基于水相剥离的单壁碳纳米管薄膜透光和导电特性

doi:10.11949/0438-1157.20240135

摘要/Abstract

摘要：

高性能透明导电薄膜是光伏电池、平板显示器等光电子器件的重要组成部件。发展了基于水相剥离的单壁碳纳米管透光导电薄膜制备方法，分析单壁碳纳米管薄膜透光率、方阻和浓度之间的依变关系，探究杂化处理对薄膜透光和导电性能的影响规律。结果表明：通过调节单壁碳纳米管浓度实现了薄膜在太阳光谱范围（300~2500 nm）透光率（50%~96%）的准确预测、方阻特性在3~100 Ω·sq^-1之间的精准调控；通过酸回流和强氧化的纯化过程，透光率在750~2000 nm波段平均提升3.1%，方阻降低50%以上。该透明导电薄膜具有高透光率和低电阻的优异综合性能，在光电子器件设计方面具有广阔的应用前景。

关键词: 单壁碳纳米管, 膜, 透光导电, 水相剥离, 过滤, 纳米材料

Abstract:

High-performance transparent conductive films are important components of optoelectronic devices such as photovoltaic cells and flat panel displays. This study introduces a novel method for fabricating single-walled carbon nanotube transparent conductive films via water-phase exfoliation. The interdependence among transmittance, sheet resistance, and SWCNT concentration in the films is explored. Additionally, the impact of hybrid treatments on film transmittance and conductivity is examined. The results demonstrated accurate predictions of the films' transmittance (ranging from 50% to 96%) within the solar spectrum (300—2500 nm). Precise control over sheet resistance characteristics, ranging from 3 Ω·sq^-1 to 100 Ω·sq^-1, was achieved by adjusting the concentration of single-walled carbon nanotubes. Through the purification process of acid reflux and strong oxidation, the light transmittance increased by an average of 3.1% in the 750—2000 nm band, and the sheet resistance was reduced by more than 50%. These transparent conductive films demonstrate excellent overall performance, characterized by high transmittance and low resistance, thereby presenting extensive prospects for the advancement of optoelectronic devices.

Key words: single-walled carbon nanotubes, film, transmittance and conductive, water-phase exfoliation, filtration, nanomaterials

中图分类号:

TB 383.2

白炳林, 杜燊, 李明佳, 张传琪. 基于水相剥离的单壁碳纳米管薄膜透光和导电特性[J]. 化工学报, 2024, 75(7): 2680-2687.

Binglin BAI, Shen DU, Mingjia LI, Chuanqi ZHANG. Optical transmittance and electrical conductivity characteristics of single-walled carbon nanotube films based on water-phase exfoliation method[J]. CIESC Journal, 2024, 75(7): 2680-2687.

图/表 9

图1 基于抽滤和水相剥离相结合的SWCNT薄膜合成方法

Fig.1 SWCNT thin film synthesis method based on a combination of filtration and water-phase exfoliation

图2 SWCNT薄膜的光学照片（a）、 SEM照片（b）和具有碳焊结构的SWCNT网络（c）

Fig.2 Optical image (a) and SEM image (b) of SWCNT thin film and SWCNT network with carbon welding structure (c)

图3 薄膜太阳光谱透光特性（a）及薄膜在550 nm波段透光特性（b）

Fig.3 Solar spectral transmittance characteristics of SWCNT thin films (a) and transmittance characteristics of SWCNT thin films at 550 nm (b)

图4 不同透光率SWCNT薄膜视觉效果对比

Fig.4 Comparison of visual effects of SWCNT thin films with different transmittance

图5 杂化处理前后（a）和120℃高温处理前后（b）SWCNT薄膜透光率对比

Fig.5 Comparison of transmittance before and after hybridization treatment (a) and high-temperature treatment at 120℃ (b)

图6 杂化处理前后SWCNT薄膜导电特性的对比

Fig.6 Comparison of conductivity characteristics of SWCNT thin films before and after hybridization treatment

图7 不同厚度SWCNT薄膜导电特性的对比

Fig.7 Comparison of conductivity characteristics of SWCNT thin films with different thicknesses

图8 SWCNT浓度与薄膜透光率、方阻、厚度之间的关系

Fig.8 Relationship between transmittance, conductivity, thickness and SWCNT concentration

图9 SWCNT薄膜透光和导电性能与文献的对比

Fig.9 Comparison of optical transmission and electrical conductivity of SWCNT thin films with literatures

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