Charge transfer in single-walled carbon nanotubes filled with cadmium halogenides

摘要

In this work the internal channels of the singlewalled carbon nanotubes (SWCNTs) were filledwith cadmium chloride, cadmiumbromide, and cadmium iodide by a capillary method usingmelts of these salts.The influence of incorporated chemical compounds on the electronic properties of the carbon nanotubeswas investigated by optical absorption spectroscopy, Raman spectroscopy, near edge X-ray absorption fine structure spectroscopy, and X-ray photoelectron spectroscopy. It was found that there is the chemical bonding between carbon atoms of nanotube walls and metal atoms of encapsulated CdX2 nanocrystals. The obtained data testify acceptor doping effect of cadmium halogenides incorporated into the SWCNT channels, which is accompanied by the charge transfer from nanotube walls to introduced substances.