fig12
![Filled carbon-nanotube heterostructures: from synthesis to application](https://image.oaes.cc/0ad4e56a-b1e2-4681-9552-28365b898cdf/5560.fig.12.jpg)
Figure 12. Properties of CNTs-filled in a thermoelectric generation (Reproduced with permission[149]. Copyright 2017, Springer Nature): (A) Schematic diagram of measuring equipment. (B) TEM photos of measuring device details. (C and D) The relationship between κ and S of CNTs and temperature after filling C60, Gd@C82, and Er2@C82.