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Teng et al. Microstructures 2023;3:2023019 https://dx.doi.org/10.20517/microstructures.2023.07 Page 13 of 29

Figure 6. OAS characterization of CNT nanopeapods: (A) OAS of SWCNTs and AgX@SWCNTs (X = Cl, Br, I) (Reproduced with
[102] [103]
permission . Copyright 2010, Elsevier). (B) OAS of SWCNTs and CuX@SWCNTs (X = Cl, Br, I) (Reproduced with permission .
[116]
Copyright 2012, Elsevier). (C) OAS of SWCNTs and CdX @SWCNTs (X = Cl, Br, I) (Reproduced with permission . Copyright 2013,
2
[115]
Springer Nature). (D) OAS of SWCNTs and FeX @SWCNTs (X = Cl, Br, I) (Reproduced with permission . Copyright 2009, Springer
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Nature).
singularities after filling. Notably, the trend of E and E peaks was positively correlated with the electron
M
S
11
22
negativity of halogen atoms (Cl > Br > I) . This phenomenon is most obvious in the CuX@SWCNT and
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FeX @SWCNT systems.
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Raman spectroscopy
Raman scattering is a kind of inelastic scattering that occurs when incident light interacts with phonons,
and its intensity is typically only one-thousandth of Rayleigh scattering . The energy difference between
[122]
the scattered light and the incident light can be used to judge the lattice vibration information of carbon
nanotubes . Transition metal halide (MX)@CNTs were studied by Raman spectroscopy, such as MnCl,
[122]
[102]
MnBr 2 [123] , CoBr 2 [114] , NiCl, NiBr 2 [124] , ZnCl , ZnX 2 [104] , FeX 2 [115] , AgX , CuX (X = Cl, Br, I), rare earth
[103]
[104]
metal halide, TbBr , TbI 3 [125] , CdCl 2 [126] , LuCl , LuI 3 [126] , GaSe, GaTe , SnS, SnTe , Ag , Cu, Ni , and
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[79]
[127]
[119]
3
3
other complexes.