The foundations of the electronic structures of single-walled carbon nanotubes (SWCNTs) are studied for applications in water treatment. The SWCNTs have metallic and semiconducting physical properties. To improve the functionality of the SWCNTs, they are filled [1-4]. The methods of improving the functionality of the SWCNTs include surface functionalization and filling. In this contribution, the semiconducting SWCNTs were filled with silver chloride (AgCl). Silver chloride is an electron acceptor. The filling of AgCl in the SWCNTs causes strong Fermi level variations. Raman spectroscopy proved the doping-mediated differences in the electronic structures of the pristine and the filled SWCNTs. The physical properties of the different-diameter SWCNTs were modulated in a different manner with the filling. This was demonstrated with the radial breathing band, and the G-band of Raman spectra. The observed differences were the different locations of the peaks, the variations in the intensities, and the disappearance of the peaks. The detected modulations of the electronic structure of the SWCNTs are useful in the water treatment.

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