Abstract We demonstrate a simple and resource-efficient approach for rapid purification of single-walled carbon nanotube (SWCNT) films from catalyst impurities by Joule heating in a vacuum. As a result, the catalyst concentration decreases by a factor of 27 (from 17 to 1600 °C for 2 min. Moreover, the nanotube structure remains almost intact as the purified films show a high ratio of intensities of G to D bands of Raman spectrum IG/ID = 180. The technique perfectly fits for the devices based on free-standing carbon nanotube films such as protective membranes, infrared detectors, and sound generators. For purified SWCNT films, we show the signal-to-noise ratio for the bolometers to increase by a factor of 2.5 and 24% sound pressure gain for the air-coupled thermophones. The method can be easily extended to other applications, for instance, the SWCNT-based devices of limited liquid and harsh reagent tolerance like nanotube aerogels and drug delivery systems.

中文翻译：

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通过焦耳加热快速、高效、无损地从金属杂质中纯化单壁碳纳米管薄膜

摘要 我们展示了一种简单且资源高效的方法，通过在真空中通过焦耳加热从催化剂杂质中快速纯化单壁碳纳米管 (SWCNT) 薄膜。结果，催化剂浓度降低了 27 倍（从 17 到 1600°C 持续 2 分钟。此外，纳米管结构几乎保持完整，因为纯化的薄膜显示出拉曼光谱 G 和 D 带的高强度比IG/ID = 180。该技术非常适合基于独立式碳纳米管薄膜的设备，例如保护膜、红外探测器和声音发生器。对于纯化的 SWCNT 薄膜，我们显示了辐射热计的信噪比将空气耦合热电偶的声压增益提高 2.5 倍和 24%。该方法可以轻松扩展到其他应用，例如，