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Teng et al. Microstructures 2023;3:2023019 https://dx.doi.org/10.20517/microstructures.2023.07 Page 17 of 29

Figure 9. Electrical characterization of fullerene-peapods FETs: (A) Transfer curves for a pristine (unfilled) SWCNT FET and a C
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nanopeapods FET device (Reproduced with permission . Copyright 2010, American Chemical Society). (B) Transfer curves measured
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for C N nanopeapods FET (Reproduced with permission . Copyright 2010, American Chemical Society). (C) I -V characteristics
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measured at room temperature for an n-type semiconducting C N@SWCNT and a metallic C N@SWCNT without light (V = 0.1 V).
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The inset shows the I characteristic of the semiconducting C N@SWCNT, which is measured as a function of time without and with
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incident light (400 nm wavelength) (Reproduced with permission . Copyright 2009, American Chemical Society). (D) Transfer
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characteristics of C , C , and Dy@C -peapods (V = 20 mV, T = 23 K) (Reproduced with permission . Copyright 2003, Elsevier).
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(E) V dependence of conductance measured at various temperatures (V = 4) (Reproduced with permission . Copyright 2001, AIP
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Publishing). (F) Conductance of Dy@C -peapods at temperatures from 4 to 215 K. The insets in (E) and (F) are band diagrams
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(Reproduced with permission . Copyright 2001, AIP Publishing).
with the functional properties of the CNT [Figure 10] . At low temperatures, due to the molecule
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orientation of the SMM molecule arrangement inside the CNTs, the electrical resistance of the host CNTs
exhibited anisotropic behavior. Villalva et al. synthesized the Fe-based SCO molecules filled SWCNTs
heterostructures (Fe-SCO@SWCNT). The electronic transport measurements indicated that the SCO switch
of the molecules triggers large conductance bistability via the SWCNT .
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In the above, various nanoelectronic devices suggested that the filled CNT is an effective method for tuning
and extending the function of pristine SWCNT.
Energy
Lithium-ion battery
Filling CNTs with suitable materials can increase their practical capacity, and their electrochemical
properties are very suitable for battery preparation. Yu et al. tested the battery performance of FeS@CNTs
[Figure 11A] . The battery was stable over multiple cycles, with higher cycle stability per cycle than
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graphite and FeS batteries. Another paper demonstrated that even after one thousand cycles at a highly
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charged current of 2,000 mA g , the FeS @CNTs battery could achieve a specific capacity of 525 mAh g .
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