Single-walled carbon nanotube (SWCNT) transparent conducting films (TCFs) are attracting increasing attention due to their exceptional optoelectronic properties. Toluene is a proposed carbon source for SWCNT synthesis, but the growth parameters of SWCNTs and their TCF optoelectronic performance (i.e., sheet resistance versus transmittance) have been insufficiently evaluated. Here, we have for the first time reported a systematic study of the fabrication of high-performance SWCNT TCFs using toluene alone as the carbon source. The mechanisms behind each observed phenomenon were elucidated using optical and microscopy techniques. By optimizing the growth parameters, high yields of SWCNT TCFs exhibiting a considerably low sheet resistance of 57 Ω/sq at 90% transmittance were obtained. This competitive optoelectronic performance is mainly attributable to long SWCNT bundles (mean length is 41.4 μm) in the film. Additionally, a chirality map determined by electron diffraction displays a bimodal distribution of chiral angles divided at 15°, which is close to both armchair and zigzag edges. Our study paved the way towards scaled-up production of SWCNTs for the fabrication of high-performance TCFs for industrial applications.

中文翻译：

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仅由甲苯合成的长单壁碳纳米管的高性能透明导电膜

单壁碳纳米管（SWCNT）透明导电膜（TCF）由于其卓越的光电性能而受到越来越多的关注。甲苯是一种用于碳纳米管合成的碳源，但是碳纳米管的生长参数及其TCF光电性能（即薄层电阻与透射率）尚未得到充分评估。在这里，我们首次报道了仅使用甲苯作为碳源来制备高性能SWCNT TCF的系统研究。使用光学和显微镜技术阐明了每个观察到的现象背后的机制。通过优化生长参数，可以获得高产率的SWCNT TCF，在90％的透射率下，其薄层电阻仅为57Ω/ sq。这种具有竞争力的光电性能主要归因于薄膜中的长SWCNT束（平均长度为41.4μm）。另外，通过电子衍射确定的手性图显示了以15°划分的手性角的双峰分布，该分布接近扶手椅和锯齿形边缘。我们的研究为大规模生产用于工业应用的高性能TCF的SWCNT铺平了道路。