High cross‐plane thermoelectric performance of carbon nanotube sponge films

Wu, Dongxu; Huang, Congliang

doi:10.1002/er.5043

Cited by 5 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the two-dimensional (2D) CNT film TA transducers encounter significant obstacles: (1) they are easily damaged and unsuitable in a liquid environment due to their low mechanical strength through-thickness [34]; (2) they are unsuitable for high-intensity pulse excitation due to the quick heating up and slow heat dissipation rate of low-surface-area CNT film TA transducers [39]. The three-dimensional (3D) CNT sponge with porous structure attracted much interest due to its excellent selfsupporting performance [40], high heat dissipation [39], and high mechanical stability [41]. Aliev et al [39] measured the acoustic characteristics and bending ability of the CNT sponge, and they found that it had better heat transfer capacity and mechanical properties comparable to MWNT sheets.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Transient Thermoacoustic Characteristics and Performance in Carbon Nanotube Sponge Underwater Transducers

Qi,

Li,

Yin

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Recent advancements in marine technology have highlighted the urgent need for enhanced underwater acoustic applications, from sonar detection to communication and noise cancellation, driving the pursuit of innovative transducer technologies. In this paper, a new underwater thermoacoustic (TA) transducer made from carbon nanotube (CNT) sponge is designed to achieve wide bandwidth, high energy conversion efficiency, simple structure, good transient response, and stable sound response, utilizing the TA effect through electro-thermal modulation. The transducer has potential application in underwater acoustic communication. An electro-thermal-acoustic coupled simulation for the open model, sandwich model, and encapsulated model is presented to analyze the transient behaviors of CNT sponge TA transducers in liquid environments. The effects of key design parameters on the acoustic performances of both systems are revealed. The results demonstrate that a short pulse excitation with a low duty cycle could greatly improve the heat dissipation of the encapsulated transducer, especially when the thermoacoustic response time becomes comparable to thermal relaxation time.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of Transient Thermoacoustic Characteristics and Performance in Carbon Nanotube Sponge Underwater Transducers

Qi,

Li,

Yin

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Ao et al fabricated a Te-based Bi 2 Te 3 film and obtained a maximum power factor of 14.58 μW/cm K 2 at 623 K. Zheng et al . fabricated a Ag 2 Se thin film using the filtration method and obtained a power factor of 21.6 μW/cm K 2 at 348 K. Thus, fabricating a thin film using the vacuum filtration technique is a good choice for making flexible films from inorganic materials. − …”

Section: Introductionmentioning

confidence: 99%

High Performance of n-Type Silver Telluride Nanoparticle-Embedded Nylon Membrane Composite Flexible Films for Thermoelectric Generators

Gautam,

Khare

2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Due to the rapid advancement of flexible electronics, flexible thermoelectric materials that capture waste thermal energy have attracted much interest in recent years. In this study, we presented the preparation of a flexible Ag2Te-nylon composite film using the vacuum filtration method, which exhibited a high Seebeck coefficient (−135.5 μV/K) and simultaneous lower thermal conductivity (0.29 W/m K), resulting in an enhanced power factor of about 450 μW/m K2 and a figure of merit (zT) of about 0.48 at 313 K. The developed composite film demonstrates good flexibility in the bending test by retaining about 87% of the electrical conductivity even after 500 times bending. A single strip of the Ag2Te-nylon film can generate a maximum power density (PDmax) of ∼466 μW/cm2 at a ΔT of ∼36.8 K. The obtained thermoelectric performance of the present flexible film is higher in comparison to that of previously reported Ag2Te-based flexible thermoelectric generators. This shows great potential for the current method of fabrication of a flexible thermoelectric film for converting low-grade heat into useful electrical energy.

show abstract

“…6 Although the encapsulating freestanding CNT sheet with vibrating plates in the inert gas can enhance the robustness of CNT thermophones, the accumulated heat during TA cycling, the acoustic resonance induced by the encapsulating vibrator, and the impedance mismatch lead to degraded device performance. 12 To address these limitations, highly porous freestanding three-dimensional (3D) CNT structures (e.g., yarn structures and CNT foam) have attracted great attention due to their excellent self-supporting performance, 13 improved mechanical stability, 14 and high energy conversion efficiency. 15 However, research on the underwater TA performance of 3D CNTs assemblies remains limited.…”

mentioning

confidence: 99%

Underwater Thermoacoustic Generation by a Hierarchical Tetrapodal Carbon Nanotube Network

Liu,

Saure,

Sriramdas

et al. 2024

ACS Nano

View full text Add to dashboard Cite

Solid-state fabricated carbon nanotube (CNT) sheets have shown promise as thermoacoustic (TA) sound generators, emitting tunable sound waves across a broad frequency spectrum (1−10 5 Hz) due to their ultralow specific heat capacity. However, their applications as underwater TA sound generators are limited by the reduced mechanical strength of CNT sheets in aqueous environments. In this study, we present a mechanically robust underwater TA device constructed from a three-dimensional (3D) tetrapodal assembly of carbon nanotubes (t-CNTs). These structures feature a high porosity (>99.9%) and a double-hollowed network of wellinterconnected CNTs. We systematically explore the impact of different dimensions of t-CNTs and various annealing procedures on sound generation performance. Furnace-annealed t-CNTs, in contrast to directly resistive Joule heating annealing, provide superior, continuous, and homogeneous hydrophobicity across the surface of bulk t-CNTs. As a result, the t-CNTs-based underwater TA device demonstrates stable, smooth, and broad-spectrum sound generation within the frequency range of 1 × 10 2 to 1 × 10 4 Hz, along with a weak resonance response. Furthermore, these devices exhibit enhanced and more stable sound generation performance at nonresonance frequencies compared to regular CNT-based devices. This study contributes to advancing the development of underwater TA devices with characteristics such as being nonresonant, highperforming, flexible, elastically compressible, and reliable, enabling operation across a broad frequency range.

show abstract

High cross‐plane thermoelectric performance of carbon nanotube sponge films

Cited by 5 publications

References 49 publications

Analysis of Transient Thermoacoustic Characteristics and Performance in Carbon Nanotube Sponge Underwater Transducers

Analysis of Transient Thermoacoustic Characteristics and Performance in Carbon Nanotube Sponge Underwater Transducers

High Performance of n-Type Silver Telluride Nanoparticle-Embedded Nylon Membrane Composite Flexible Films for Thermoelectric Generators

Underwater Thermoacoustic Generation by a Hierarchical Tetrapodal Carbon Nanotube Network

Contact Info

Product

Resources

About