具有高各向异性热电性能的氧化铜纳米粒子装饰的 PEDOT:PSS 和氮-石墨烯的铁磁复合材料,Journal of Materials Chemistry C

当前位置： X-MOL 学术 › J. Mater. Chem. C › 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.)

具有高各向异性热电性能的氧化铜纳米粒子装饰的 PEDOT:PSS 和氮-石墨烯的铁磁复合材料
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2023-01-10 , DOI: 10.1039/d2tc04287h
Ahmed Gamal El-Shamy ₁

Affiliation

尽管 PEDOT:PSS/石墨烯 (PP/GR) 热电 (TE) 系统具有高电导率 ( σ )，但它面临着高导热率 ( k ) 和相对较低的塞贝克系数 ( S ) 的巨大问题，这限制了它的应用TE 应用。因此，本工作引入了一种由 PEDOT:PSS 和氧化铜 (CuO) 纳米颗粒修饰的氮掺杂石墨烯 (PP/ ^CuO NG) 组成的新型复合材料，具有良好的各向异性 TE 性能，以解决这些限制。用氮掺杂石墨烯通过产生界面能垒和降低k在提高塞贝克系数 ( S )方面起着双重作用通过散射声子的价值。此外，CuO 在 NG 表面的修饰降低了 NG 层的堆叠性质，从而降低了k值。此外，CuO 纳米粒子的铁磁性能提供了高自旋塞贝克系数，提高了复合系统的S值。对于 CuO < 20 wt%，获得了各向异性 TE 函数的增加趋势，而对于 CuO > 20 wt%，在室温下观察到各向异性 TE 函数的大幅下降。有趣的是，各向异性的 TE 函数通过添加 CuO 得到显着改善，具有 20 wt% CuO 的复合材料的各向异性功率因数 PF (PF _‖ ∼ 180.62 ± 3 μW m ⁻¹ K ⁻²和 PF _⊥∼ 106.52 ± 4 μW m ⁻¹ K ⁻² ) 比 PP/GR 提高了 ∼550% (PF _‖ ∼ 32.35 ± 2 μW m ⁻¹ K ⁻² , PF _⊥ ∼ ¹ 8 ^.2 3 ± 3 μW m ^{− 1} K ^-2）。此外，对于 20 wt% CuO，复合材料在室温下显示k _‖ ∼ 0.31 ± 0.045 W m ⁻¹ K ⁻¹和k _⊥ ∼ 0.27 ± 0.060 W m ⁻¹ K ⁻¹，比 PP/ 小 >2.8 倍GR ( k _‖ ∼ 0.87 ± 0.04 W·m ⁻¹ K ⁻¹k _⊥ ∼ 0.606 ± 0.07 W m ⁻¹ K ⁻¹ )。因此，优化后的薄膜在室温下显示出较大的各向异性品质因数zT（zT _‖ ∼ 0.175 ± 0.004 和zT _⊥ ∼ 0.118 ± 0.003），这是 PP/GR 的 13 倍以上（zT _‖ ∼ 0.011 ± 0.003和zT _⊥ ∼ 0.009 ± 0.005)。本研究提出了简单、安全、经济和有效的 TE 复合材料，具有良好的 TE 性能，可潜在应用于 TE 发电机、温度传感器和自旋电子学。

"点击查看英文标题和摘要"

A ferromagnetic composite of PEDOT:PSS and nitrogen-graphene decorated with copper oxide nanoparticles with high anisotropic thermoelectric properties

Although the PEDOT:PSS/graphene (PP/GR) thermoelectric (TE) system has a high electrical conductivity (σ), it faces great issues regarding its high thermal conductivity (k) and its relatively low Seebeck coefficient (S) which restrict its TE applications. Therefore, a new composite of PEDOT:PSS and copper oxide (CuO) nanoparticle decorated nitrogen doped graphene (PP/^CuONG) has been introduced in this work with a good anisotropic TE performance in order to solve these limitations. Doping of graphene with nitrogen plays a dual role in improving the Seebeck coefficient (S) by creating interfacial energy barriers and decreasing the k value by scattering the phonons. Besides, the adornment of CuO on the NG surface reduces the stacking nature of NG layers and hence decreasing the k value. Moreover, the ferro-magnetic performance of CuO nanoparticles provides a high spin Seebeck coefficient which improves the S value of the composite systems. For CuO < 20 wt%, an increasing trend in anisotropic TE functions is obtained, whereas a great drop in anisotropic TE functions is observed at R.T for CuO > 20 wt%. Interestingly, the anisotropic TE functions are significantly improved by the CuO addition, with the anisotropic power factors PF of the composite with 20 wt% CuO (PF_‖ ∼ 180.62 ± 3 μW m⁻¹ K⁻² and PF_⊥ ∼ 106.52 ± 4 μW m⁻¹ K⁻²) showing a ∼550% improvement over PP/GR (PF_‖ ∼ 32.35 ± 2 μW m⁻¹ K⁻², PF_⊥ ∼ ¹8^.23 ± 3 μW m⁻¹ K⁻²). Furthermore, the composite displays k_‖ ∼ 0.31 ± 0.045 W m⁻¹ K⁻¹ and k_⊥ ∼ 0.27 ± 0.060 W m⁻¹ K⁻¹ at RT for 20 wt% CuO which is >2.8 times smaller than that of PP/GR (k_‖ ∼ 0.87 ± 0.04 W m⁻¹ K⁻¹ and k_⊥ ∼ 0.606 ± 0.07 W m⁻¹ K⁻¹). Accordingly, the optimized film displays a large anisotropic figure of merit zT (zT_‖ ∼ 0.175 ± 0.004 and zT_⊥ ∼ 0.118 ± 0.003) at R.T, which is >13 times larger than that of PP/GR (zT_‖ ∼ 0.011 ± 0.003 and zT_⊥ ∼ 0.009 ± 0.005). This study presents simple, safe, economic, and effective TE composites with promising TE performance which can be potentially applied in TE generators, temperature sensors and spintronics.

更新日期：2023-01-10

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>