Evaluation of Solution-Processed Reduced Graphene Oxide Films as Transparent Conductors

Becerril, Héctor A.; Mei, Jie; Liu, Zunfeng; Stoltenberg, Randall M.; Bao, Zhenan; Chen, Yongsheng

doi:10.1021/nn700375n

Cited by 3,010 publications

(2,308 citation statements)

References 32 publications

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“…The reduction of GO by pure hydrazine in the solution phase is particularly interesting because it can produce RGO of relative high quality with relatively small oxygen content 18 . Direct reduction of GO film has also been reported by exposure to hydrazine vapour and/or annealing at high temperature [19][20][21][22] . However, these approaches often involve highly toxic chemicals, require long reduction time, or require hightemperature treatment that are incompatible with flexible plastic substrates, and produce RGO with a relatively high oxygen content (B49%) to give rise to high sheet resistance 23 .…”

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confidence: 92%

A low-temperature method to produce highly reduced graphene oxide

et al. 2013

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Chemical reduction of graphene oxide can be used to produce large quantities of reduced graphene oxide for potential application in electronics, optoelectronics, composite materials and energy-storage devices. Here we report a highly efficient one-pot reduction of graphene oxide using a sodium-ammonia solution as the reducing agent. The solvated electrons in sodium-ammonia solution can effectively facilitate the de-oxygenation of graphene oxide and the restoration of p-conjugation to produce reduced graphene oxide samples with an oxygen content of 5.6 wt%. Electrical characterization of single reduced graphene oxide flakes demonstrates a high hole mobility of 123 cm 2 Vs À 1 . In addition, we show that the pre-formed graphene oxide thin film can be directly reduced to form reduced graphene oxide film with a combined low sheet resistance (B350 O per square with B80% transmittance). Our study demonstrates a new, low-temperature solution processing approach to high-quality graphene materials with lowest sheet resistance and highest carrier mobility.

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confidence: 92%

A low-temperature method to produce highly reduced graphene oxide

et al. 2013

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“…The most common technique has been the oxidisation and subsequent exfoliation of graphite to give graphene oxide. [3][4][5][6][7] However, this technique suffers from one significant disadvantage; the oxidisation process results in the formation of structural defects as evidenced by Raman spectroscopy 3,6 . These defects alter the electronic structure of graphene so much as to render it semiconducting 8 .…”

Section: Introductionmentioning

confidence: 99%

“…These defects alter the electronic structure of graphene so much as to render it semiconducting 8 . These defects are virtually impossible to remove completely; even after annealing at 1000 o C, residual C=O and C-O bonds are observed by X-ray photoelectron spectroscopy 7 . Even mild chemical treatments, involving soaking in oleum, result in non-negligable oxidisation which requires annealing at 800 o C to remove 9 .…”

Section: Introductionmentioning

confidence: 99%

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

et al. 2009

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We have demonstrated a method to disperse and exfoliate graphite to give graphene suspended in water-surfactant solutions. Optical characterisation of these suspensions allowed the partial optimisation of the dispersion process. Transmission electron microscopy showed the dispersed phase to consist of small graphitic flakes. More than 40% of these flakes had <5 layers with ~3% of flakes consisting of monolayers. These flakes are stabilised against reaggregation by Coulomb repulsion due to the adsorbed surfactant. However, the larger flakes tend to sediment out over ~6 weeks, leaving only small flakes dispersed. It is possible to form thin films by vacuum filtration of these dispersions. Raman and IR spectroscopic analysis of these films suggests the flakes to be largely free of defects and oxides. The deposited films are reasonably conductive and are semi-transparent. Further improvements may result in the development of cheap transparent conductors.

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“…Compared with the transfer of graphene film, the film‐formation of GO demonstrates to be more convenient and scale‐up, as well as no limit to substrates. Numerous approaches have been adopted to prepare GO films, including drop‐casting,52, 53 spin‐coating,54 vacuum filtration,5, 55 or other assembly processes56, 57, 58, 59 and so on.…”

Section: Properties and Preparationmentioning

confidence: 99%

“…Chen and Bao et al spin‐coated GO dispersions on the prepared substrate and controlled its thickness by adjusting the rotating speed 54. With low rotating speed to uniformly spread and high speed to a thin layer, they found that the single‐layered graphene films shown sheet resistances as low as ≈10 2 –10 3 Ω sq –1 and with 80% transmittance for 550 nm light.…”

Section: Properties and Preparationmentioning

confidence: 99%

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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Evaluation of Solution-Processed Reduced Graphene Oxide Films as Transparent Conductors

Cited by 3,010 publications

References 32 publications

A low-temperature method to produce highly reduced graphene oxide

A low-temperature method to produce highly reduced graphene oxide

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

Human‐Like Sensing and Reflexes of Graphene‐Based Films

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