Vertically aligned, ultralight and highly compressive all-graphitized graphene aerogels for highly thermally conductive polymer composites

Li, Xinghua; Liu, Pengfei; Li, Xiaofeng; An, Fengping; Peng, Min; Liao, Kai-Ning; Yu, Zhong‐Zhen

doi:10.1016/j.carbon.2018.09.016

Cited by 158 publications

(106 citation statements)

References 54 publications

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“…heating. 32,[63][64] They found an optimum O/C ratio of 34% where the partially reduced GO sheets contain an optimum surface charge so that they remain mobile during formation of ice crystals. These rGO aerogels need a further thermal reduction to become graphene aerogels.…”

Section: Resultsmentioning

confidence: 99%

“…This contrasts to other similar works in the literature that achieve highly aligned microchannels but dealing with the manipulation of the sample during freezing rather, which may not be so controllable. 63 To gain insight into the surface chemistry evolution, we characterised the aerogels prepared after different times of hydrothermal treatment by XPS and XRD (detailed experimental information in supplementary material). All the characterisation techniques indicated that there is a threshold in surface chemistry between 30 min and 45 min of hydrothermal treatment, whereby the hydrogel is formed.…”

Section: Resultsmentioning

confidence: 99%

“…There are only few recent reports of continuous microchannels and they use a mild reductant (ascorbic acid) and heat treatment. [63][64][65][66] Accordingly, it is apparent that a certain degree of GO reduction is beneficial to attain continuous microchannels by freeze casting. Despite all this plethora of literature leading to different microstructures upon freeze casting, to our knowledge there is no a systematic study trying to generalize how the extent of reduction/gelation affects the formation of the microchannels.To the best of our knowledge, while hydrothermal reduction in autoclave has been widely used for the formation of foam-like graphene aerogels, 46,[67][68] the freeze casting starting from graphene hydrogels prepared by hydrothermal reduction in autoclave has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduced Graphene Oxide Aerogels with Controlled Continuous Microchannels for Environmental Remediation

Rodríguez-Mata

González‐Domínguez

Benito

et al. 2019

ACS Appl. Nano Mater.

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3D porous graphene microarchitectures with aligned and continuous channels are of paramount interest for several applications such as pollutant removal, energy storage or biomedical engineering. For these applications, an accurate control in the pore microstructure is of capital importance. Freeze casting is a well-stablished technique to prepare graphene aerogels with unidirectional channels. This technique is typically applied to plain GO colloids, leading to discontinuous microchannels. Herein we have carried out the freeze process starting directly with partially reduced graphene (rGO) hydrogels prepared by a prior hydrothermal treatment in autoclave. This approach leads to the formation of aerogels with aligned and continuous microchannels, enabled by an

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduced Graphene Oxide Aerogels with Controlled Continuous Microchannels for Environmental Remediation

Rodríguez-Mata

González‐Domínguez

Benito

et al. 2019

ACS Appl. Nano Mater.

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“…Obviously, because of the effective decreases in both the contact thermal resistance between graphene sheets and the interface thermal resistance between graphene and polymer matrix, preconstruction of a continuous graphene conduction network becomes an efficient approach for improving thermal conductivities of polymer/graphene composites [25][26][27][28][29][30]. However, the enhancement efficiency in thermal conductivity is still far from the theoretical value.…”

Section: Introductionmentioning

confidence: 99%

3D Lamellar-Structured Graphene Aerogels for Thermal Interface Composites with High Through-Plane Thermal Conductivity and Fracture Toughness

et al. 2020

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Highlights Lamellar-structured graphene aerogels with vertically aligned and closely stacked high-quality graphene lamellae are fabricated. The superior thermally conductive capacity of the aerogel endows epoxy with a high through-plane thermal conductivity of 20.0 W m −1 K −1 at 2.30 vol% of graphene content. The nacre-like structure endows the epoxy composite with enhanced fracture toughness. Abstract Although thermally conductive graphene sheets are efficient in enhancing in-plane thermal conductivities of polymers, the resulting nanocomposites usually exhibit low through-plane thermal conductivities, limiting their application as thermal interface materials. Herein, lamellar-structured polyamic acid salt/graphene oxide (PAAS/GO) hybrid aerogels are constructed by bidirectional freezing of PAAS/GO suspension followed by lyophilization. Subsequently, PAAS monomers are polymerized to polyimide (PI), while GO is converted to thermally reduced graphene oxide (RGO) during thermal annealing at 300 °C. Final graphitization at 2800 °C converts PI to graphitized carbon with the inductive effect of RGO, and simultaneously, RGO is thermally reduced and healed to high-quality graphene. Consequently, lamellar-structured graphene aerogels with superior through-plane thermal conduction capacity are fabricated for the first time, and its superior through-plane thermal conduction capacity results from its vertically aligned and closely stacked high-quality graphene lamellae. After vacuum-assisted impregnation with epoxy, the resultant epoxy composite with 2.30 vol% of graphene exhibits an outstanding through-plane thermal conductivity of as high as 20.0 W m −1 K −1 , 100 times of that of epoxy, with a record-high specific thermal conductivity enhancement of 4310%. Furthermore, the lamellar-structured graphene aerogel endows epoxy with a high fracture toughness, ~ 1.71 times of that of epoxy. Electronic supplementary material The online version of this article (10.1007/s40820-020-00548-5) contains supplementary material, which is available to authorized users.

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“…For example, the pore sizes of the aerogel can be easily controlled by changing the freezing rate, and the vertically aligned pore structure can also be easily obtained by unidirectional freezing the monolithic gel. Therefore, freeze drying is a versatile technique for the preparation of aerogels with controllable structures and has been widely used …”

Section: Preparation and Classification Of Aerogelsmentioning

confidence: 99%

Versatile Aerogels for Sensors

Yang

Zheng

et al. 2019

Small

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Aerogels are unique solid‐state materials composed of interconnected 3D solid networks and a large number of air‐filled pores. They extend the structural characteristics as well as physicochemical properties of nanoscale building blocks to macroscale, and integrate typical characteristics of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. These features endow aerogels with high sensitivity, high selectivity, and fast response and recovery for sensing materials in sensors such as gas sensors, biosensors and strain and pressure sensors, among others. Considerable research efforts in recent years have been devoted to the development of aerogel‐based sensors and encouraging accomplishments have been achieved. Herein, groundbreaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Moreover, the current challenges and some perspectives for the development of high‐performance aerogel‐based sensors are summarized.

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Vertically aligned, ultralight and highly compressive all-graphitized graphene aerogels for highly thermally conductive polymer composites

Cited by 158 publications

References 54 publications

Reduced Graphene Oxide Aerogels with Controlled Continuous Microchannels for Environmental Remediation

Reduced Graphene Oxide Aerogels with Controlled Continuous Microchannels for Environmental Remediation

3D Lamellar-Structured Graphene Aerogels for Thermal Interface Composites with High Through-Plane Thermal Conductivity and Fracture Toughness

Versatile Aerogels for Sensors

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