The impact of dimensionality and stoichiometry of CuBr on its coupling to sp-carbon

Advances in tailoring the electronic properties of single-walled carbon nanotubes

“…Figure 24a shows the OAS spectra of the pristine nanotubes with a mean diameter of 1.4 nm and the SWCNTs filled with terbium, zinc and cadmium chlorides [317]. In the spectra of nanotubes filled with terbium, zinc and cadmium chlorides ( E peak was also observed in the spectra of nanotubes filled with halogenides of iron [310], cobalt [311], nickel [312], manganese [313], zinc [314], silver [306], cadmium [316] and copper [307].…”

“…However, ambipolar electrochemical charging of SWCNTs showed that applying the positive potentials to the nanotubes, which is analogues to donor doping, may also lead to hardening of the G-band [371]. That is why the conclusions about the direction of charge transfer in later reports [306,307,[310][311][312][313][314][315][316][317]328] were no longer exclusively drawn from Raman spectroscopy ( Table 2). The charge transfer from the nanotube walls to the incorporated substances and shift of the SWCNT Fermi level was determined as a result of analysis of the C 1s Xray photoelectron spectra of nanotubes filled with Gd@C 82 molecules [49,256], erbium chloride [304], halogenides of silver [306], cadmium [316,317], copper [307], iron [310], nickel [312], manganese [313], zinc [314,317], cobalt bromide [311], terbium chloride [317], thulium chloride [315] and gallium selenide [315,328], and comparison of the spectra of filled nanotubes with the spectrum of pristine SWCNTs, which is a 98 narrow peak with the maximum at 284.65 eV binding energy and the FWHM of 0.4 eV [79] ( Table 2).…”

“…In case of the SWCNTs filled with halogenides of silver [306], copper [307], iron [310], nickel [312], manganese [313], zinc [314,317] and cadmium [316,317], cobalt bromide [311], terbium chloride [317], thulium chloride [315] and gallium selenide [315,328] the C 1s spectra were separated into several components. Figures 25a,b show the C 1s XPS spectra of the pristine and cadmium chloride-filled SWCNTs [316].…”

“…The spectrum of the filled nanotubes is separated into three components. In case of copper halogenide-filled SWCNTs, the same conception was used for fitting the C 1s XPS spectra [307]. But measuring the spectra with high resolution allowed to single out the components corresponding to semiconducting and metallic XPS spectra of purely metallic or semiconducting SWCNTs were reported in Ref.…”

“…Its modeled structure was represented as a column of hexagonal closely-packed (Br) 3n triangles with the copper cations located either in tetrahedral or octahedral positions [307]. The estimated filling degree of SWCNTs with CuBr and its crystallization factor amounted to 60% and 50%, respectively [307].…”