fig6
![Filled carbon-nanotube heterostructures: from synthesis to application](https://image.oaes.cc/0ad4e56a-b1e2-4681-9552-28365b898cdf/5560.fig.6.jpg)
Figure 6. OAS characterization of CNT nanopeapods: (A) OAS of SWCNTs and AgX@SWCNTs (X = Cl, Br, I) (Reproduced with permission[102]. Copyright 2010, Elsevier). (B) OAS of SWCNTs and CuX@SWCNTs (X = Cl, Br, I) (Reproduced with permission[103]. Copyright 2012, Elsevier). (C) OAS of SWCNTs and CdX2@SWCNTs (X = Cl, Br, I) (Reproduced with permission[116]. Copyright 2013, Springer Nature). (D) OAS of SWCNTs and FeX2@SWCNTs (X = Cl, Br, I) (Reproduced with permission[115]. Copyright 2009, Springer Nature).