Effect of moisture on the structure and electrical properties of carbonaceous fibers

The electrical resistivity of carbonaceous fibers (CFs) was first investigated in this paper. The influence of moisture absorption on the structure and electrical properties of CFs was characterized by seven batches of CFs prepared by the same process parameters in two years. It found that the electrical resistivity of CFs increased with the prolongation of storage time. Through the structure analysis, it revealed that the surface structure of CFs changed and more defects existed on the fiber surface with the prolongation of storage time. Combining the composition test, it can be proved that moisture adsorption is the main reason for the instability of electrical resistivity. Further analysis of the moisture adsorption showed that the environment brings humidity as an external factor and the changing in changed the structure and composition of the fiber surface by moisture adsorption as an internal factor. The mechanism of moisture adsorption was further revealed and provided a theoretical direction for the use and storage of carbonaceous fibers.