Hierarchical honeycomb graphene aerogels reinforced by carbon nanotubes with multifunctional mechanical and electrical properties

Afroze, Jannatul Dil; Tong, Liyong; Abden, Jaynul; Yuan, Zhangfu; Chen, Yuan

doi:10.1016/j.carbon.2021.01.002

Cited by 44 publications

(21 citation statements)

References 40 publications

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“…If converting the X‐axis of Figure 6d from the compressive pressure to the compressive strain, we can study its potential as a strain sensor, as shown in Figure 6j. Gauge factor (GF) is an indicator of a strain sensor, which was calculated according to the following equation: [ 25 ]

\begin{matrix} G F = (Δ I / I_{0}) / Δ L = ((I - I_{0}) normal/ I_{0}) / (L - L_{0}) \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the mechanical properties of GAs can be effectively enhanced by introducing other reinforcing materials, such as fibrous materials including carbon nanotubes (CNT), [25] polyacrylonitrile (PAN) fibers, [26] and cellulose. [27] For example, Cao et al [26] prepared highly elastic GAs from a composite of PAN fibers and graphene oxide (GO), which has excellent pressure-sensitive properties for monitoring human motions.…”

Section: Introductionmentioning

confidence: 99%

“…Innovative attempts to control the architectures with the introduction of orientation, reinforcing, wrinkling, and hierarchical pores can help to overcome these limitations. [ 19–39 ] GAs with ordered microstructures can be prepared via air foaming, [ 19 ] 3D printing, and freeze‐drying. [ 20 ] In the case of freeze‐drying, the ice crystals act as a solid template, and the graphene sheets can aggregate along the ice crystals.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Wide‐Range Linear and Stable Piezoresistive Sensor Based on Methylcellulose‐Reinforced, Lamellar, and Wrinkled Graphene Aerogels

Chu

Gong

et al. 2021

Adv Materials Technologies

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such as graphene-based materials, boron nitride, and transition metal dichalcogenides, which have been predicted to show piezoelectric properties by density functional theory analysis. [3] Aerogels are porous materials with low density, high porosity, and high specific area. [4] Graphene aerogels (GAs), also known as 3D graphene, are macroscopic architectures assembled from graphene nanosheets. [5] GAs have high surface utilization and are suitable for surface functionalization. [6] The preparation methods of GAs are relatively simple, including self-assembly, [7] sacrificial template, [8] and 3D printing methods. [9] GAs have been widely investigated for the photothermal conversion, [10] electromagnetic shielding, [11] gas sensing, [12] surface catalysis, [13] and wearable devices. [14] GAs are assembled from the graphene sheets via van de Waals forces during the synthesis processes, where the physical connection between the graphene sheets provides macroscopic electrical conductivity. [15] In general, deformation occurs when an external pressure is applied to the GAs, which increases the area of contact between the graphene sheets, and increases the electrical conductivity. [16] It is this mechanism that makes GAs be suitable for piezoresistive sensors. The high sensitivity, wide linear range, good stability, low detection limit, and short response time are all critical features required for a piezoresistive sensor. [17] Although GAs meet most of these requirements due to their 3D interconnected architectures, the disordered microstructure of most isotropic GAs leads to a poor stability and a limited linearity, which severely limits their practical applications. [18] Innovative attempts to control the architectures with the introduction of orientation, reinforcing, wrinkling, and hierarchical pores can help to overcome these limitations. GAs with ordered microstructures can be prepared via air foaming, [19] 3D printing, and freeze-drying. [20] In the case of freeze-drying, the ice crystals act as a solid template, and the graphene sheets can aggregate along the ice crystals. [21] Parallel stacked lamellar architectures with a periodic arrangement could be produced via freeze-drying. [22] The unique architecture could result in Graphene-based aerogels (GAs) have been extensively studied for pressure sensing applications due to their high compressibility and conductivity. But the usually-adopted high-temperature treatment generally damages the flexibility and stability. It is still challenging to prepare piezoresistive sensors with a wide linear range, and reliable cyclic performance. Herein, we demonstrate an excellent wide-range piezoresistive sensor based on an aerogel of methylcellulose reinforced reduced graphene oxide (MC/GA). A steaming reduction at 120 °C is proposed to properly control the intermolecular forces and the chemical bonding between MC and GA. The finite element analysis indicates that wrinkled lamellae with hierarchical pores are beneficial to minimize the stress concentrations. As a result ...

