Xiaoliang Ma, Yusheng Wang, Chi Wang, Yunfei Zhang*, Ping Fu and Feipeng Du*,
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引用次数: 0
摘要
基于单壁碳纳米管(SWCNT)的柔性热电薄膜具有良好的导电性(σ)和高柔韧性,因此在可穿戴电子设备中具有潜在的应用前景。然而,较低的塞贝克系数(S)极大地限制了它们在热电领域的应用。无机氮化硼纳米片的高 S 值有望弥补 SWCNT 的低 S 值。在这项工作中,首先通过溶解热剥离六方氮化硼(h-BN)制备出剥离氮化硼纳米片(EBNS),然后通过简单的混合和过滤方法将其与 SWCNT 复合,制备出具有更好热电性能的自支撑 EBNS/SWCNT 薄膜。在这里,EBNS/SWCNT 界面的能量过滤效应显著提高了薄膜的 S 值。结果表明,当 EBNS/SWCNT 的质量比为 7.5% 时,EBNS/SWCNT 在室温下的最大 S 值为 50.6 μV K-1,最大功率因数 (PF) 为 116.1 μW m-1 K-2。最后,将六对 p 型 EBNS/SWCNT 薄膜和 n 型铜片串联,组装成一个自供电热电装置,在 60 K 的温差下,该装置的开路电压为 8.1 mV,输出功率为 550 nW。
Enhanced Thermoelectric Properties of Exfoliated BN Nanosheets/Single-Walled Carbon Nanotube Composite Films for Applications in Flexible Electronics
Single-walled carbon nanotube (SWCNT)-based flexible thermoelectric films exhibit potential application in wearable electronics due to their good electrical conductivity (σ) and high flexibility. Nevertheless, the low Seebeck coefficient (S) greatly limits their thermoelectric application. The high S of inorganic boron nitride nanosheets is expected to make up for the low S of SWCNT. In this work, exfoliated boron nitride nanosheets (EBNS) are first prepared by solvothermal exfoliation of hexagonal boron nitride (h-BN), which are composited with SWCNT through a simple mixing and filtration method to prepare self-supporting EBNS/SWCNT films with improved thermoelectric properties. Here, the energy filtering effect at the EBNS/SWCNT interface significantly improves the S values of the films. The results show that the maximum S of the EBNS/SWCNT at room temperature is 50.6 μV K–1 and the maximum power factor (PF) is 116.1 μW m–1 K–2 at the EBNS/SWCNT mass ratio of 7.5%. Finally, six pairs of p-type EBNS/SWCNT films and n-type copper sheets are connected in series to assemble a self-powered thermoelectric device, which demonstrates an open-circuit voltage of 8.1 mV and an output power of 550 nW under a temperature difference of 60 K. Therefore, this work provides a simple and effective method to improve the performance of carbon nanotube-based thermoelectric materials.
期刊介绍:
ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.