Engineering doping level for enhanced thermoelectric performance of carbon nanotubes/polyaniline composites
TL;DR: In this paper, a series of carbon nanotubes/polyaniline composites with varied CNTs loadings are doped with various amount of camphorsulfonic acid to control doping level of PANI.
About: This article is published in Composites Science and Technology.The article was published on 2021-07-07. It has received 21 citations till now. The article focuses on the topics: Polyaniline & Doping.
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TL;DR: In this paper , a flexible thermoelectric generator with five pairs of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/single-walled carbon nanotube (SWCNT) composite fibers were fabricated by a continuous wet spinning process using concentrated sulfuric acid as a coagulation bath, which could effectively remove the excess PSS and result in improved electric conductivity.
17 citations
TL;DR: In this paper , the authors adopt dimethyl sulfoxide (DMSO) doping and NaBH 4 dedoping to achieve high thermoelectric properties of PEDOT:PSS/SWCNTs composite film by simultaneously improving σ and Seebeck coefficient.
16 citations
01 Apr 2022
TL;DR: In this paper , a mechanically enhanced carbon fiber-reinforced polymers (CFRP) with highly efficient EMI shielding was fabricated through in-situ polymerization of polyaniline (PANI) nanolayer.
Abstract: The development of carbon fiber-reinforced polymers (CFRPs) with high electromagnetic interference (EMI) shielding effectiveness is highly desirable for engineering applications. Nevertheless, poor interfacial adhesion between carbon fibers (CFs) and polymer matrix remains a serious issue. Herein, a mechanically enhanced CF/epoxy composite with highly efficient EMI shielding was fabricated through in-situ polymerization of polyaniline (PANI) nanolayer. The PANI nanolayer improved the interfacial adhesion in the composites via the entanglement of molecular chains, π–π stacking, and chemical bonding et al. The resulting CF/PANI/epoxy composite exhibited an interlaminar shear strength of 72.8 MPa, which was a 24% improvement over 58.5 MPa for the virgin CF/epoxy composite. Moreover, an excellent EMI shielding effectiveness of 54.8 dB was achieved, which was 58% higher than that of the virgin CF/epoxy composite. This could be attributed to the significant enhancement in conduction loss, interfacial polarization loss, and multiple reflections with the help of PANI nanolayer. This study provides a novel strategy for the development of high-performance CFRPs for efficient EMI shielding.
15 citations
TL;DR: In this paper, a new hydrophilic substrate of poly (vinyl alcohol co-ethylene) (PVA-co-PE) nanofiber membrane was used to support the poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PSS), and then the PEDOT:PSS/PVA co-PE composite was encapsulated by epoxy.
13 citations
TL;DR: In this paper , a new hydrophilic substrate of poly (vinyl alcohol co-ethylene) (PVA-co-PE) nanofiber membrane was used to support the poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PSS), and then the PEDOT:PSS/PVA co-PE composite was encapsulated by epoxy.
Abstract: With the rapid development of thermoelectric (TE) generators, the TE device that is transparent, flexible, and can be used for a long time under high humidity and low/high temperature has aroused great interests. In this study, a new hydrophilic substrate of poly (vinyl alcohol-co-ethylene) (PVA-co-PE) nanofiber membrane was used to support the poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and then the PEDOT:PSS/PVA-co-PE composite was encapsulated by epoxy. Due to the size effect of nanofibers, the PVA-co-PE/epoxy composite area shows a good transmittance of 72% at a wavelength of 600 nm, while the area containing the PEDOT:PSS remains black. This kind of transparent packaging structure is more conducive to the application of TE device. Moreover, the special interpenetrating structure and hydrogen bonding between the three phases of PEDOT:PSS, PVA-co-PE NM and epoxy resin greatly enhance the interfacial adhesion of PEDOT:PSS/PVA-co-PE/epoxy composite. The morphology, mechanical properties, transmittance, TE performance, bending resistance and environmental stability of the transparent composite TE device were analyzed. The new composite structure proposed in this research gives the PEDOT:PSS/PVA-co-PE/epoxy TE device outstanding flexibility and environmental stability. The TE performance remains stable after 2000 cycles repeated bending and after placing one end of the TE device in hot steam and ice water. All the results demonstrate the potential application of the transparent composite TE device in the field of flexible electronic device packaging and applications.
13 citations
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TL;DR: This review aims to comprehensively summarize the state-of-the-art strategies for the realization of high-performance thermoelectric materials and devices by establishing the links between synthesis, structural characteristics, properties, underlying chemistry and physics.
Abstract: The long-standing popularity of thermoelectric materials has contributed to the creation of various thermoelectric devices and stimulated the development of strategies to improve their thermoelectric performance. In this review, we aim to comprehensively summarize the state-of-the-art strategies for the realization of high-performance thermoelectric materials and devices by establishing the links between synthesis, structural characteristics, properties, underlying chemistry and physics, including structural design (point defects, dislocations, interfaces, inclusions, and pores), multidimensional design (quantum dots/wires, nanoparticles, nanowires, nano- or microbelts, few-layered nanosheets, nano- or microplates, thin films, single crystals, and polycrystalline bulks), and advanced device design (thermoelectric modules, miniature generators and coolers, and flexible thermoelectric generators). The outline of each strategy starts with a concise presentation of their fundamentals and carefully selected examples. In the end, we point out the controversies, challenges, and outlooks toward the future development of thermoelectric materials and devices. Overall, this review will serve to help materials scientists, chemists, and physicists, particularly students and young researchers, in selecting suitable strategies for the improvement of thermoelectrics and potentially other relevant energy conversion technologies.
951 citations
645 citations
TL;DR: In this paper, the effects of secondary doping on polyaniline and its derivatives are shown to be based on a change in the molecualar conformation of the polyamide from "compact coil" to "expanded coil" during the secondary doping process.
593 citations
TL;DR: This study suggests that constructing highly ordered chain structure is a novel and effective way for improving the thermoelectric properties of conducting polymers.
Abstract: Hybrid nanocomposites containing carbon nanotubes (CNTs) and ordered polyaniline (PANI) have been prepared through an in situ polymerization reaction using a single-walled nanotube (SWNT) as template and aniline as reactant. TEM, SEM, XRD, and Raman analyses show that the polyaniline grew along the surface of CNTs forming an ordered chain structure during the SWNT-directed polymerization process. The SWNT/PANI nanocomposites show both higher electrical conductivity and Seebeck coefficient as compared to pure PANI, which could be attributed to the enhanced carrier mobility in the ordered chain structures of the PANI. The maximum electrical conductivity and Seebeck coefficient of composites reach 1.25 × 104 S m−1 and 40 μV K−1, respectively, and the maximum power factor is up to 2 × 10−5 W m−1 K−2, more than 2 orders of magnitude higher than the pure polyaniline. This study suggests that constructing highly ordered chain structure is a novel and effective way for improving the thermoelectric properties of c...
589 citations
TL;DR: In this paper, a polyaniline/multi-wall carbon nanotube (PANI/MWNT) composite has been successfully synthesized by an in-situ polymerization process.
464 citations