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Photoresponsive Thermoelectric Materials Derived from Fullerene‑C60 PEDOT Hybrid Polymers
journal contribution
posted on 2020-07-02, 22:43 authored by Hui Zhou, Yun Zheng, Xizu Wang, Hui Ru Tan, Jianwei XuA series
of fullerene-C60-PEDOT hybrid polymers HP1–7 with different contents of C60 were
successfully prepared and characterized in terms of
UV–vis absorption spectroscopy, thermogravimetric analysis
(TGA), X-ray diffraction (XRD), and transmission electron microscopy
(TEM). Poly(3,4-ethylenedioxythiophene) (PEDOT) chains were grafted
onto the surface of C60, where C60 was covalently
dispersed into the whole hybrid polymer network. The thermoelectric
(TE) properties of hybrid polymer films were investigated in the dark
condition and under visible light irradiation. In the dark condition,
the HP1 (0.00 wt % C60) films showed an electrical
conductivity (σ) of 240 ± 5 S cm–1 and
a Seebeck coefficient (S) of 10 ± 0.6 μV
K–1. By increasing the C60 content in
hybrid polymers, the σ gradually decreased to 70 ± 10 S
cm–1 (HP7, 5.00 wt % C60). In contrast, the S rapidly increased to 19 ±
0.5 μV K–1 (HP4, 1.00 wt % C60) and then reached 22 ± 1.0 μV K–1 for HP7. A maximum power factor (PF) of 5.8 ±
0.2 μW m–1 K–2 was achieved
for HP3 films with 0.50 wt % C60. Under light
irradiation, the S of HP2–4 were decreased from 13 ± 0.8, 17 ± 0.9, and 19
± 0.5 to 9 ± 0.4, 8 ± 0.6, and 12 ± 0.4 μV
K–1, respectively, leading to decreased PFs of 1.9
± 0.2, 1.5 ± 0.1, and 2.4 ± 0.2 μW m–1 K–2, respectively. HP3 exhibited
the highest light-inhibited efficiency of the TE property with its
PF of approximately one-fourth of that obtained under visible light
irradiation, revealing that the TE performance of these fullerene-C60-PEDOT hybrid polymers could be feasibly controlled by the
irradiation of the visible light.