Controllable Synthesis of Mesoporous Cu7Te4 Flowerlike Structures by Cation-Exchange Method and Their Thermoelectric Properties
| Autor: | Xinxin Qu, Shuaipu Zang, Ruixue Li, Zhaohan Li, Weiwei Xu, Jinzhong Niu, Yongguang Cheng |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Phonon scattering Solid-state physics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Crystal chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Chemical engineering Telluride 0103 physical sciences Thermoelectric effect Materials Chemistry Figure of merit Electrical and Electronic Engineering 0210 nano-technology Mesoporous material |
| Zdroj: | Journal of Electronic Materials. 50:4678-4684 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | Developing reliable synthetic methods for metal telluride micro-nanostructures is essential to achieve a breakthrough in the enhancement of their thermoelectric properties. In this article, a simple and reproducible cation-exchange method to fabricate mesoporous Cu7Te4 flowerlike structures by using pre-synthesized β-ZnTe(ethylenediamine)0.5 (β-ZnTe(en)0.5) flowerlike templates for thermoelectric applications is proposed. The cation-exchange temperature plays a key role in the formation of products, and the optimal reaction temperature for mesoporous Cu7Te4 flowerlike structures is about 135°C. During this process, the Cu ions rapidly occupy the vacancies created by the loss of en-molecules and Zn ions in β-ZnTe(en)0.5 templates, and the crystal grains grow to mesoporous Cu7Te4 flowerlike structures, which are proved by the characterization results of x-ray diffraction, electron microscopy, x-ray photoelectron spectroscopy, and nitrogen adsorption-desorption isotherms. Finally, in thermoelectric measurements, mesoporous Cu7Te4 flowerlike structures exhibit higher figure of merit (ZT) than Cu7Te4 flowerlike structures without pores due to the improvement of phonon scattering and electrical conductivity. |
| Databáze: | OpenAIRE |
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