Ultratough, Ultrastrong, and Highly Conductive Graphene Films with Arbitrary Sizes

Zhang, Miao; Huang, Liang; Ji, Chen; Li, Chun; Shi, Gaoquan

doi:10.1002/adma.201403322

Cited by 188 publications

(195 citation statements)

References 34 publications

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“…Correspondingly, the GFT method facilitates the formation of hierarchically structured GO films with a more interlocked wrinkled texture, alleviating the orderly alignment of GO sheets within nacre-like GO films as reported previously. 23 It is also noted that upon mixing identical amount of PEO and CMC into GO films the XRD patterns of GO/ PEO composite films exhibit more pronounced dependence on the polymer contents in comparison with those of GO/CMC films. We speculated that the intrinsic structure of polymers has a critical effect on the layered structure of GO films and that the relatively hydrophobic PEO chains with more contracted conformation in aqueous solution facilitates the formation of nacre-like GO films with larger interlayer spacing.…”

Section: Structures Of the Go Composite Films Via Gftmentioning

confidence: 94%

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A General Route to Robust Nacre-Like Graphene Oxide Films

Tan

Zhang

et al. 2015

ACS Appl. Mater. Interfaces

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Artificial nacre-like composite films of graphene oxide (GO) with a variety of commercially available water-soluble polymers were fabricated by a gel-film transformation (GFT) technique. The blending of a polymer into the aqueous dispersion of GO can modulate the interaction between GO sheets. Typically, the attraction force between polymer and GO sheets overcomes the dominant hydration and electrostatic repulsive forces between GO sheets, promoting the gelation of GO. Cast drying the resultant GO hydrogel containing small amounts of polymer (1-20 wt % relative to GO depending on the intrinsic structures of polymers) generates layered GO composite films with tensile strengths over 200 MPa and failure strains larger than 3.0%, which are higher than those of natural nacre and most nacre-like GO films. These results indicate that GO/polymer composite hydrogels are excellent precursors for nacre-like GO films and that the GFT approach is a general route toward the large-scale fabrication of nacre-like GO films with unique combinations of high strength and high toughness.

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Section: Structures Of the Go Composite Films Via Gftmentioning

confidence: 94%

“…22,23 These examples indicate that the GO/polymer hydrogels are good precursors for the large-scale fabrication of robust nacre-like GO composite films. However, the GFT method has not yet been studied extensively, and its wide applicability has also not been confirmed.…”

Section: Introductionmentioning

confidence: 96%

A General Route to Robust Nacre-Like Graphene Oxide Films

Tan

Zhang

et al. 2015

ACS Appl. Mater. Interfaces

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“…8b) [213], spin-coating [218], rodcoating or blade-coating [182], casting (Fig. 8c) [76], spray-coating (Fig. 8d) [214], wet-spinning [219], selfassembly (Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

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“…27 Therefore, it is critical to find a facile way to assemble robust GO nanomembranes without adding organic binders.…”

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confidence: 99%

Ultrastrong Freestanding Graphene Oxide Nanomembranes with Surface-Enhanced Raman Scattering Functionality by Solvent-Assisted Single-Component Layer-by-Layer Assembly

Xiong

Zhang

et al. 2016

ACS Nano

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We report single-component ultrathin reduced graphene oxide (rGO) nanomembranes fabricated via nonconventional layer-by-layer assembly (LbL) of graphene oxide flakes, using organic solvent instead of water to provide strong complementary interactions and to ensure the uniform layered growth. This unique approach does not require regular polymeric from the assembly process or intermediate surface chemical modification. The resulting ultrastrong freestanding graphene oxide (rGO) LbL nanomembranes with a very low thickness of 3 nm (three GO monolayers) can be transferred over a large surface area across tens of square centimeters by using a facile surface-tension-assisted release technique. These uniform and ultrasmooth nanomembranes with high transparency (up to 93% at 550 nm) and high electrical conductivity (up to 3000 S/m) also exhibit outstanding mechanical strength of 0.5 GPa and a Young's modulus of 120 GPa, which are several times higher than that of other reported regular rGO films. Furthermore, up to 94 wt % of silver nanoplates can be sandwiched between 5 nm GO layers to construct a flexible freestanding protected noble metal monolayer with surface-enhanced Raman scattering properties. These flexible rGO/Ag/rGO nanomembranes can be transferred and conformally coat complex surfaces and show a cleaner Raman signature, enhanced wet stability, and lower oxidation compared to bare Ag nanostructures.

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Ultratough, Ultrastrong, and Highly Conductive Graphene Films with Arbitrary Sizes

Cited by 188 publications

References 34 publications

A General Route to Robust Nacre-Like Graphene Oxide Films

A General Route to Robust Nacre-Like Graphene Oxide Films

Advanced carbon materials for flexible and wearable sensors

Ultrastrong Freestanding Graphene Oxide Nanomembranes with Surface-Enhanced Raman Scattering Functionality by Solvent-Assisted Single-Component Layer-by-Layer Assembly

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