Rod‐Coating: Towards Large‐Area Fabrication of Uniform Reduced Graphene Oxide Films for Flexible Touch Screens

Wang, Jie; Liang, Minghui; Fang, Yan; Qiu, Tengfei; Zhang, Jin; Zhi, Linjie

doi:10.1002/adma.201200055

Cited by 298 publications

(231 citation statements)

References 33 publications

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“…Except for the thickness, the quality is another factor affecting the transparency of graphene. The graphene thermally reduced from graphene oxide (GO) with higher annealing temperature has a higher quality, showing higher transmittance 9. And the GO with lower concentration showed higher transmittance, confirming that the thickness of GO film also has the same effect on its transparency 9.…”

Section: Properties and Preparationmentioning

confidence: 94%

“…The graphene thermally reduced from graphene oxide (GO) with higher annealing temperature has a higher quality, showing higher transmittance 9. And the GO with lower concentration showed higher transmittance, confirming that the thickness of GO film also has the same effect on its transparency 9. Most of all, this prominent transmittance of graphene makes it permeable to light, just like the cornea of the human eye.…”

Section: Properties and Preparationmentioning

confidence: 95%

“…After that, Zhi et al reported a rod‐coating (Meyer rod) method to synthesis uniform rGO films directly on PET substrates 9. The thickness of the wet coating rGO film was determined by the diameter of the wire embraced around a Meyer rod.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

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Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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Humans have numerous senses, wherein vision, hearing, smell, taste, and touch are considered as the five conventionally acknowledged senses. Triggered by light, sound, or other physical stimulations, the sensory organs of human body are excited, leading to the transformation of the afferent energy into neural activity. Also converting other signals into electronical signals, graphene‐based film shows its inherent advantages in responding to the tiny stimulations. In this review, the human‐like senses and reflexes of graphene‐based films are presented. The review starts with the brief discussions about the preparation and optimization of graphene‐based film, as where as its new progress in synthesis method, transfer operation, film‐formation technologies and optimization techniques. Various human‐like senses of graphene‐based film and their recent advancements are then summarized, including light‐sensitive devices, acoustic devices, gas sensors, biomolecules and wearable devices. Similar to the reflex action of humans, graphene‐based film also exhibits reflex when under thermal radiation and light actuation. Finally, the current challenges associated with human‐like applications are discussed to help guide the future research on graphene films. At last, the future opportunities lie in the new applicable human‐like senses and the integration of multiple senses that can raise a revolution in bionic devices.

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Section: Properties and Preparationmentioning

confidence: 94%

Section: Properties and Preparationmentioning

confidence: 95%

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Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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“…This fabrication method is simple, timesaving and easy to scale up when compared with the previously reported fabrication techniques for scalable-reduced GO films. 7,13 In this fabrication process, the GO sheets, after derivatization by carboxylic, phenol hydroxyl and epoxide groups, can readily be exfoliated to form a stable colloidal suspension because they are stabilized by their hydrophilicity and electrostatic repulsion, 14,15 which facilitate the homogeneous arrangement of GO platelets during the preparation of GO films. The subsequent photoreduction can provide appropriate reduction of the GO films and induce effective interlinking of the individual graphene sheets.…”

Section: Introductionmentioning

confidence: 99%

“…Another approach is the 'top-down' method, that is, solution processing of chemically exfoliated graphite, which offer advantages for continuous large-scale production and effective functionalization for particular applications. Recently, many effective solutionprocessing methods have been presented, such as spray-coating, 6 rod-coating, 7 spin-coating, 8 the layer-by-layer technique, 9 the Langmuir-Blodgett technique, 10 interfacial self-assembly 11 and vacuum filtration, 12 all of which indicate the feasibility of wetchemical methods to prepare large-area graphene films, thereby allowing graphene-based devices to be fabricated on virtually any surface. However, the application of these methods is usually limited by the difficulties in preparing large-area, high-quality graphene films, which is specifically due to the inefficiency of the homogeneous arrangement of graphene sheets and the appropriate chemical reduction of graphene oxide (GO) films.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of large-area and high-crystallinity photoreduced graphene oxide films via reconstructed two-dimensional multilayer structures

et al. 2014

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Graphene, the last representative sp 2 carbon material to be isolated, acts as an ideal material platform for constructing flexible electronic devices. Exploring a new method to fabricate high-quality graphene films with high throughput is essential for achieving greater performance with flexible electronic devices. Here, we report a facile coating and subsequent illumination method for mass-fabricating highly crystalline photoreduced graphene oxide (PRGO) films directly onto conductive substrates. The direct fabrication of PRGO films onto Cu foils with partial oxygenated groups, an intensive stacked highly crystalline structure, and reduced graphene oxide regions enable significant performance enhancements when used as supercapacitor electrodes compared with other graphene-only devices, exhibiting high specific capacitances of 275 F g À1 at a scan rate of 10 mV s À1 and 167 F g À1 at 1 V g À1 with excellent rate capability. The as-established all-solid-state flexible supercapacitors exhibit superior flexibility and robust mechanical stability, resulting in a capacitance delay of only 2% after performing 100 bending cycles. The demonstrated PRGO films provide a promising material platform to realize a broad range of applications related to flexible electronics devices. INTRODUCTIONFlexible electronic devices have garnered considerable attention because of the benefits enabled by large-area, lightweight, flexible electrode films, which have the potential to enable unique advances in future mobile applications, such as wearable displays, roll-up solar cells, electronic skin and flexible energy storage. 1,2 Graphene films containing a few layers or multiple layers of two-dimensional graphene sheets are prominent contenders as attractive components for use in flexible electronic devices due to their high conductivity, chemical stability and mechanical flexibility. 3,4 For the practical applications of graphene in these fields, scalable production of macroscopic-scale graphene films is required rather than the current micrometer-sized graphene sheets. To date, the synthesis of large-scale flexible graphene films has mainly been demonstrated by two approaches. One approach is the 'bottom-up' synthesis strategy, by which high-quality graphene can be prepared using chemical vapor deposition to grow graphene at high temperature, followed by a transfer procedure to place graphene films onto flexible substrates; 5 however, this method is not sufficiently cost-and time-effective to be commercially viable for mass production and requires a difficult post-functionalization step to produce the appropriate graphene films. Another approach is the 'top-down' method, that is, solution

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Inorganic Printable Electronic Materials

Chen¹

2016

Printed Electronics

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Rod‐Coating: Towards Large‐Area Fabrication of Uniform Reduced Graphene Oxide Films for Flexible Touch Screens

Cited by 298 publications

References 33 publications

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Fabrication of large-area and high-crystallinity photoreduced graphene oxide films via reconstructed two-dimensional multilayer structures

Inorganic Printable Electronic Materials

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