Petr Slobodian, Pavel Riha, Robert Olejnik, Jiri Matyas and Nuri Karakurt
Tomas Bata University in Zlin, Czech Republic
Posters & Accepted Abstracts: J Material Sci Eng
Statement of the Problem: Thermoelectric devices generate an electrical current when there is a temperature gradient between the hot and cold junctions of two dissimilar conductive materials typically n-type and p-type semiconductors. Consequently, also the polymeric semiconductors composed of polymeric matrix filled by different forms of carbon nanotubes with proper structural hierarchy can have thermoelectric properties which temperature difference transfer into electricity. In spite of lower thermoelectric efficiency of polymeric thermoelectrics in terms of the figure of merit, the properties as stretchability, flexibility, light weight, low thermal conductivity, easy processing and low manufacturing cost are advantages in many technological and ecological applications. Methodology & Theoretical Orientation: Polyethylene-octene copolymer based highly elastic composites filled by multi-walled carbon nanotubes (MWCTs) were prepared by sonication of nanotube dispersion in a copolymer solution followed by their precipitation pouring into non-solvent. The electronic properties of MWCNTs were moderated by different treatment techniques such as chemical oxidation, decoration by Ag clusters or addition of low molecular dopants. In this concept, for example, the amounts of oxygenated functional groups attached on MWCNT surface by HNO3 oxidation increase p-type charge carriers. p-type of charge carriers can be further increased by doping with molecules of triphenylphosphine. For partial altering p-type MWCNTs into less p-type ones, Ag nanoparticles were deposited on MWCNT surface and then doped by 7,7,8,8-tetracyanoquino- dimethane. Both types of MWCNTs with the highest difference in generated thermoelectric power were combined to manufacture polymeric based thermoelectric module generating thermoelectric voltage when temperature difference is applied between hot and cold ends of the module. Moreover, it was found that the generated voltage by the thermoelectric module at constant temperature gradient was significantly affected when exposed to vapors of different volatile organic compounds representing then a self-powered thermoelectric sensor for chemical vapor detection. Acknowledgement This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic ├ó┬?┬? Program NPU I (LO1504) and with the support of the Operational Program Research and Development for Innovations co-funded by the European Regional Development Fund (ERDF) and the national budget of the Czech Republic, within the framework of the project CPS-strengthening research capacity (reg. number: CZ.1.05/2.1.00/19.0409). This project was also supported by the internal grant of TBU in Zlin No. IGA/CPS/2017/002 funded from the resources of the Specific University Research. P. R. would like to acknowledge financial support from the Fund of the Institute of Hydrodynamics AV0Z20600510. Recent Publications: 1. Cai L, Wang C (2015) Carbon nanotube flexible and stretchable electronics. Nanoscale Res. Lett. 10: 320-341. 2. Ismail BI, Ahmed WH (2009) Thermoelectric power generation using waste-heat energy as an alternative green technology. Recent Patents on Electrical Engineering:27-39. 3. Hewitt CA, Kaiser AB, Roth S, Craps M, Czerw R, Caroll DL (2011). Varying the concentration of single walled carbon nanotubes in thin film polymer composites, and its effect on thermoelectric power. Appl Phys Lett. 8:1-3. 4. Hewitt CA, Kaiser AB, Roth S, Craps M, Czerw R, Caroll DL (2012) Multilayered carbon annotate/polymer composite based thermoelectric fabrics. Nano Lett.12:1307-1310. 5. Yu C, Kim YS, Kim D, Grunlan JC (2008) Thermoelectric behavior of segregated-network polymer nanocomposites. Nano Lett. 8:4428-4432. 6. Chen J, Gui X, Wangetal Z. Superlow thermal conductivity 3D carbon nanotube network for thermoelectric applications (2012) ACS Appl Mat Interfaces 4: 81-86. 7. Moriarty GP, Wheeler JN, Yu C, Grunlan JC (2012) Increasing the thermoelectric power factor of polymer composites using a semiconducting stabilizer for carbon nanotubes. Carbon 50:885├ó┬?┬?895. 8. Freeman DD, Choi K, Yu C (2012) N-type thermoelectric performance of functionalized carbon nanotube-filled polymer composites. PLoSONE7:articleIDe47822. 9. Bounioux C, Diaz-Chao P, Campoy-Quiles M, Martin-Gonzales MS, Goni AR, Yerushalmi-Rozen R, Muller C (2013) Thermoelectric composites of poly(3-hexylthiophene) and carbon nanotubes with a large power factor. Energ Environ Sci 6:918-925.
Petr Slobodian received the Ph.D. degree in polymer science from the Faculty of Technology, Tomas Bata University (TBU), Zlin, Czech Republic and the Ms. degree from the Brno University of Technology, Brno, Czech Republic. He is a Scientific Researcher at the Centre of Polymer Systems, TBU. He is the associate professor at the Faculty of Technology since 2008. He is author or co-author of 76 scientific articles all published in the impacted journals. His main interests are polymer composite materials, carbon nanotubes and their use in the organic vapor sensors, strain sensors and stretchable thermoelectric materials.