Doped Nanofibers and Conductivities

An increasing trend in conductivities was reported with increasing CP content in the structure. 

PPy-PEO composite nanofibers were prepared by polymerizing Py on PEO fibers by Nair et al. 

The sheet conductivities of the PPy-PEO composite nanofiber mats were in the order of 10 S/cm calculated from the four-probe measurement data. Conductivities of electrospun nanofibers measured by using the four-probe method were about 10 S/cm. PPy was coated on PS nanofiber mats, and the conductivities of the PS-Cl-PPy and PS-TS-PPy fiber mats were found to be 2 x 10 S/ cm and 5 x 10 S/cm, respectively. It was demonstrated that the conductivity of the porous fiber mat could be influenced by the amount (PPy/PS ratio), doping, and crystallinity (polymer chain packing) of PPy in the fibers, the void volume, and the connectivity between fibers in the mat. When the PS template of the PS-TS-PPy fiber mat was removed by THF treatment and the electrical conductivity of the remaining material (TS-PPy) was measured, the conductivity increased to 0.13 S/cm by using the four-probe Van der Pauw method.  

The conductivities for PANI fibers reported with different 

Conducting electrospun fiber mats based on PLA and PANI blends were reported by Picciani et al. It was observed that the resistivity values decreased with increasing PANI content and increased with increasing fiber diameter. The contact probability among fibers and the formation of the conductive pathways through the sample were introduced as a reason for that result. Thicker fibers had less contact probability in the same mat volume and an increase in fiber 

---