Increasing the thermoelectric power generated by composite films using chemically functionalized single-walled carbon nanotubes |
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| Affiliation: | 1. School of Electrical Engineering, WCU Flexible Nano-systems, Korea University, Anam-Dong, Sungbuk-Gu, Seoul 136-713, Republic of Korea;2. Sineurop Nanotech GmbH, Muenchner Freiheit 6, 80802 Muenchen, Germany;1. Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi''an, 710021, China;2. School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, 4000, Australia;3. Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia;1. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India;2. Department of Physics, University of Allahabad, 211002 Uttar Pradesh, India;1. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, United States;2. Materials Science Institute, University of Valencia, PO Box 22085, 46071 Valencia, Spain;3. Department of Materials Science & Engineering, Texas A&M University, College Station, TX 77843-3003, United States;1. School of Aerospace Science and Technology, Xidian University, Xi''an 710126, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;3. Institute of Physical Education, Shaanxi Xueqian Normal University, Xi’an 710100, China |
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| Abstract: | We prepared and characterized flexible thermoelectric (TE) materials based on thin films of single-walled carbon nanotube (SWCNT) composites with polyvinylalcohol. While pristine SWCNTs incorporated in a polymer matrix generated a p-type TE material, chemical functionalization of SWCNTs by using polyethyleneimine produced an n-type TE material. TE modules made of both p- and n-type composite were fabricated to demonstrate TE voltage and power generation. A single p–n junction made of two composite strips containing 20 wt.% of SWCNTs generated a high TE voltage of 92 μV per 1 K temperature gradient (ΔT). By combining five electrically connected p–n junctions an output voltage of 25 mV was obtained upon the applying ΔT = 50 K. Furthermore, this module generated a power of 4.5 nW when a load resistance matched the internal module resistance of 30 kΩ. These promising results show the potential of TE energy conversion provided by the SWCNT composite films connected in scalable modules for applications that require light weight and mechanical flexibility. |
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