Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 8, Pages 2634-2640Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14008c
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2013CB632503]
- National Natural Science Foundation of China [51102268, 51121064, 51072216]
- Shanghai Municipal Natural Science Foundation [11ZR1442000]
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Pure polyaniline (PANI) films with different molecular chain packing states were successfully prepared by simply tuning the m-cresol content in the solvent. The SEM and AFM images display that the films are dense and smooth. The Vis-UV spectrum and Raman spectrum suggested that the conformation of PANI molecules changed from a compacted coil to an expanded coil by the chemical interactions between PANI and m-cresol, which enhanced the delocalization of pi-polarons along the polymer chain. The XRD analysis indicated that the PANI molecular chain with different ordered degrees formed during the solvent evaporation process. Furthermore, the measurement of temperature-dependent electrical conductivity confirmed that the ordered regions in PANI molecular structures were enhanced with increasing m-cresol content, which decreased the hopping barrier and increased the carrier mobility. Consequently, when the m-cresol content increased, the electrical conductivity increased remarkably, while the Seebeck coefficient maintained the same level or increased slightly. The experimental results clearly reveal the intrinsic effect of molecular structure on the electric transport of conducting polymers. It strongly suggests that increasing the ordered regions in the polymer molecular chain structure is an effective way to improve the thermoelectric properties of conducting polymers.
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