Lead halides in single-walled carbon nanotubes

Single-walled carbon nanotubes (SWCNTs) were filled with various materials. Metal halides are the most popular group of filled materials. Among them are 3d, 4d, and 4f metal halides, such as iron halides [1], cadmium halides [2], and terbium halides [3]. In this work, we filled SWCNTs with novel 6p metal halides, lead chloride, lead bromide, and lead iodide. The novelty of this work is the new incorporated materials, which were filled in SWCNTs with a diameter of 1.4 nm. Indeed, we filled SWCNTs with three materials with various properties, and we investigated the filling and electronic properties of the lead halide-filled SWCNTs. The aim of this work was to analyze the filling ratios, microstructure, chemical composition, and electronic properties of lead halide-filled SWCNTs. The investigation methods were scanning transmission electron microscopy (STEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). STEM showed the filling of the SWCNTs, and XPS confirmed the chemical composition of the lead halide-filled SWCNTs. Raman spectroscopy at different laser wavelengths between 458 and 647 nm showed variations in the properties of the lead halide-filled SWCNTs. In the radial breathing mode and G-band, the components showed shifts, which indicated doping. The C 1s XPS data confirmed the p-doping of the filled SWCNTs. The obtained data are necessary for nanoelectronic applications of the filled SWCNTs.

[1] М. V. Kharlamova et al. Russian Nanotechnologies, 2009, 4(9-10), 77-87.

[2] M. V. Kharlamova et al., Journal of Materials Science, 2013, 48(24), 8412-8419.

[3] M. V. Kharlamova et al., Applied Physics A, 2017, 123(4), 239.