The formation and properties of one-dimensional FeHal2 (Hal = Cl, Br, I) nanocrystals in channels of single-walled carbon nanotubes

One-Dimensional Crystals inside Single-Walled Carbon Nanotubes: Growth, Structure and Electronic Properties

“…Acceptor doping of SWNT Acceptor doping of the SWNTs can be performed by filling nanotubes with a number of inorganic substances, i.e. Se, Te ), FeCl 3 (De Blauwe et al, 2009Liu et al, 2004a), FeCl 2 , FeBr 2 , FeI 2 (Kharlamova et al, 2009), AgCl, AgBr, AgI , CuCl, CuBr, CuI , CoBr 2 etc. Acceptor doping causes a corresponding shift of the C 1s line towards lower BEs in XPS, the upshift of the G-mode in the Raman spectra and the appearance of a new empty state in the NEXAFS C 1s spectra (Fig.…”

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

“…The list includes C 60 [357], Gd@C 82 [49,256] [304] and GaSe [328] ( Table 2). In case of the nanotubes filled with halogenides of silver [306], iron [310], nickel [312], zinc [314] and cadmium [316], a new peak located at lower energies as compared to the *-resonance emerged in the C 1s XAS spectra, as it was discussed above for the copper halogenide-filled SWCNTs. In these studies it was also concluded that new localized states in the band structure of filled SWCNTs were formed due to the hybridization of carbon -orbitals with the incorporated substances.…”

“…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].…”

“…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].…”