Optimization of thermoelectric properties of carbon nanotube veils by defect engineering

Zeng, Chongyang; Steiner, Pietro; Chen, Kan; Wan, Kening; Ming, Dong; Li, Suwei; Kocabaş, Coşkun; Reece, Michael J.; Volkov, Alexey N.; Zhang, Han; Bilotti, Emiliano

doi:10.1039/d3mh00525a

Cited by 3 publications

(4 citation statements)

References 66 publications

(99 reference statements)

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“…Additionally, the energy levels in organic materials are more dispersed, leading to lower Seebeck coefficients. Currently, prominent organic thermoelectric materials encompass graphene, − carbon nanotube (CNT), , and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). − Similar to piezoelectric materials, the contemporary fabrication of thermoelectric materials is frequently carried out using a composite approach involving both inorganic and organic constituents. The resulting composite thermoelectric materials typically manifest exceptional flexibility and surpass pure organic counterparts in terms of conductivity and conversion efficiency.…”

Section: Thermoelectric Self-powered Sensormentioning

confidence: 99%

Recent Advances in Self-powered Sensors Based on Nanogenerators: From Material and Structural Design to Cutting-Edge Sensing Applications

Ren,

Guo,

Wang

et al. 2024

ACS Appl. Electron. Mater.

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The utilization of sensors has become indispensable in the advent of an intelligent era characterized by artificial intelligence, 5G communication, big data, and other cutting-edge technologies. Traditional sensors require external power sources or batteries, resulting in a complex sensing system that does not promote the development of sustainable and environmentally friendly applications for health monitoring. In recent years, the electrical output and stability of piezoelectric, triboelectric, thermoelectric, and hybrid nanogenerators have been significantly improved, enabling their widespread role in the development of self-powered sensors. The sensors are capable of performing sensing tasks by converting their own energy, thereby obviating the need for an external power supply. In this paper, we initially explore the operating mechanisms, device materials, and structures of diverse nanogenerators and evaluate their output efficacy. Subsequently, we showcase the latest advancements in self-powered sensor systems, spanning various fields such as biomedical and healthcare, wearable devices, sound monitoring, smart vehicles, environmental monitoring, and smart cities. The paper also explores the future potential of self-powered sensor systems, in addition to discussing their practical applications.

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Section: Thermoelectric Self-powered Sensormentioning

confidence: 99%

Recent Advances in Self-powered Sensors Based on Nanogenerators: From Material and Structural Design to Cutting-Edge Sensing Applications

Ren,

Guo,

Wang

et al. 2024

ACS Appl. Electron. Mater.

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“…37,38 Jiang et al reported the value of Seebeck coefficient, electrical conductivity, and TE figure of merit 196 μV K −1 , 11.9 MS m −1 , and 0.15, respectively for p-type (10,0) SWCNT and further enhanced the TE parameters at elevated temperature with a zT value of 0.77 at 1000 K. 39 Zeng et al reported a 3.5-fold reduction in the thermal conductivity of CNT networks by defect engineering. 11 The tunability of the Seebeck coefficient and electronic band gap was reported for (7,0) and (8,0) SWCNTs through uniaxial stress. 40 Hence, strain is one of the methods to alter both the electronic and thermoelectric properties of CNTs and is expected to enhance the TE performance of nanomaterials.…”

Section: Introductionmentioning

confidence: 96%

“…TEG has been an enormous application in self-powered biosensors and IoT-based devices. [10][11][12] The human body is an enormous energy source generated by body heat and the moving of organs. 13 A person's daily activities, such as breathing, body heating, leg movements, finger and limb motions, may generate substantial power to make a wearable electronic device operational.…”

Section: Introductionmentioning

confidence: 99%

Ab initio study of uniaxial strain-induced thermoelectric property tuning of individual single-wall carbon nanotubes

Islam,

Zubair

2023

Mater. Adv.

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“…Carbon nanotubes (CNTs) have attracted extensive attention from researchers due to their various excellent properties, such as high modulus, high strength [ 1 ], high electrical conductivity [ 2 ], and high thermal conductivity [ 3 ], making them ideal reinforcement for nanocomposites [ 4 , 5 ]. The high aspect ratio and high specific surface area of CNTs can maximize the excellent micro-nano properties of CNT fillers on the macro scale.…”

Section: Introductionmentioning

confidence: 99%

Interfacial and Filler Size Effects on Mechanical/Thermal/Electrical Properties of CNTs-Reinforced Nanocomposites

Wang,

Duan,

Gong

et al. 2024

Polymers

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The mechanical/thermal/electrical properties on-demand design of CNTs-reinforced nanocomposites is a key scientific issue that limits the development of new-generation smart nanomaterials, and the establishment of a corresponding unified theoretical prediction model for the mechanical/thermal/electrical properties is the foundation of nanocomposites. Based on the equivalent medium theory (EMT) obtained by Maxwell far-field matching, a unified mechanical/thermal/electrical modified EMT model is established by introducing Young’s modulus, thermal conductivity, and electrical conductivity to the thin filler–matrix’s interlayer. According to literature, the proposed model was employed to theoretically calculate the variations in the overall Young’s modulus, thermal conductivity, and electrical conductivity of CNTs-reinforced nanocomposites with respect to the volume concentration of CNT fillers. Then, the applicability of the proposed theoretical model was validated in comparison with the experimental measurements. Numerical calculations showed that the interface is a key factor affecting the mechanical/thermal/electrical properties of CNTs-reinforced nanocomposites, and strengthening the interfacial effect is an effective way to enhance the overall properties of nanocomposites. In addition, the aspect ratio of CNT fillers also significantly affects the material properties of the CNT fillers interface phase and the CNTs-reinforced nanocomposites. By fitting the experimental data, the calculation expressions of the aspect ratios of CNT fillers on the Young’s modulus, thermal conductivity, and electrical conductivity of the CNT fillers interfacial phase are quantitatively given, respectively.

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Optimization of thermoelectric properties of carbon nanotube veils by defect engineering

Abstract: Defect engineering of CNT veils, by stretching and heat-repairing, is shown to be a method for optimising thermoelectric performances, as thermal conductivity can be reduced without significantly affecting Seebeck voltage and electrical conductivity.

Cited by 3 publications

References 66 publications

Recent Advances in Self-powered Sensors Based on Nanogenerators: From Material and Structural Design to Cutting-Edge Sensing Applications

Recent Advances in Self-powered Sensors Based on Nanogenerators: From Material and Structural Design to Cutting-Edge Sensing Applications

Ab initio study of uniaxial strain-induced thermoelectric property tuning of individual single-wall carbon nanotubes

Interfacial and Filler Size Effects on Mechanical/Thermal/Electrical Properties of CNTs-Reinforced Nanocomposites

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