Synthesis and characterization of poly-Schiff bases with a donor–acceptor structure containing thiophene units as thermoelectric materials

Li, Junjie; Lai, Chunhua; Xiang, Xiongzhi; Wang, Lei

doi:10.1039/c5tc00065c

Cited by 37 publications

(22 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The further addition of Bi 2 Te 3 in G/50 wt.% PTh composites from 5% to 10% slightly decreased the value of the Seebeck coefficient from 23.3 lV/K to 20.4 lV/K, which could be attributed to the lower number of interfaces formed between the fillers and matrix because of the higher density of Bi 2 Te 3 than that of G and PTh. 18 Similar results were also observed for composites C and D with PTh content of about 20 wt.%; they also exhibited much higher Seebeck coefficient values of 15.9 lV/K and 14.2 lV/K than that of G/20 wt.% PTh composite 9.36 lV/K at 30°C. 15 These results also demonstrate that the addition of a small amount of Bi 2 Te 3 into Bi 2 Te 3 /G/PTh composites indeed increased the Seebeck coefficient of these composites.…”

Section: Thermoelectric Properties Of Bi 2 Te 3 /G/pth Compositessupporting

confidence: 87%

“…We attempted to prepare the samples for measurements by using our previous reported method. 18 In order to confirm that the pressure we used to prepare samples has no big influence on the thermoelectric performance, we used small pressure differences (15 MPa and 20 MPa) for preparing samples of 5% Bi 2 Te 3 /40%G/PTh, and found that small pressure differences has limited effects on thermoelectric parameters of our composites (such as power factor and thermal conductivity), as shown in Table SI (Supporting Information). The cuboid specimen with dimensions of 16.0 mm 9 5.10 mm 9 3.0 mm was prepared under a pressure of 15 MPa for the electrical properties measurement, and the disk specimen with a diameter of 15.0 mm and a height of 3.0-4.0 mm was prepared under a pressure of 20 Mpa for the thermal conductivity measurement.…”

Section: Methodsmentioning

confidence: 91%

See 1 more Smart Citation

Preparation and Characterization of Bi2Te3/Graphite/Polythiophene Thermoelectric Composites

Lai

Pan

et al. 2016

Journal of Elec Materi

Self Cite

View full text Add to dashboard Cite

The Bi 2 Te 3 /graphite/polythiophene composites were prepared by solution mixing, mechanical ball milling, cold pressing and spark plasma sintering (SPS) in order to utilize and integrate the high Seebeck coefficient of Bi 2 Te 3 , high electrical conductivity of graphite (G) and low thermal conductivity of polythiophene (PTh). The structures and properties of the composites were characterized by scanning electron microscope, thermo gravimetric analyzer, x-ray diffraction and ULVAC ZEM-2 Seebeck coefficient measurement. The results showed that the related components were uniformly dispersed in the composites, and the electrical conductivity of the composites increased significantly with increasing G content. A small addition of Bi 2 Te 3 to the matrix contributed to an increase in Seebeck coefficient and the thermal conductivity of the composites stayed at a low level owing to the low thermal conductivity of PTh. These composites prepared by SPS show an increase in Seebeck coefficient but a decrease in electrical conductivity as compared to corresponding composites prepared by cold pressing.

show abstract

Section: Thermoelectric Properties Of Bi 2 Te 3 /G/pth Compositessupporting

confidence: 87%

Section: Methodsmentioning

confidence: 91%

Preparation and Characterization of Bi2Te3/Graphite/Polythiophene Thermoelectric Composites

Lai

Pan

et al. 2016

Journal of Elec Materi

Self Cite

View full text Add to dashboard Cite

show abstract

“…The molecular structures of conjugated polymers play a critical role in determining their thermoelectric performance. Conjugated polymers are well known to exhibit strong stacking interactions, and these strong interactions can facilitate charge‐carrier transport and enhance the electrical conductivity of bulk conjugated polymers . On the basis of the equation for ZT , good thermoelectric materials must combine both high electrical conductivities and high Seebeck coefficients.…”

Section: Introductionmentioning

confidence: 99%

Side‐Chain Effects on the Thermoelectric Properties of Fluorene‐Based Copolymers

Liang

Zhou

et al. 2017

Macromol. Rapid Commun.

