Nitrogen doping of carbon nanomaterials has emerged as a method to develop novel material properties, though limitations in the form of extended treatment times, harsh chemical usage and limited total nitrogen content exist. Here, macroscopic ribbon-like assemblies of carbon nanotubes are functionalized with nitrogen using a simple direct current-based plasma–liquid system. This system utilizes the plasma-generated species in an ethanol:water solution with ethylenediamine as a nitrogen precursor for the nitrogen functionalization of the carbon nanotube assembly. These unique, plasma-generated species and pathways enable rapid and high levels of functionalization with the atomic concentration of nitrogen reaching 22.5%, with amine groups, pyrrolic groups and graphitic nitrogen observed in the X-ray photoelectron spectra, the highest ever achieved. This nitrogen content is demonstrated to be significantly higher than a comparative electrolysis process. This demonstrates that this plasma process enhances the availability of nitrogen from the ethylenediamine precursor, facilitating greater functionalization.
|Number of pages||12|
|Journal||Journal of Materials Science|
|Early online date||15 Jul 2022|
|Publication status||Published (in print/issue) - 31 Jul 2022|
Bibliographical noteFunding Information:
The authors would like to acknowledge the EPRSC for supporting this work through EP/M015211/1 and EP/R008841/1.
© 2022, The Author(s).
- Chemical Routes to Materials
- Chemical routes to materials