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\begin{matrix} G F = (Δ I / I_{0}) / Δ L = ((I - I_{0}) normal/ I_{0}) / (L - L_{0}) \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Wide‐Range Linear and Stable Piezoresistive Sensor Based on Methylcellulose‐Reinforced, Lamellar, and Wrinkled Graphene Aerogels

Chu

Gong

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…In contrast, flexible physical sensors using graphene exhibit strength in sensitivity, although the sensing range is limited. Thus, a CNT-graphene hybrid structure can provide a synergistic electrical network induced by the interconnections between the graphene and CNTs, resulting in superior stretchability and high sensitivity [85][86][87][88][89][90].…”

Section: Soft Sensorsmentioning

confidence: 99%

Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators

Pyo

Eun

Sim

et al. 2022

Micro and Nano Syst Lett

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Soft devices that are mechanically flexible and stretchable are considered as the building blocks for various applications ranging from wearable devices to robotics. Among the many candidate materials for constructing soft devices, carbon nanomaterials such as carbon nanotubes (CNTs) and graphene have been actively investigated owing to their outstanding characteristics, including their intrinsic flexibility, tunable conductivity, and potential for large-area processing. In particular, hybrids of CNTs and graphene can improve the performance of soft devices and provide them with novel capabilities. In this review, the advances in CNT-graphene hybrid-based soft electrodes, transistors, pressure and strain sensors, and actuators are discussed, highlighting the performance improvements of these devices originating from the synergistic effects of the hybrids of CNT and graphene. The integration of multidimensional heterogeneous carbon nanomaterials is expected to be a promising approach for accelerating the development of high-performance soft devices. Finally, current challenges and future opportunities are summarized, from the processing of hybrid materials to the system-level integration of multiple components.

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Superelastic Carbon Aerogels: An Emerging Material for Advanced Thermal Protection in Extreme Environments

Chang

Cheng

Zhang

et al. 2023

Adv Funct Materials

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speed airflow scouring. Accordingly, the thermal protection system (TPS) must be applied on their surface to cope with the integrated heat load accumulated during flight. [2] The lightweight nature of TPS is critical in addressing the criteria for ultralong-range combat military weapons with high sound speeds and load capacities while considering the production cost in check. Kistler of Stanford University first proposed the concept of aerogel in 1931, [3] which was fabricated by exchanging the liquid in a wet gel by gas whilst guaranteeing that the internal structure did not collapse, becoming one of the lightest solid materials known to date. The abundance of internal nanoscale pore size and highly tortuous pore structure determine aerogel's excellent thermally insulation performance, with the thermal conductivity as low as 0.005 W m −1 K −1 . [4] NASA pioneered the use of aerogels as efficient insulating materials on several Mars rovers and spacecraft parts, such as the insulation assembly of Rover Mars batteries, the outer surface of vehicle decelerators, [5] etc., and is also advancing their application in extra-vehicular insulating suits. [6] Oxide ceramic aerogels have currently been the most rapidly developed in high-temperature insulation; however, due to the restrictions of crystallization-induced pulverization, large thermal expansion, and relatively low operating temperatures, for example, SiO 2 (650 °C), [7] ZrO 2 (1100 °C), [8] Al 2 O 3 (1300 °C), [9] and mullite (1400 °C), these aerogels and their composites suffer from severe strength deterioration and catastrophic structural failure during significant temperature gradient changes or long-term high-temperature exposure. [10] Conversely, carbon aerogels (CAs) maintain their mesoporous structure despite heat treatment over 2500 °C under a vacuum or inert atmosphere, showing favorable thermal stability at ultra-high temperatures. [11] In addition, they also have a much higher specific extinction coefficient (190 m 2 kg −1 ) than others (e.g., SiO 2 aerogel with 20 m 2 kg −1 ), which leads to lower radiative thermal conductivities. [12] Therefore, CAs are anticipated to be up-and-coming candidates for the TPS of hypersonic vehicles in conditions of severe heat flow density and ultra-high temperatures.The terms of CAs initially referred to carbonaceous substances that exist as 3D monoliths macroscopically and

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Hierarchical honeycomb graphene aerogels reinforced by carbon nanotubes with multifunctional mechanical and electrical properties

Cited by 44 publications

References 40 publications

A Wide‐Range Linear and Stable Piezoresistive Sensor Based on Methylcellulose‐Reinforced, Lamellar, and Wrinkled Graphene Aerogels

A Wide‐Range Linear and Stable Piezoresistive Sensor Based on Methylcellulose‐Reinforced, Lamellar, and Wrinkled Graphene Aerogels

Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators

Superelastic Carbon Aerogels: An Emerging Material for Advanced Thermal Protection in Extreme Environments

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