Self Cite

View full text Add to dashboard Cite

has been used in commerce.[2] However, inorganic mate rials are expensive, toxic, and require a rather complicated manufacturing process.In general, the thermoelectric efficiency of thermoelec tric materials is represented by the dimensionless figure of merit ZT in Equation 1:where S is the Seebeck coefficient, σ and κ are the elec trical and thermal conductivities, respectively, and T is the absolute temperature. Using current technology, precise data for the thermal conductivity of conjugated polymer films is difficult to obtain. We therefore use the thermoelectric power factor (PF; Equation 2) as an alterna tive parameter to examine the performance of conjugated polymers, where S is the Seebeck coefficient and σ is the electrical conductivity. Various studies showing that the charge transport properties and the electrical conduc tivity in conjugated polymers are influenced by the mole cular structural parameters have already been reported. The molecular structures of conjugated polymers play a Three conjugated polymers with alkyl chains of different lengths are designed and syn thesized, and their structure-property relationship as organic thermoelectric materials is systematically elucidated. All three polymers show similar photophysical properties, thermal properties, and mechanical properties; however, their thermoelectric performance is influ enced by the length of their side chains. The length of the alkyl chain significantly influences the electrical conductivity of the conjugated polymers, and polymers with a short alkyl chain exhibit better conduc tivity than those with a long alkyl chain. The length of the alkyl chain has little effect on the Seebeck coefficient. Only a slight increase in the Seebeck coefficient is observed with the increasing length of the alkyl chain. The purpose of this study is to provide comprehensive insight into finetuning the ther moelectric properties of conjugated polymers as a function of sidechain engineering, thereby providing a novel perspec tive into the design of highperformance thermoelectric con jugated polymers.

show abstract

“…The cuboid specimen with dimensions of 16.0 mm × 5.10 mm × 3.0 mm was prepared under a pressure of 15 MPa for the electrical properties measurement, and the disk specimen with a diameter of 15.0 mm and a height of 3.0–4.0 mm was prepared under a pressure of 20 MPa for the thermal conductivity measurement. According to our previous report , two different pressures were applied for the electrical properties and thermal conductivity measurements to obtain more successful samples because of different sample shapes. It was found that the Seebeck coefficient, thermal conductivity, and sample density are only slightly affected under the two tested pressures.…”

Section: Methodsmentioning

confidence: 99%

Effects of side groups on the thermoelectric properties of composites based on conjugated poly(3,4‐ethylenedioxythiophene methine)s with low bandgaps

Lai

Xiang

et al. 2016

Polymer Composites

Self Cite

View full text Add to dashboard Cite

A series of conjugated poly(3,4-ethylenedioxythiophene methine)s (PEDOT-Ms) with different side groups (e.g., electron-withdrawing, electron-donating, and electronneutralizing groups) containing 3,4-ethylenedioxythiophene (EDOT) units was synthesized and characterized, showing low optical bandgaps. Then, the PEDOT-M polymers were blended with graphite (G) to prepare polymer-inorganic composites to compare their thermoelectric (TE) properties. The optical absorption study indicated direct bandgaps ranging from 1.72 to 1.79 eV. The results showed that PEDOT-M polymers with strongly electron-withdrawing and electron-donating groups exhibited lower bandgap values and higher Seebeck coefficients, and their composites exhibited better TE properties than PEDOT-M with an electronneutralizing side group. The highest figure of merit (ZT) value for the (poly[{3,4-ethylenedioxythiophene-2,5-diyl} {p-nitrobenzylidene}{3,4-ethylenedioxythiophenequinodimethane-2,5-diyl}])(PEDOT-NBQ)/80 wt% G composite was 6.75 3 10 23 at 1208C, which was higher than the ZT value of the other PEDOT-M/G composites. These results reveal a novel approach using the structural modifications of polymers to improve the understanding of TE performance and confirm that the conjugated PEDOT-M samples studied are low-bandgap conducting polymers that can be used as TE materials. POLYM. COMPOS.,

show abstract

Synthesis and characterization of poly-Schiff bases with a donor–acceptor structure containing thiophene units as thermoelectric materials

Abstract: A Poly-Schiff base (PSB) with a donor–acceptor structure was successfully synthesized and was blended with different fillers to prepare polymer–inorganic thermoelectric (TE) composites. It is the first time that PSB was treated as a TE material.

Cited by 37 publications

References 50 publications

Preparation and Characterization of Bi2Te3/Graphite/Polythiophene Thermoelectric Composites

Preparation and Characterization of Bi2Te3/Graphite/Polythiophene Thermoelectric Composites

Side‐Chain Effects on the Thermoelectric Properties of Fluorene‐Based Copolymers

Effects of side groups on the thermoelectric properties of composites based on conjugated poly(3,4‐ethylenedioxythiophene methine)s with low bandgaps

Contact Info

Product

Resources

About