Eco-friendly, low-cost synthesis of tellurium nanowires and their enhanced thermoelectric properties

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-02-19 DOI:10.1016/j.apsusc.2025.162733

Seungwon Kang , Kiseok Lee , Keonkuk Kim , Jeongin Jang , Haeweon Jung , Bhakti D. Jadhav , Jae Sung Son , Ji Eun Lee

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Abstract

We report a simple, cost-effective, and environmentally friendly hydrothermal synthetic method for tellurium (Te) nanowires, using inexpensive precursors and water as a green solvent. The synthesized Te nanowires exhibit high crystallinity and uniform morphology, with lengths extending to several tens of microns. By adjusting the precursor concentration, we could easily control the length of the nanowires. The simplicity and low cost of this synthesis for Te nanowires enabled the production of sufficient quantities for consolidation into bulk pellets for thermoelectric property measurements. Compared to pellets made from commercial Te powder, the Te nanowire pellets demonstrated similar or slightly higher electrical conductivity and a significantly higher Seebeck coefficient, leading to an improved power factor. Additionally, the Te nanowire pellets exhibited reduced thermal conductivity, attributed to enhanced phonon scattering at the interfaces and the inherent porosity of the pellet. The combination of these factors resulted in superior thermoelectric performance, as indicated by higher ZT values across a range of temperatures. This study shows the potential of nanostructured Te for high-performance thermoelectric applications.

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环保、低成本合成碲纳米线及其增强热电性能

我们报道了一种简单、经济、环保的水热合成碲纳米线的方法，使用廉价的前驱体和水作为绿色溶剂。合成的Te纳米线结晶度高，形貌均匀，长度可达几十微米。通过调整前驱体的浓度，我们可以很容易地控制纳米线的长度。这种合成纳米线的简单性和低成本使得能够生产足够数量的纳米线，用于固化成块状颗粒，用于热电性能测量。与商用Te粉末制成的颗粒相比，Te纳米线颗粒具有相似或稍高的导电性，塞贝克系数显著提高，从而提高了功率因数。此外，由于界面声子散射增强和颗粒固有的孔隙率，Te纳米线颗粒的导热性降低。这些因素的结合导致了优异的热电性能，正如在温度范围内较高的ZT值所表明的那样。这项研究显示了纳米结构Te在高性能热电应用方面的潜力。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.