Rapid, efficient, and non-destructive purification of single-walled carbon nanotube films from metallic impurities by Joule heating

Stepan A. Romanov, Alena A. Alekseeva, Eldar M. Khabushev, Dmitry V. Krasnikov, Albert G. Nasibulin

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    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 <1 wt%) after heating at 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.

    Original languageEnglish
    Pages (from-to)193-200
    Number of pages8
    JournalCarbon
    Volume168
    DOIs
    Publication statusPublished - 30 Oct 2020

    Keywords

    • In situ TEM heating
    • Iron removal
    • Kelvin effect
    • Purification
    • Single-walled carbon nanotubes
    • Thermoacoustics

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