Preparation and Thermoelectric Properties of Composites Based on Polythiophene Derivatives with Donor-acceptor Structure†

doi:10.7503/cjcu20160110

Abstract

Abstract:

Poly{(3-methylthiophene-2,5-diyl)[p-(nitro)benzylidene](3-methylthiophenylene quinodime-thane-2,5-diyl)}(PMTNBQ) with low bandgap was synthesized and its thermoelectric properties were investigated. PMTNBQ/graphite(G) composites were prepared by mixing in solution followed by mechanical ball milling and cold pressing. The thermoelectric properties of the composites were investigated as a function of the graphite to polymer ratios. The highest value of ZT(5.36×10^-3) was obtained for the PMTNBQ/G composite containing 90%(mass fraction) of G. This work suggests that the thermoelectric properties of polymer-inorganic composites can be improved by synthesizing polymers with low band gap.

Key words: Poly{(3-methylthiophene-2, 5-diyl)[p-(nitro)benzylidene](3-methylthiophenylenequinodimethane-2, 5-diyl)}, Graphite, Composite, Thermoelectric material

CLC Number:

TrendMD:

LIANG Ansheng, LI Junjie, PAN Chengjun, WANG Lei. Preparation and Thermoelectric Properties of Composites Based on Polythiophene Derivatives with Donor-acceptor Structure^†[J]. Chem. J. Chinese Universities, 2016, 37(6): 1161.

Figures/Tables 13

Scheme 1 Syntheses of PMTNB and PMTNBQ

Fig.1 1H NMR spectrum of PMTNBQ

Fig.2 FTIR spectra of PMTNB(a) and PMTNBQ(b)

Fig.3 Absorption spectrum of PMTNBQ in CHCl3 at room temperature

Fig.4 SEM images of cross-sections of PMTNBQ(A), PMTNBQ/20%G(B), PMTNBQ/40%G(C) and PMTNBQ/70%G(D)

Fig.5 X-Ray diffraction patterns of PMTNBQ and its corresponding compositesa. Intrinsic PMTNBQ; b. PMTNBQ/20%G; c. PMTNBQ/30%G;d. PMTNBQ/50%G; e. PMTNBQ/70%G.

Fig.6 IR spectra of PMTNBQ and its compositesa. Intrinsic PMTNBQ; b. PMTNBQ/20%G;c. PMTNBQ/30%G; d. PMTNBQ/50%G; e. PMTNBQ/70%G.

Fig.7 TGA curves for PMTNBQ and its compositesa. Intrinsic PMTNBQ; b. PMTNBQ/20%G; c. PMTNBQ/30%G; d. PMTNBQ/40%G; e. PMTNBQ/50%G; f. PMTNBQ/60%G; g. PMTNBQ/70%G.

Fig.8 Electrical conductivities of PMTNBQ/G compositesInset is conductivity vs. temperature.

Fig.9 Seebeck coefficients of PMTNBQ/G composites with different G contents Inset is Seebeck conductivity vs. temperature.

Fig.10 Thermal conductivities as a function of different G contents in PMTNBQ/G composites at room temperature

Fig.11 Power factors of PMTNBQ/G composites at different temperatures

Fig.12 ZT values of PMTNBQ/G composites at different temperaturesTemperature/℃: a. 30; b. 60; c. 90; d. 120.

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