Carbon fibers have promising applications in the efficient transmission of electric power with less resource consumption. Laser graphitization of the mesophase pitch-based carbon fiber (MPCF) was proposed to improve the electrical conductivity of the carbon fiber. The obtained MPCF showed a high conductivity of 7.04 × 10⁵ S/m. The graphitization degree of carbon fiber increased and the interlayer spacing of its graphite crystal decreased on increasing the laser intensity. With a laser power of 360 W and an irradiation period of 25 s, corresponding to a temperature of 3001 °C, a high graphitization degree (R = 0.02) was obtained and the interlayer spacing was as small as 0.338 nm, close to that of pure graphitic carbon (0.335 nm). The enhanced electrical conductivity is attributed to the improved homogeneity of graphitization along the axial and radial directions, the ordered structural evolution, ordered stacking of the graphitic layer, and the promoted connectivity between the graphitic crystals in the carbon fiber. The energy consumption of the proposed method is estimated to be only 0.46% of that with the conventional Joule heating approach. This work suggests that laser-induced graphitization is a good alternative to prepare carbon fibers with high electrical conductivity and reduced energy consumption.

中文翻译：

---

碳纤维具有高电导率：中间相节距细丝的激光辐照获得高石墨化度

碳纤维在电力的有效传输中具有较少的资源消耗方面具有广阔的应用前景。提出了中间相沥青基碳纤维（MPCF）的激光石墨化，以提高碳纤维的导电性。所得的MPCF显示出7.04×10 ⁵ S / m的高电导率。随着激光强度的增加，碳纤维的石墨化程度增加，石墨晶体的层间距减小。在360 W的激光功率和25 s的照射时间（对应于3001°C的温度）下，石墨化度高（R＝ 0.02），并且层间间隔小至0.338nm，接近纯石墨碳（0.335nm）。导电性的提高归因于沿轴向和径向方向的石墨化均质性的提高，结构层的有序发展，石墨层的有序堆积以及碳纤维中石墨晶体之间的连通性提高。估计该方法的能耗仅为传统焦耳加热方法的能耗的0.46％。这项工作表明，激光诱导石墨化是制备具有高电导率和降低能耗的碳纤维的良好选择。