Optical properties of single‐walled carbon nanotubes filled with CuCl by gas‐phase technique

Abstract

Single-walled carbon nanotubes (SWCNTs) have unique electronic and optical properties, which are attractive in various applications. These properties can be further improved by functionalization. In this work, it is shown that filling nanotubes with CuCl leads to improvement of their electro-conductive and optical transmission properties up to outstanding level. The improvement is due to the significant p-type doping of the functionalized nanotubes. That leads to a huge increase in nanotubes charge carrier density and the considerable decrease of the nanotubes absorption via Pauli blocking. The functionalization was realized via a gas-phase filling of SWCNTs with CuCl. We demonstrate the effect of huge doping on optical properties of nanotubes with different average diameters. The observed sufficient stability of the CuCl@SWCNT composite is proved to be due to the formation of quasi-one-dimensional (1D) CuCl crystal inside nanotubes.AC-HRTEM image of 1D CuCl crystal formed inside SWCNT.

Optical Properties of Single‐Walled Carbon Nanotubes Doped in Acid Medium

“…Such phenomena are also widely detected for doped nanotubes [3,11] and are explained by depletion of Van-Hove singularities.…”

“…[2,3] These phenomena are commonly explained by the downshifting of the Fermi level of nanotubes into the valence band. To describe this process more completely, photoluminescence (PL) spectroscopy should be applied, but commonly used filling technique deals with films or powders of nanotubes, that makes PL studying complicated due to the fast irradiative relaxation of electronic excitations in bundles.…”

Phonon contribution to electrical resistance of acceptor-doped single-wall carbon nanotubes assembled into transparent films

“…[22,33] for the iodine-doped films, and in Ref. [34] for the CuCl-doped ones. The statistical estimation made by the HR-TEM showed up to 40% filling level of SWCNTs.…”

Characterization of the Electronic Properties of Single‐Walled Carbon Nanotubes Filled with an Electron Donor—Rubidium Iodide: Multifrequency Raman and X‐ray Photoelectron Spectroscopy Studies

“…The SWCNTs can be filled with different simple substances, chemical compounds, and molecules possessing appropriate chemical and physical properties. It was demonstrated that metals and some organic and organometallic molecules result in n‐doping of SWCNTs, whereas metal halogenides lead to p‐doping of nanotubes.…”

“…In the literature, there are reports on the studies of the electronic properties of SWCNTs filled with halogenides of 3d‐ (Mn, Fe, Co, Ni, Zn, Cu), 4d‐ (Ag, Cd), 5d‐ (Hg), and 4f‐metals (Tb, Pr, Tm) . The valuable experimental data on the modification of the electronic properties of SWCNTs due to the filling were obtained.…”