Enhanced thermoelectric properties of polycrystalline Bi2Te3 core fibers with preferentially oriented nanosheets
Min Sun,
Qi Qian,
Guowu Tang,
Wangwang Liu,
Guoquan Qian,
Zhenguo Shi,
Kaimin Huang,
Dongdan Chen,
Shanhui Xu,
Zhongmin Yang
Affiliations
Min Sun
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Qi Qian
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Guowu Tang
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Wangwang Liu
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Guoquan Qian
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Zhenguo Shi
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Kaimin Huang
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Dongdan Chen
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Shanhui Xu
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Zhongmin Yang
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China; Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China; and Guangdong Provincial Key Laboratory of Fiber Laser Material and Applied Techniques, South China University of Technology, Guangzhou 510640, China
Bi2Te3-based materials have been reported to be one of the best room-temperature thermoelectric materials, and it is a challenge to substantially improve their thermoelectric properties. Here novel Bi2Te3 core fibers with borosilicate glass cladding were fabricated utilizing a modified molten core drawing method. The Bi2Te3 core of the fiber was found to consist of hexagonal polycrystalline nanosheets, and polycrystalline nanosheets had a preferential orientation; in other words, the hexagonal Bi2Te3 lamellar cleavage more tended to be parallel to the symmetry axis of the fibers. Compared with a homemade 3-mm-diameter Bi2Te3 rod, the polycrystalline nanosheets’ preferential orientation in the 89-μm-diameter Bi2Te3 core increased its electrical conductivity, but deduced its Seebeck coefficient. The Bi2Te3 core exhibits an ultrahigh ZT of 0.73 at 300 K, which is 232% higher than that of the Bi2Te3 rod. The demonstration of fibers with oriented nano-polycrystalline core and the integration with an efficient fabrication technique will pave the way for the fabrication of high-performance thermoelectric fibers.
