聚吡咯/聚苯胺二元复合纳米管及其热电性能

doi:10.7503/cjcu20190425

摘要/Abstract

摘要：

以甲基橙为软模板, 六水合三氯化铁为催化剂, 在水溶液中通过沉淀聚合法制备了管径为20~180 nm的聚吡咯(PPy)纳米管; 以聚吡咯纳米管为基体, 通过原位聚合制备了聚吡咯/聚苯胺(PPy/PANi)二元复合纳米管. 研究发现, 在PPy/PANi二元复合纳米管中, PANi均匀地包覆在PPy纳米管表面, 并形成有序堆积, PPy与PANi间存在强烈的π-π共轭作用与氢键作用, 当PPy与PANi单体摩尔比为1∶2时, PPy/PANi二元复合纳米管的功率因子在363 K时达到0.74 μW/(m·K ²).

关键词: 聚吡咯纳米管, 聚苯胺, 纳米复合材料, 热电性能

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

中图分类号:

O631

TrendMD:

王乙涵,尹强,杜凯,殷勤俭. 聚吡咯/聚苯胺二元复合纳米管及其热电性能. 高等学校化学学报, 2020, 41(1): 175.

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

图/表 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

Table 1 Thermoelectric properties of PANi, PPy, MO-PPy and PPy/PANi nanotube composites at 363 K

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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