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Tuning electronic properties of carbon nanotubes by nitrogen grafting: Chemistry and chemical stability

The effect of adding nitrogen atoms via plasma treatment on the electronic properties of both v-CNT tips and sidewalls has been investigated by using ultraviolet and X-ray photoemission spectroscopy and spectromicroscopy. Site selective nitrogen grafting near the tips, up to a depth of 4mm, was evaluated, beyond which the properties of the v-CNTs remain unperturbed.
Scardamaglia M, Carbon, Vol. 83, pp. 118-127 (2015).

In this work the effect of the nitrogen doping of carbon nanotubes by means of a post synthesis plasma treatment has been investigated by using advanced photoemission spectromicroscopy. Thanks to the nanoscale spatial resolution achieved by the scanning photoelectron microscope we were able to investigate the side walls of the nitrogen doped nanotubes, where the pyrrolic-N is practically absent, confirming its origin from the intrinsic disorder present at the v-CNT closed tips. We evaluated the nitrogen grafting region which extends in a few mm from the tips, leaving the other whole length of the nanotubes unperturbed. The tuning of the nitrogen bonding configuration by

means of temperature treatments allows a continuous tuning of the density of states at the Fermi level region, which makes this nitrogen doping strategy appealing for field emission applications.

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Tuning electronic properties of carbon nanotubes by nitrogen grafting: Chemistry and chemical stability, Scardamaglia M, Struzzi C, Aparicio Rebollo FJ, De Marco P, Mudimela PR, Colomer J, Amati M, Gregoratti L, Petaccia L, Snyders R, Bittencourt C, Carbon, Vol. 83, pp. 118-127 (2015)

 

Last Updated on Thursday, 07 October 2021 18:34