Direct evidence for effect of molecular orientation on thermoelectric performance of organic polymer materials by infrared dichroism |
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| Affiliation: | 1. CAS Key Laboratory of Green Printing and State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Automation and Control Processes FEB RAS, 5 Radio St., Vladivostok 690041, Russia;2. Far Eastern Federal University, 8 Sukhanova Str., Vladivostok 690041, Russia;1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan;2. Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan;3. Department of Applied Chemistry, Faculty of Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka 259-1292, Japan;1. Universidade Federal do Rio Grande do Sul (UFRGS), LdSM – Laboratório de Design e Seleção de Materiais, Avenida Oswaldo Aranha 99/604, Porto Alegre, RS CEP: 90033-190, Brazil;2. Universidade Federal do Rio Grande do Sul (UFRGS), Laboratório de Polímeros Avançados (LPA), Avenida Bento Gonçalves 9500, Porto Alegre, RS 91501-970, Brazil;1. University POLITEHNICA Bucharest, Department of General Chemistry, 1-7 Gh. Polizu, Sector 1, 011061 Bucharest, Romania;2. University POLITEHNICA Bucharest, Department of Bioresources and Polymer Science, 1-7 Gh. Polizu, Sector 1, 011061 Bucharest, Romania |
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| Abstract: | A direct evidence by infrared dichroism is reported for the first time for the effect of molecular orientation on thermoelectric (TE) performance of organic polymer materials. The preferred orientation was induced by mechanical uni-axial stretching of the films of neat polyaniline (PANI) and its nanocomposites with reduced graphene oxide (rGO) or multi-walled carbon nanotube (MWCNT). Five characteristic bands of Fourier transform infrared (FTIR) spectra were chosen, and quantitative investigations were carried out using the dichroic ratios measured by polarized FTIR spectra. The influences of draw ratio and content of inorganic carbon nanoparticles were taken into account. The results show that the TE performance (including anisotropic TE function) can be conveniently tuned by polymer molecular orientation induced by mechanical stretching, which shed light on the understanding of molecular mechanism towards structure-TE performance relationship, and will speed up the applications of organic polymer TE materials. |
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| Keywords: | Organic polymer Thermoelectric performance Molecular orientation Infrared dichroism Nanocomposites |
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