尺寸控制的Au-Cu2Se核壳纳米粒子及其热电性质。,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

尺寸控制的Au-Cu2Se核壳纳米粒子及其热电性质。
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-15 , DOI: 10.1021/acsami.0c08149
Yingshi Jin ₁ , Junphil Hwang ₁ , Mi-Kyung Han ₁ , Wonhyuk Shon _{2,

3} , Jong-Soo Rhyee ₂ , Sung-Jin Kim ₁

Affiliation

改善热电能量转换的一种有前途的方法是使用纳米结构的界面，该界面既可以提高塞贝克系数，又可以降低导热系数。在这里，我们通过控制溶液中的前体浓度合成了具有不同壳厚度的Au-Cu ₂ Se核壳纳米颗粒。金铜₂Se核-壳纳米粒子的尺寸约为37-53 nm，纳米结构的核由大小约为11 nm的Au纳米粒子组成。在使用火花等离子体烧结（SPS）技术将核壳纳米颗粒烧结成颗粒后，研究了壳厚度对核壳纳米复合材料热电性能的影响。通过在Au / Cu ₂ Se界面中通过能量过滤提高Seebeck系数和通过在界面中的欧姆接触有效调整载流子浓度的协同效应，可以优化功率因数。相干声子散射降低了核-壳纳米复合材料的晶格热导率，这是由于核-壳界面中的相移而引起的声子的波状干涉。最高的Au-Cu ₂ Se核-壳纳米复合材料的壳厚度为21 nm，在723 K时ZT值为0.61 ，高于纯Cu ₂ Se纳米复合材料或Au和Cu ₂ Se颗粒的混合物的ZT值。

"点击查看英文标题和摘要"

Size-Controlled Au-Cu2Se Core-Shell Nanoparticles and Their Thermoelectric Properties.

One promising approach to improving thermoelectric energy conversion is to use nanostructured interfaces that enhance Seebeck coefficient while reducing thermal conductivity. Here, we synthesized Au–Cu₂Se core–shell nanoparticles with different shell thicknesses by controlling the precursor concentration in solution. The Au–Cu₂Se core–shell nanoparticles are about 37–53 nm in size, and the cores of the nanostructures are composed of Au nanoparticles with sizes of ∼11 nm. The effect of shell thickness on the thermoelectric properties of core–shell nanocomposites is investigated after sintering the core–shell nanoparticles into pellets using the spark plasma sintering (SPS) technique. The power factor was optimized by the synergetic effect of the improvement of Seebeck coefficient by energy filtering in the Au/Cu₂Se interface and the effective tuning of carrier concentration by Ohmic contact in the interface. The lattice thermal conductivity of core–shell nanocomposites is reduced by coherent phonon scattering, which is caused by the wavelike interference of phonons due to the phase shift in the core–shell interface. The highest ZT value of 0.61 is obtained at 723 K for Au–Cu₂Se core–shell nanocomposite with a shell thickness of 21 nm, which is higher than that of pure Cu₂Se nanocomposite or a mixture of Au and Cu₂Se particles.

更新日期：2020-08-12

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南