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RESEARCH PAPER

Research on power factor of BNNT/Bi2Te3 and BCNNT/Bi2Te3 nanocomposite films Ling Li & Xiangqian Jiang & Chuncheng Ban & Dequan Xie & Weiping Chen & Keguan Song & Xiaowei Liu

Received: 17 June 2020 / Accepted: 16 September 2020 # Springer Nature B.V. 2020

Abstract Thermoelectric (TE) material nanocomposite film is widely used in the design of many kinds of wearable flexible device and portable sensors. Herein, BNNT/Bi2Te3 and BCNNT/Bi2Te3 TE nanocomposite films were successfully fabricated by a cost-effective hot pressing and millipore membrane filter (HPMMF) method. Their thermoelectric performance was systematically investigated at room temperature, the highest power factor of the TE nanocomposite film was 1843.2 nW/mK2 when the film contained 0.006 wt.% BCNNT. The Seebeck coefficient of the thermoelectric nanocomposite film will reach up 205 μV/K. The power factor of BCNNT/Bi2Te3 TE nanocomposite film is 17.2 times higher than that of BNNT/Bi2Te3 nanocomposite film and 14 times higher than that of Bi2Te3 film. It is promising to be used in many situations such as flexible

Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11051-020-05025-z) contains supplementary material, which is available to authorized users. L. Li : X. Jiang : C. Ban : D. Xie : W. Chen : X. Liu MEMS Center, Harbin Institute of Technology, Harbin 150001, China L. Li (*) : W. Chen : X. Liu Key Laboratory of Micro-systems and Micro-Structures Manufacturing, Ministry of Education, Harbin 150001, China e-mail: [email protected] K. Song (*) The Third Department of Orthopaedics, The First Affiliated Hospital of Harbin Medical University, Harbin 150001, China e-mail: [email protected]

wearable device and solar cell thermoelectric power generation.

Keywords Bismuth telluride (Bi2Te3) . Boron nitride nanotube (BNNT) . Thermoelectric (TE) nanocomposite film . Carbon-doped boron nitride nanotube (BCNNT) . Power factor (PF)

Introduction It is a main subject to realize the effective development and utilization to fit the demand of energy, which is in extensive research at present, especially in the storage and conversion of energy (Liu et al. 2012; Shi et al. 2019a; Mitra et al. 2018; Wang et al. 2011a; Lu et al. 2014). Depending on the performance of directly converting heat energy to electric energy via the Seebeck effect, thermoelectric (TE) materials are environmentally friendly because of the possible energy recovery from industrial waste heat or natural heat. Despite their vast potential, only few materials can be used in practical application. In fact, most TE materials are expensive and highly toxic, such as some materials containing the rare elements germanium and tellurium, or containing highly toxic plumbum elements. Therefore, the development of cheap, non-toxic, and highperformance TE materials is of great significance for improving the environmental protection characteristics and application value of TE materials. A dimensionless coefficient figure of merit (ZT) and powe