Nickelocene-Filled Purely Metallic Single-Walled Carbon Nanotubes: Sorting and Tuning the Electronic Properties

Marianna V Kharlamova

doi:10.3390/nano11102500

Nickelocene-Filled Purely Metallic Single-Walled Carbon Nanotubes: Sorting and Tuning the Electronic Properties

Nanomaterials (Basel). 2021 Sep 26;11(10):2500. doi: 10.3390/nano11102500.

Author

Marianna V Kharlamova^{1

2}

Affiliations

¹ Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/BC/2, 1060 Vienna, Austria.
² Moscow Institute of Physics and Technology, Institutskii Pereulok 9, 141700 Dolgoprudny, Russia.

Abstract

We conducted the filling of single-walled carbon nanotubes (SWCNTs) with nickelocene molecules and separation of the filled SWCNTs by conductivity type by density-gradient ultracentrifugation. We tailored the electronic properties of nickelocene-filled purely metallic SWCNTs by thermal treatment in high vacuum. Our results demonstrated that annealing at low temperatures (360-600 °C) leads to n-doping of SWCNTs, whereas annealing at high temperatures (680-1200 °C) results in p-doping of SWCNTs. We found a correlation between the chemical state of the incorporated substances at different annealing temperatures and its influence on the electronic properties of SWCNTs.

Keywords: Raman spectroscopy; X-ray photoelectron spectroscopy; electronic properties; nickelocene; single-walled carbon nanotube.