Polymers
·
2018
·Vol. 10
·期 8
·815
·
IF 2.935
Sanyin Qu,Chen Ming,Qin Yao,Wanheng Lu,Kaiyang Zeng,Wei Shi,Xun Shi,Ctirad Uher,Lidong Chen
The fundamental understanding of the influence of molecular structure on the carrier transport properties in the field of organic thermoelectrics (OTEs) is a big challenge since the carrier transport behavior in conducting polymers reveals average properties contributed from all carrier transport channels, including those through intra-chain, inter-chain, inter-grain, and hopping between disordered localized sites. Here, combining molecular dynamics simulations and experiments, we investigated the carrier transport properties of doped highly oriented poly(3-hexylthiophene) (P3HT) films with different side-chain regioregularity. It is demonstrated that the substitution of side chains can not only take effect on the carrier transport edge, but also on the dimensionality of the transport paths and as a result, on the carrier mobility. Conductive atomic force microscopy (C-AFM) study as well as temperature-dependent measurements of the electrical conductivity clearly showed ordered local current paths in the regular side chain P3HT films, while random paths prevailed in the irregular sample. Regular side chain substitution can be activated more easily and favors one-dimensional transport along the backbone chain direction, while the irregular sample presents the three-dimensional electron hopping behavior. As a consequence, the regular side chain P3HT samples demonstrated high carrier mobility of 2.9 ± 0.3 cm2/V·s, which is more than one order of magnitude higher than that in irregular side chain P3HT films, resulting in a maximum thermoelectric (TE) power factor of 39.1 ± 2.5 μW/mK2at room temperature. These findings would formulate design rules for organic semiconductors based on these complex systems, and especially assist in the design of high performance OTE polymers.Keywords:organic thermoelectric;poly(3-hexylthiophene);regioregularity;carrier transport
研究领域:
材料科学
·
物理学
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DOI
PubMed
高影响因子
npj Flexible Electronics
·
2020
·Vol. 4
·期 1
·1-7
·
IF 0
Qu Dawei,Huang Xuan,Li Xin,Wang Hanfu,Chen Guangming
Organic and composite thermoelectric (TE) materials have witnessed explosive developments in recent years. Design strategy of their flexible devices is vital to achieve high performance and suit various application environments. Here, we propose a design strategy of annular flexible TE devices with integrated-module architecture, where the independent modules made up of alternatively connected p-n couples are connected in series, and then rounded head-to-tail into annular configuration. The achieved devices can not only save plenty of space owing to their highly integrated structure design, but also be directly mounted on cylindrical objects (like pipes) to suit versatile applications. More importantly, the annular TE devices display excellent performances, superior to most previous work and the traditional serial single-layer film structure. For example, the annular device with eight modules consisting of three p-n couples reveals an output power of 12.37 μW at a temperature gradient of 18 K, much higher than that of the corresponding single-layer film structure (1.74 μW). The integration process is simple and easy to scale up. This architecture design strategy will greatly speed up the TE applications and benefit the research of organic and composite TE materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Huali Xie,Xiuyuan Lin,Jieming Zhang,Xuejun Lai,Kunquan Li,Xiaojing Su,Yunhui Wu,Xiaofan Zhang,Wenjian Wu
Organic thermoelectric materials demonstrate significant application potential for remote temperature monitoring during the fire incubation period and early fire-warning. Nevertheless, their low thermoelectric efficiency compromises the sensitivity, reliability and accuracy of sensing signal. Herein, heterogeneous thermoelectric nanowires (HTN) and thermoelectric graphene (TEG) were synthesized, and they were subsequently co-assembled to construct a thermoelectric nanocoating featuring multiple heterostructure and ordered layered structure. Thanks to the synergistic effect of the two structures, the thermoelectric-response temperature-sensing of the nanocoating demonstrated exceptional sensitivity, accuracy, and stability. The nanocoating swiftly triggered a fire-warning within 1.3 s upon exposure to flame, and even in the event of secondary burning, the fire-warning trigger time was only extended to 1.5 s. The output voltage of the nanocoating exhibited a precise and repeatable linear functional relationship (U = 0.0248 T-0.779) within the temperature range of 50–300 °C, enabling remote real-time temperature monitoring when integrated with a wireless signal transmitter. Moreover, the ordered layered structure endowed the nanocoating with excellent flame-retardancy, enabling it to self-extinguish during the flame-retardant tests. Thus, this thermoelectric nanocoating opened a new pathway for intelligent fire safety protection of flexible electrical materials.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 37
·14187-14193
·
IF 8.262
Guangbao Wu,Caiyan Gao,Guangming Chen,Xin Wang,Hanfu Wang
Organic thermoelectric materials are emerging green energy materials, where n-type candidates are of special interest due to the strong demand for thermoelectric modules with flexibility, light weight, large-area fabrication and ease of processing into versatile shapes. Here, an exciting novel strategy to prepare an n-type single-walled carbon nanotube (SWCNT) is proposed by diethylenetriamine (DETA) doping (electron donation) and subsequent CaH2 treatment of the pristine SWCNT (p-type). The Seebeck coefficient and the electrical conductivity for the obtained DETA-CaH2-SWCNT are −41.0 ± 1.5 μV K−1 and 165 ± 10 S cm−1, respectively. A possible mechanism is discussed for the p- to n-type conversion. Then, a multilayered alternating stacked structure is employed to construct thermoelectric modules which realize the conduction layers electrically in series and thermally in parallel. Importantly, the module containing 14 couples displays large open circuit voltages of 62 mV and 125 mV at temperature gradients (ΔT) of 55 K and 110 K, respectively, and a maximum output power of 649 nW at ΔT = 55 K. The strategy proposed here opens a new way to fabricate organic n-type materials and flexible thermoelectric modules. These promising results show great potential in fabrication and applications of flexible and wearable power-conversion devices for next-generation power generators and waste-heat-recovery systems.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Advanced Energy Materials
·
2021
·Vol. 12
·期 1
·2102835
·
IF 29.368
Yalong Wang,Ziyang Zhou,Jianbang Zhou,Lihua Shao,Yao Wang,Yuan Deng
Compliant thermoelectric generators (TEGs) hold great promise in the field of self-powered wearable electronics. Yet, the low heat transfer efficiency arising from large thermal resistance between elastic encapsulating materials and the contacted objects severely lowers the thermopower. This issue is much more challenging for organic TEG ( o TEG) due to the high parasitic heat loss in the whole polymer system. Herein, guided by finite element analyses, a polydimethylsiloxane based composite coated with Cu is developed as a thermal interface without compromising the compliance of the o TEG, which possesses the merits of high thermal conductivity and significantly reduced thermal resistance, thus maximizing the temperature difference utilization ratio to 86%, which is 75.5% higher than for a routine o TEG. As a proof-of-concept, 50 pairs of p / n porous polyurethane/single-wall carbon nanotube TE legs are integrated onto the designed substrate without further encapsulation. Both simulations and experiments on output performance under various thermal conditions are carried out, and show excellent agreement. The in situ output performance tests under various deformation conditions reveal the mechanical robustness of the o TEG. Finally, an o TEG functioning as a body heat harvester and an environment temperature sensor are demonstrated. The outstanding performances unambiguously demonstrate the success of the thermal interface design strategy for promoting o TEGs applied as wearable electronics.
研究领域:
材料科学
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热电学
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可穿戴技术
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纳米技术
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能量收集
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）