Abstract Transparent conductive films (TCFs) made of single-walled carbon nanotubes (SWCNTs) are usually fabricated using highly pure SWCNTs. Obtaining pure SWCNTs is an important step for harnessing their excellent electrical properties. Herein, we studied the effect of purification of SWCNTs by thermal and acid processes on the electrical properties of TCFs. These purification processes also affected the length and diameter of the SWCNT bundles. The purity of SWCNTs was determined by UV–visible-near-infrared spectroscopy and the metal content by thermogravimetric analysis. TCFs were made by spraying aqueous suspensions of SWCNTs having different purities onto polyethylene terephthalate substrates, and the ratios of dc to optical conductivities of the films were compared. Thermally purified (TP) SWCNT TCFs had a higher ratio than thermally and acid-purified (TAP) ones even though the purity of the TP-SWCNTs was lower than that of the TAP-SWCNTs. The conducting paths of the SWCNT bundle networks in the TP-SWCNT TCFs were well organized, because nanosized graphitic nanoparticles and metal catalysts occupied the spaces between the CNT bundles or networks without hindering the network connections. Although the SWCNT purity affected the conductivity of the SWCNT TCFs, the network property of lower junction resistance with smaller bundle diameter was more influential on film conductivity.

中文翻译：

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纯化对单壁碳纳米管制备透明导电薄膜电性能的影响

摘要 由单壁碳纳米管 (SWCNTs) 制成的透明导电薄膜 (TCFs) 通常使用高纯度的 SWCNTs 制造。获得纯单壁碳纳米管是利用其优异电性能的重要一步。在此，我们研究了通过热和酸工艺纯化 SWCNT 对 TCF 电性能的影响。这些纯化过程也影响了 SWCNT 束的长度和直径。SWCNT 的纯度通过紫外-可见-近红外光谱测定，金属含量通过热重分析测定。TCFs 是通过将不同纯度的 SWCNTs 的水悬浮液喷涂到聚对苯二甲酸乙二醇酯基材上制成的，并比较了薄膜的直流电导率与光导率的比值。尽管 TP-SWCNT 的纯度低于 TAP-SWCNT，但热纯化 (TP) SWCNT TCF 的比率高于热和酸纯化 (TAP) 的 TCF。TP-SWCNT TCF 中 SWCNT 束网络的导电路径组织良好，因为纳米级石墨纳米粒子和金属催化剂占据了 CNT 束或网络之间的空间，而不会阻碍网络连接。尽管 SWCNT 纯度影响了 SWCNT TCF 的导电性，但具有较小束直径的较低结电阻的网络特性对薄膜导电性的影响更大。因为纳米级石墨纳米粒子和金属催化剂占据了 CNT 束或网络之间的空间，而不会阻碍网络连接。尽管 SWCNT 纯度影响了 SWCNT TCF 的导电性，但具有较小束直径的较低结电阻的网络特性对薄膜导电性的影响更大。因为纳米级石墨纳米粒子和金属催化剂占据了 CNT 束或网络之间的空间，而不会阻碍网络连接。尽管 SWCNT 纯度影响了 SWCNT TCF 的导电性，但具有较小束直径的较低结电阻的网络特性对薄膜导电性的影响更大。