Bulk scale growth of CVD graphene on Ni nanowire foams for a highly dense and elastic 3D conducting electrode

Min, Byung Hyun; Kim, Dae Woo; Kim, Kyoung Hwan; Choi, Hyung Ouk; Jang, Sung Woo; Jung, Hee Tae

doi:10.1016/j.carbon.2014.08.084

Cited by 95 publications

(58 citation statements)

References 30 publications

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“…The variation of the relative resistance under the cyclic loading is shown in Figure c, where three tensile strain magnitudes, that is, 11, 32, and 54%, are used. It is found the variation of resistance gradually becomes stable when the cyclic loading is more than five times, which is similar to the experimental observation . Especially, the relative resistance for the sixth circle (tensile strain magnitude equals 54%) with respect to the strain is plotted in Figure d, and a slight hysteretic loop is present which also appears in experiments…”

Section: Resultssupporting

confidence: 86%

“…In fact, a lot of experiments have studied the conductivity behavior of GrFs, and the existence of an optimum number of layers for the conductivity of 3D GrFs is recently reported, which is shown in Figure e and the peak takes place at five layers. Despite a considerable difference in density for 3D GrFs, the conductivity maximum phenomenon is observed demonstrating the robustness of the competition mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…To tame these properties for applications in macroscale, both large‐scale synthesis and integration of graphene sheets are indispensable. In the past few years, it witnesses the rapid development of synthesis technique in this field, 3D GrFs are now endowed with extreme properties encompassing superelasticity, ultralow density, high specific surface area, and good electrical conductivity . This could be the reason for their diverse potential applications, for example, energy storage and conversion, bioelectronics, strain sensors, supercapacitors electrodes, oil absorbers, and shock damping …”

Section: Introductionmentioning

confidence: 99%

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Conductivity Maximum in 3D Graphene Foams

Liu

Wang

Tang

2018

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In conventional foams, electrical properties often play a secondary role. However, this scenario becomes different for 3D graphene foams (GrFs). In fact, one of the motivations for synthesizing 3D GrFs is to inherit the remarkable electrical properties of individual graphene sheets. Despite immense experimental efforts to study and improve the electrical properties of 3D GrFs, lack of theoretical studies and understanding limits further progress. The causes to this embarrassing situation are identified as the multiple freedoms introduced by graphene sheets and multiscale nature of this problem. In this article, combined with transport modeling and coarse-grained molecular dynamic (MD) simulations, a theoretical framework is established to systematically study the electrical conducting properties of 3D GrFs with or without deformation. In particular, through large-scale and massive calculations, a general relation between contact area and conductance for two van der Waals bonded graphene sheets is demonstrated, in terms of which the conductivity maximum phenomenon in GrFs is first theoretically proposed and its competition mechanism is explained. Moreover, the theoretical prediction is consistent with previous experimental observations.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Conductivity Maximum in 3D Graphene Foams

Liu

Wang

Tang

2018

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“…Later experimentalists mainly used two methods in order to collect 3D graphene structure. [8][9][10][11][12][13] These two methods produce GF with entirely different electrical, thermal, morphological, and mechanical properties with different levels of scalability. [4][5][6][7] The second method is mainly a template-only based technique combined with a chemical vapor deposition (CVD) process where graphene is first deposited on metal/ceramic foam via a CVD process and then the template is etched out completely to form a pure 3D graphene structure.…”

Section: Introductionmentioning

confidence: 99%

A Novel Graphene Foam for Low and High Strains and Pressure Sensing Applications

Samad

Liao

2016

MRS Advances

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We are reporting the formation of free-standing graphene foam (GF) via a novel two-step process, in which a polyurethane (PU) foam is first dip-coated with graphene oxide (GO) and subsequently the dried GO-coated-PU is heated in nitrogen atmosphere at 1000 C. During the pyrolysis of the GO-coated-PU, GO is reduced to GF whereas PU is simultaneously decomposed and released completely as volatiles in a step wise mass-loss mechanism. Morphology of the formed GF conforms to that of the pure PU foam as indicated by the scanning electronic micrographs. Polydimethylsiloxane (PDMS) was successfully infiltrated inside the GF to form flexible and stretch-able conductors. The GF-PDMS composite was tested for it's pressure and strain sensing capabilities. It is shown that a 30% compressive strain changes resistance of the GF-PDMS composite to about 800% of it's original value. Since density of the formed GF is tunable, therefore, the pressure/strain sensivity of the GF-PDMS composite is also tunable.

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“…Thus an effective strategy in performance optimization is the introduction of pores, cracks, and/or channels into the electrode structure, where nucleated gas bubbles are limited in their growth. Compared to the 2D planar architecture, three-dimensional (3D) porous electrode materials, which are designed by incorporating active species into 3D frameworks (such as nickel foams and graphene hydrogels), are expected to possess promising catalytic performance owing to their high catalyst loadings, large electroactive surface area and special channel-rich structure [13][14][15][16][17][18]. However, to the best of our knowledge, the efforts in this direction remain scarce.…”

Section: Introductionmentioning

confidence: 99%