Switch on the high thermal conductivity of graphene paper

Xie, Yangsu; Yuan, Pengyu; Wang, Tianyu; Hashemi, Nastaran; Wang, Xinwei

doi:10.1039/c6nr06402g

Cited by 56 publications

(48 citation statements)

References 75 publications

(130 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While in this work, with a large ratio of characteristic lengths in the two directions (mm scale to µm scale), we can safely simplify the thermal transport as 1D in the cross-plane direction and then in the in-plane direction. Our recent work [66] shows that the in-plane thermal diffusivity (αa) of the GP sample is no larger than 5.57 × 10 -4 m 2 s -1 before switch-on. The characteristic thermal relaxation time is defined as tc=L 2 /α.…”

Section: Experimental Setup and Physical Modelmentioning

confidence: 95%

“…shows the SEM image of GP under a 500 × magnification, from which we can see the smooth surface and clear stacking layered structure of the graphene flakes. The x-ray photoelectron spectrometer (XPS) study has also been conducted on the GP in our previous work [66]. The result shows that the elemental composition is C 1s (98.91%), O 1s (0.66%) and F 1s (0.43%),…”

Section: (D)mentioning

confidence: 97%

“…The reduction level and the future restoration of sp 2 domains determine the recovery or healing of the electrical and thermal transport capacities in the products. In GO or rGOP, the interlayer spacing varies from 3.35 Å [66] (same as high-quality graphite) to 9.5 Å [67]. This large range of interlayer spacing is mainly attributed to the different levels of residual functional groups in the basal plane [54].…”

Section: Thermal Transport In Paper-like Graphene-based Materialsmentioning

confidence: 99%

“…It is reported that ultrahigh ka of 1043.5 Wm -1 K -1 is obtained after annealing at 1200 o C and a critical temperature of 1000 o C is required for high improvement of ka. Our recent work [66] reported measurements on ka of GP from RT down to very low temperatures. ka shows an interesting jump from 529 Wm -1 K -1 at 270K to 3013…”

Section: Thermal Transport In Paper-like Graphene-based Materialsmentioning

confidence: 99%

“…The GP sample is purchased from Graphene Supermarket. Note that GP has very high electrical conductivity (4.4× 10 4 Sm -1 [66]), so that it should be insulated from the Ir coating to make sure only the electrical resistance variation induced by the back surface temperature evolution is detected. In this work, we use a PET film as an isolator to separate Ir coating from GP.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

See 4 more Smart Citations

Cross-plane thermal transport in graphene-based structures

Han¹

View full text Add to dashboard Cite

Section: Experimental Setup and Physical Modelmentioning

confidence: 95%

Section: (D)mentioning

confidence: 97%

Section: Thermal Transport In Paper-like Graphene-based Materialsmentioning

confidence: 99%

Section: Thermal Transport In Paper-like Graphene-based Materialsmentioning

confidence: 99%

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Cross-plane thermal transport in graphene-based structures

Han¹

View full text Add to dashboard Cite

Wide‐Range and High‐Stability Flexible Conductive Graphene/Thermoplastic Polyurethane Foam for Piezoresistive Sensor Applications

Lü

Meng

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

Moreover, TPU conductive polymer composed of conductive ingredients and insulating TPU matrix can be used in applications of smart sensors, electromagnetic shielding, and oil-water separation. [11][12][13][14][15][16] Through introducing a 3D porous structure to TPU conductive polymer while utilizing the advantageous abilities of light weight, large specific surface area, and high porosity of the porous structure, [17][18][19][20][21] the TPU conductive polymer foam can achieve excellent flexibility and piezoresistive performance by combining its mechanical and electrical properties, exhibiting great potential in applications of flexible pressure sensors. [22][23][24][25][26][27] In recent years, TPU conductive polymer foam has been extensively studied in field of flexible pressure sensors. This material can further be subdivided into carbon black (CB)/TPU conductive foam, carbon nanotubes (CNT)/TPU conductive foam, and graphene (G)/TPU conductive foam in terms of the conductive filler types. The 0D CB featuring with outstanding advantages in good conductivity, small size, cost-efficient, and easy availability, which can be prepared the conductive TPU foam. [28][29][30][31] Guan et al. prepared a CB/TPU foam which exhibits its performance in measuring range (20 Pa to 1.2 MPa) and sensitivity (1.12 kPa −1 ). [22] The CB/TPU foam fabricated by Zhai et al. displays a response/relaxation time (150/150 ms), workable detection range (584.4 kPa) and durability (more than 10 000 cycles at 15 kPa). [32] The 1D CNT featuring with exceptional mechanical properties, high electrical conductivity, large vertical and horizontal ratio, has been acknowledged as an ideal filler for conductive polymer composite materials. [33][34][35] Liu et al. prepared a compressible (90%) CNT/TPU foam which displays piezoresistive recoverability (50 cycles). [23] In order to improve electromechanical properties of the TPU conductive foam, two methods involving conductive foam pore design and conductive composite matrix control can be adopted. Huang et al. prepared a CNT/TPU conductive foam with aligned porous structure, realizing a linear detection range of 77% (0.92 MPa) and 2000 (6 kPa) cycle stability. [24] Wei et al. prepared a herringbone structured CNT/EP/TPU foam by using epoxy resin (EP) as Flexible pressure sensors based on thermoplastic polyurethane (TPU) conductive polymer foam can be applied to health monitoring, motion detection, and electronic skin. For satisfying the demand of long-term use in highpressure range, the TPU conductive polymer foam requires improvements in detection range, stability, and repeatability. In this paper, a flexible conductive reduced graphene oxide (rGO)/thermoplastic polyurethane (TPU) porous foam with ultra-wide pressure detection range and high-stability is proposed. First, an elastic and flexible TPU polymer foam matrix is fabricated via freezedrying. Then, the rGO/TPU foam is prepared by dip-coating it into graphene oxide (GO) solution followed by chemical reduction. The electromechanical properties ...

show abstract

Large Thermal Conductivity Switch Ratio in Barium Titanate Under Electric Field through First‐Principles Calculation

Liu

Mishra

Chen

et al. 2018

Advcd Theory and Sims

View full text Add to dashboard Cite

The thermal conductivity of crystalline materials is typically one or two orders of magnitude higher than that of their amorphous structures. The phase transition in barium titanate is generally considered to exhibit order–disorder character, suggesting the potential for thermal conductivity switching if this order–disorder transition can be controlled. To investigate this possibility computationally, following the method of Fu and Bellaiche, here electric fields are applied to align the polarizations and transform disordered paraelectric structures to ordered ferroelectric structures. Solving the Boltzmann transport equation, the theoretical limit of a perfectly disordered structure is found to have thermal conductivity of a factor of 3.9 lower than the perfectly ordered structure. The thermal conductivity of the ordered structure can be further enhanced by up to another 2.4 times under electric fields due to the reduction in phonon scattering rates, implying a theoretical maximum thermal conductivity switching ratio of 9.4. This study yields two guidelines in searching for high thermal conductivity switch ratio in ferroelectric materials: the structure should be single domain under electric field and the phase transition should be fully order–disorder rather than displacive.

show abstract

Switch on the high thermal conductivity of graphene paper

Cited by 56 publications

References 75 publications

Cross-plane thermal transport in graphene-based structures

Cross-plane thermal transport in graphene-based structures

Wide‐Range and High‐Stability Flexible Conductive Graphene/Thermoplastic Polyurethane Foam for Piezoresistive Sensor Applications

Large Thermal Conductivity Switch Ratio in Barium Titanate Under Electric Field through First‐Principles Calculation

Contact Info

Product

Resources

About