Fiber and Polymer Science, Department of Textile Engineering, Chemistry and Science, North Carolina State University , Raleigh, North Carolina 27695-8301, United States.
ACS Appl Mater Interfaces. 2012 Jul 25;4(7):3405-15. doi: 10.1021/am3003523. Epub 2012 Jul 5.
Highly porous, Co-loaded, activated carbon nanofibers (Co/AP-CNFs) were prepared by electrospinning a CoCl2-containing polyacrylonitrile composite, followed by thermal treatment processes under air and inert atmospheres. Observations show that carbon nanofibers (CNFs) generated in this fashion have a dramatically large porosity that results in an increase in the specific surface area from 193.5 to 417.3 m(2) g(-1)as a consequence of the presence of CoCl2 in PAN/CoCl2 precursor nanofibers. The nanofibers have a larger graphitic structure, which is enhanced by the addition of the cobaltous phase during the carbonization process. Besides evaluating the morphological and material features of the fibers, we have also carried out a field electron emission investigation of the fibers. The results show that an enhancement in the field electron emission of Co/AP-CNFs occurs as a result of the existence of cobalt in the carbon nanofibers, which results in a greater graphitization, increased specific total surface area and porosity of the carbon nanofibers. Overall, the Co/AP-CNFs are prepared in a facile manner and exhibit an enhanced field electron emission (54.79%) compared to that of pure CNFs, a feature that suggests their potential application to field electron emission devices.
通过静电纺丝含有 CoCl2 的聚丙烯腈复合纤维，然后在空气和惰性气氛下进行热处理过程，制备出高比表面积、Co 负载、多孔的活性炭纳米纤维（Co/AP-CNFs）。观察表明，以这种方式生成的碳纳米纤维（CNFs）具有显著的大孔性，导致比表面积从 PAN/CoCl2 前驱体纳米纤维中存在的 CoCl2 增加到 193.5 到 417.3 m2/g。纳米纤维具有更大的石墨结构，这是在碳化过程中添加钴相增强的。除了评估纤维的形态和材料特征外，我们还对纤维进行了场电子发射研究。结果表明，由于碳纤维中存在钴，Co/AP-CNFs 的场电子发射增强，导致碳纤维的石墨化程度增加，总比表面积和孔隙率增加。总的来说，Co/AP-CNFs 以简便的方式制备，并表现出比纯 CNFs 更高的场电子发射（54.79%），这表明它们在场电子发射器件中有潜在的应用。
