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Polyvinyl alcohol covalently grafted CNT for free-standing, flexible, and high-performance thermoelectric generator film
- Polyvinyl alcohol covalently grafted CNT for free-standing, flexible, and high-performance thermoelectric generator film
- Ha, Jae Un; Cho, Jangwhan; Yoon, Seongwon; Jang, Min Su; Hassan, Syed Zahid; Kang, Min Gyun; Chung, Dae Sung
- DGIST Authors
- Chung, Dae Sung
- Issue Date
- Nanotechnology, 30(14)
- Article Type
- Author Keywords
- organic thermoelectric generator; grafted single-walled carbon nanotube; flexible device
- We introduce a strategic approach to synthesize covalntly cross-linked carbon nanotube (CNT)-polymer nanocomposites, which can be applied as a free-standing and flexible organic thermoelectric generator film. Esterification of polyvinyl alcohol (PVA) to render PVA-COOH followed by an amide reaction with single-walled CNTs (SWCNTs) functionalized with amino groups (SWCNT-NH2) yielded a covalently grafted PVA/SWCNT composite film with an excellent dispersion of SWCNTs within the polymer matrix as confirmed using Fourier-transform infrared spectroscopy and scanning electron microscopy. This amide reaction could be further optimized with the addition of a small amount of Triton (TM) X-100, which resulted in a better dispersion of SWCNT prior to the amide condensation reaction. Consequently, a covalently cross-linked PVA/SWCNT composite film showed better Seebeck coefficients than those of previously reported non-covalently, physically wrapped polymer/CNT composite films, resulting in a high power factor up to 275 mu W m(-1) K-2. Furthermore, a covalent amide-linking between PVA and SWCNT yielded a free-standing film (30 x 30 mm) with excellent flexibility and notable shelf stability as confirmed by negligible changes in thermoelectric parameters after bending test for 10 000 times with a bending radius of 2 mm and also shelf stability test in ambient condition without any passivation layer for 30 d.
- Institute of Physics Publishing
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- Department of Energy Science and EngineeringPolymer Energy Materials Lab1. Journal Articles
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