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<p>This article examines the spark plasma sintering (SPS) of nitrogen-doped carbon nanotubes (N-CNTs), enabling the production of consolidated pellets with nitrogen contents of up to 1.6 at.%. The samples were analyzed using Raman spectroscopy, electron microscopy, thermal and elemental analysis, and X-ray photoelectron spectroscopy. For the first time, the heats of combustion <i>∆</i><sub>c</sub><i>U</i> and standard enthalpies of formation <i>∆</i><sub>f</sub><i>H</i><sup>0</sup><sub>298</sub> of these samples were determined via isothermal bomb calorimetry. The correlations between structure, physicochemical properties, composition, and <i>∆</i><sub>f</sub><i>H</i><sup>0</sup><sub>298</sub> are discussed. An increase in SPS temperature and/or pressure leads to a reduction in nitrogen content. Despite the presence of different nitrogen configurations within the structure, substitutional nitrogen was found to be the most stable. The standard enthalpies of formation for all samples were negative, indicating thermodynamic stability even after the complete elimination of nitrogen atoms from the N-CNT structure.</p>

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Nitrogen-doped carbon nanotubes consolidated by spark plasma sintering

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Evgeniya V. Suslova,
  • Roman V. Klimenko,
  • Serguei V. Savilov

摘要

This article examines the spark plasma sintering (SPS) of nitrogen-doped carbon nanotubes (N-CNTs), enabling the production of consolidated pellets with nitrogen contents of up to 1.6 at.%. The samples were analyzed using Raman spectroscopy, electron microscopy, thermal and elemental analysis, and X-ray photoelectron spectroscopy. For the first time, the heats of combustion ∆cU and standard enthalpies of formation ∆fH0298 of these samples were determined via isothermal bomb calorimetry. The correlations between structure, physicochemical properties, composition, and ∆fH0298 are discussed. An increase in SPS temperature and/or pressure leads to a reduction in nitrogen content. Despite the presence of different nitrogen configurations within the structure, substitutional nitrogen was found to be the most stable. The standard enthalpies of formation for all samples were negative, indicating thermodynamic stability even after the complete elimination of nitrogen atoms from the N-CNT structure.