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Nanoscale Self-assembled Oxide Bulk Thermoelectrics

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Nanoscale Thermoelectrics

Part of the book series: Lecture Notes in Nanoscale Science and Technology ((LNNST,volume 16))

Abstract

Thermoelectric materials directly convert thermal energy into electric energy through Seebeck effect. The nanostructured approach for these materials has led to significant improvements in the figure of merit mainly by tailoring the lattice thermal conductivity. In this chapter, we provide an overview of the strategies adopted for phonon scattering and its confinement in the nanostructures with the goal of reducing the thermal conductivity. We discuss the approaches that are being adopted for developing cost-effective thermoelectrics and identify the promise offered by oxide materials. Compared with the alloy-based thermoelectric materials, oxide thermoelectrics have many advantages including abundance of raw materials, low cost, non-toxicity, and thermal stability. Several important oxide thermoelectric candidates are introduced with specific focus on ZnO. Self-assembled nano-composites of ZnO have been shown to exhibit reduction in thermal conductivity by a factor of about three mainly due to the phonon scattering by uniformly distributed nanoprecipitates (ZnAl2O4) and large grain boundary area. The effects of nanoscale inclusion in Ca-Co-O system (Ca3Co4O9) and natural superlattices in SrO/SrTiO3 are also discussed. Several self-assembly techniques are discussed which are promising for fabrication of oxide thermoelectrics.

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Acknowledgments

The authors (Y. Z. and S. P.) gratefully acknowledge the financial support provided by NSF/DOE Thermoelectrics Partnership. The author (A. K.) would also like to acknowledge the support from the CEHMS seed program.

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Authors and Affiliations

  1. Center for Energy Harvesting Materials and Systems (CEHMS), Virginia Tech, Blacksburg, VA, 24061, USA

    Yu Zhao, Ashok Kumar & Shashank Priya

  2. Materials Science and Engineering and Mechanical Engineering, Virginia Tech, Blacksburg, VA, 24061, USA

    Céline Hin

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  1. Yu Zhao
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  2. Ashok Kumar
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Correspondence to Yu Zhao .

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  1. Engineering Research Center for Semiconductor Integrated Technology, Chinese Academy of Sciences, Beijing, People's Republic of China

    Xiaodong Wang

  2. Engineering Research Center for Semiconductor Integrated Technology, Chinese Academy of Sciences, Beijing, People's Republic of China

    Zhiming M. Wang

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Zhao, Y., Kumar, A., Hin, C., Priya, S. (2014). Nanoscale Self-assembled Oxide Bulk Thermoelectrics. In: Wang, X., Wang, Z. (eds) Nanoscale Thermoelectrics. Lecture Notes in Nanoscale Science and Technology, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-319-02012-9_11

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