Polypyrrole/Polyaniline Nanocomposite Nanotubes with Enhanced Thermoelectric Properties †

doi:10.7503/cjcu20190425

Abstract

Abstract:

Polypyrrole(PPy)/polyaniline(PANi) composite nanotubes were synthesized by in situ polymerization using PPy nanotubes as the templates. Structure analysis shows the combination of PANi and PPy with similar molecular chain structure can effectively enhance the electrical conductivity due to the π-π conjugated interaction and hydrogen-bonding in PPy/PANi composite nanotubes. Besides, the chain of PANi in PPy/PANi develops towards a larger crystalline orientation along with the increasing PANi content, forming a more regular and compact chain stacking, which is beneficial to improving the thermoelectric properties of the materials. Consequently, the power factor of the PPy/PANi composite nanotubes achieve 0.74 μW/(m·K ²) at 363 K when the molar ratio of PPy to PANi is 1∶2.

Key words: Polypyrrole nanotube, Polyaniline, Nanocomposites, Thermoelectric property

CLC Number:

O631

TrendMD:

WANG Yihan,YIN Qiang,DU Kai,YIN Qinjian. Polypyrrole/Polyaniline Nanocomposite Nanotubes with Enhanced Thermoelectric Properties ^†[J]. Chem. J. Chinese Universities, 2020, 41(1): 175.

Figures/Tables 10

Fig.1 SEM images of PPy particles(A), PPy-0.5∶1(B), PPy-1∶1(C), PPy-1.5∶1(D), PPy-2∶1(E) and PPy-2.5∶1(F)

Fig.2 TEM images of PPy particles(A), PPy-0.5∶1(B), PPy-1∶1(C), PPy-1.5∶1(D), PPy-2∶1(E) and PPy-2.5∶1(F)

Fig.3 Electrical conductivities, Seebeck coefficients(A) and power factors(B) of PPy nanotubes synthesized by different concentrations of FeCl3 PPy nanotubes with different diameter: a. PPy-0.5∶1; b. PPy-1∶1; c. PPy-1.5∶1; d. PPy-2∶1; e. PPy-2.5∶1.

Fig.4 FTIR spectra of MO-PPy(a), PPy/PANi-3∶1(b), PPy/PANi-2∶1(c), PPy/PANi-1∶1(d), PPy/PANi-1∶2(e) nanotube composites and PANi(f)

Fig.5 Raman spectra of MO-PPy(a), PPy/PANi-3∶1(b), PPy/PANi-2∶1(c), PPy/PANi-1∶1(d) and PPy/PANi-1∶2(e) nanotube composites

Fig.6 XRD pattern of MO-PPy(a), PPy/PANi-3∶1(b), PPy/PANi-2∶1(c), PPy/PANi-1∶1(d), PPy/PANi-1∶2(e) nanotube composites and PANi(f)

Fig.7 SEM images of PPy/PANi-3∶ 1(A), PPy/PANi-2∶1(B), PPy/PANi-1∶1(C) and PPy/PANi-1∶2(D) Inset: magnified image of PPy/PANi-1∶2 nanotube composite.

Fig.8 Electrical conductivities(A), Seebeck coefficients(B) and power factors(C) of MO-PPy(a), PPy/PANi-3∶1(b), PPy/PANi-2∶1(c), PPy/PANi-1∶1(d) and PPy/PANi-1∶2(e) nanotube composites at different temperatures

Scheme 1 Schematic illustration of PPy/PANi nanotube composites

Sample	σ/(S·m^-1)	S/(μV·K^-1)	PF/(μW·m^-1·K^-2)
PANi	298	10.40	0.032
PPy	719	7.30	0.038
MO-PPy	3300	12.58	0.52
PPy/PANi-3∶1	3378	14.48	0.70
PPy/PANi-2∶1	3441	13.35	0.61
PPy/PANi-1∶1	3380	12.78	0.54
PPy/PANi-1∶2	3353	14.86	0.74

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