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<p>Carbon nanotubes (CNTs) possess excellent adsorption, conductivity, and structural properties, making them outstanding materials for gas sensing. We developed a low-pressure gas sensing technology based on the field emission enhancement effect of CNTs by gas adsorptions. This study investigates the relationship between the structure and crystallinity of multi-walled CNTs (MWCNTs) and their nitrogen sensing performance. By adjusting the catalytic metal ratio and morphology of the CVD growth substrate, MWCNT field emission films with diverse structures were obtained. Experiments revealed an inverse relationship between MWCNT diameter and crystallinity. However, the CNTs of smallest diameter exhibited the fewest defects and closed tip structures predominantly, demonstrating the best nitrogen sensing performance. Therefore, Raman crystallinity cannot serve as the sole parameter for assessing CNT defect levels and sensing performance, and the defect density and distribution, particularly the tip structure, plays a more critical role.</p>

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Structural characterizations of MWCNTs for low pressure nitrogen sensing

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Siyu Lu,
  • Ruikai Li,
  • Weijun Huang,
  • Changkun Dong

摘要

Carbon nanotubes (CNTs) possess excellent adsorption, conductivity, and structural properties, making them outstanding materials for gas sensing. We developed a low-pressure gas sensing technology based on the field emission enhancement effect of CNTs by gas adsorptions. This study investigates the relationship between the structure and crystallinity of multi-walled CNTs (MWCNTs) and their nitrogen sensing performance. By adjusting the catalytic metal ratio and morphology of the CVD growth substrate, MWCNT field emission films with diverse structures were obtained. Experiments revealed an inverse relationship between MWCNT diameter and crystallinity. However, the CNTs of smallest diameter exhibited the fewest defects and closed tip structures predominantly, demonstrating the best nitrogen sensing performance. Therefore, Raman crystallinity cannot serve as the sole parameter for assessing CNT defect levels and sensing performance, and the defect density and distribution, particularly the tip structure, plays a more critical role.