Coherency between thermal and electrical transport of partly reduced graphene paper

Gao, Jianshu; Zobeiri, Hamidreza; Lin, Huan; Xie, Danmei; Yue, Yanan; Wang, Xinwei

doi:10.1016/j.carbon.2021.02.102

Cited by 16 publications

(7 citation statements)

References 54 publications

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“…The inset of Figure 4d demonstrates the notable linear coherency between the electrical conductivity ( σ ) and thermal diffusivity improvement in the GA microfiber. This coherency has been thoroughly investigated and explained for multiple carbon‐based nanomaterials in a previous work [44] . The physics reasoning behind this linear correlation stems from the structural arrangement of GO sheets that run parallel to the principal direction of both electron and phonon transport along the length of the microfiber.…”

Section: Dynamic Thermal and Electrical Evolution Of Ga Fibers During...mentioning

confidence: 93%

“…This coherency has been thoroughly investigated and explained for multiple carbon‐based nanomaterials in a previous work. [44] The physics reasoning behind this linear correlation stems from the structural arrangement of GO sheets that run parallel to the principal direction of both electron and phonon transport along the length of the microfiber. After photoreduction removes functional groups from individual GO sheets, the laser‐facilitated thermal annealing yields a more ordered GO network with enhanced electrical connections between adjacent GO layers (i. e. photoreduction transforms the layered GO from internal disordered structure to ordered structure).…”

Section: Dynamic Thermal and Electrical Evolution Of Ga Fibers During...mentioning

confidence: 99%

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Laser Photoreduction of Graphene Aerogel Microfibers: Dynamic Electrical and Thermal Behaviors

et al. 2022

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This work reports the dynamic behaviors of graphene aerogel (GA) microfibers during and after continuous wave (CW) laser photoreduction. The reduction results in one-order of magnitude increase in the electrical conductivity. The experimental results reveal the exact mechanisms of photoreduction as it occurs: immediate photochemical removal of oxygen functional groups causing a sharp decrease in electrical resistance and subsequent laser heating that facilitates thermal rearrangement of GO sheets towards more graphene-like domains. X-ray and Raman spectroscopy analysis confirm that photoreduction removes virtually all oxygen and nitrogen containing functional groups. Interestingly, a dynamic period immediately following the end of laser exposure shows a slow, gradual increase in electrical resistance, suggesting that a proportion of the electrical conductivity enhancement from photoreduction is not permanent. A two-part experiment monitoring the resistance changes in real-time before and after photoreduction is conducted to investigate this critical period. The thermal diffusivity evolution of the microfiber is tracked and shows an improvement of 277 % after all photoreduction experiments. A strong linear coherency between thermal diffusivity and electrical conductivity is also uncovered. This is the first known work to explore both the dynamic electrical and thermal evolution of a GO-based aerogel during and after photoreduction.

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Section: Dynamic Thermal and Electrical Evolution Of Ga Fibers During...mentioning

confidence: 93%

Section: Dynamic Thermal and Electrical Evolution Of Ga Fibers During...mentioning

confidence: 99%

Laser Photoreduction of Graphene Aerogel Microfibers: Dynamic Electrical and Thermal Behaviors

et al. 2022

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“…Since the discovery of graphene, 1 tremendous research has been conducted on the synthesis, structural characterization and understanding, properties characterization and tailoring, and applications of two-dimensional (2D) materials far beyond graphene. [2][3][4][5][6][7][8] Thermal conductivity and interface thermal conductance/resistance of 2D materials are two critical properties in their applications such as integrated circuits, energy conversion, photon sensing, and chemical sensing. Because of their extremely small thickness (rnm), measurement of these two properties faces big challenges, which makes traditional techniques not feasible or suffer very large uncertaintes.…”

Section: Introductionmentioning

confidence: 99%

Critical problems faced in Raman-based energy transport characterization of nanomaterials

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Hunter

Zobeiri

et al. 2022

Phys. Chem. Chem. Phys.

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“…The TET technique is an effective and accurate method (the total uncertainty for thermal diffusivity is 6%) for evaluating the thermal diffusivity of one-dimensional solid materials (including metals and dielectric materials), such as single-walled carbon nanotube bundles [ 45 ], graphene materials [ 46 , 47 , 48 , 49 ], silkworm silks, [ 50 ] silver nanowire network, [ 51 ] freestanding micrometer-thick poly films [ 52 ], carbon fibers [ 53 , 54 ], etc. In this review, we will focus primarily on the characterization of thermal transport in extremely confined metallic nanostructures using the TET and differential TET technique.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transport in Extremely Confined Metallic Nanostructures: TET Characterization

et al. 2022

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In recent years, the continuous development of electronic chips and the increasing integration of devices have led to extensive research on the thermal properties of ultrathin metallic materials. In particular, accurate characterization of their thermal transport properties has become a research hotspot. In this paper, we review the characterization methods of metallic nanomaterials, focusing on the principles of the transient electrothermal (TET) technique and the differential TET technique. By using the differential TET technique, the thermal conductivity, electrical conductivity, and Lorenz number of extremely confined metallic nanostructures can be characterized with high measurement accuracy. At present, we are limited by the availability of existing coating machines that determine the thickness of the metal films, but this is not due to the measurement technology itself. If a material with a smaller diameter and lower thermal conductivity is used as the substrate, much thinner nanostructures can be characterized.

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Coherency between thermal and electrical transport of partly reduced graphene paper

Cited by 16 publications

References 54 publications

Laser Photoreduction of Graphene Aerogel Microfibers: Dynamic Electrical and Thermal Behaviors

Laser Photoreduction of Graphene Aerogel Microfibers: Dynamic Electrical and Thermal Behaviors

Critical problems faced in Raman-based energy transport characterization of nanomaterials

Thermal Transport in Extremely Confined Metallic Nanostructures: TET Characterization

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