyst and thiophene as a promotor. The resistance measurements by a standard four-probe technique and I-V curves of a single microcoiled fiber are pre- sented. I-V curves and the temperature dependence of the resistance are in accordance with Mott variable range hopping above 13 K and Efros-Shklovskii variable range hopping bellow 13 K.