Micropatterning of Graphene Sheets by Inkjet Printing and Its Wideband Dipole‐Antenna Application

Shin, Keun-Young; Hong, Jin‐Yong; Jang, Jyongsik

doi:10.1002/adma.201100345

Cited by 235 publications

(179 citation statements)

References 46 publications

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“…Inkjet printing has been widely employed as an efficient technique for the patterning of graphene sheets for the fabrication a variety of flexible electronic devices such as a wideband dipole-antenna, 98 gas sensor 99 and acoustic actuator electrodes. 100 The inks used in these applications comprise aqueous GO either thermally or chemically reduced following printing and can be directly patterned on various flexible substrates such as poly(ethylene terephthalate) film and paper in high resolution.…”

Section: Inkjet Printingmentioning

confidence: 99%

“…102,103 To inkjet print a CCG dispersion, it is usually mixed with surfactant to modify the surface tension and solubility, 99 in contrast to GO-based inks that have no solubility issues and can be mixed with organic solvents to adjust their surface tension. 4,98 For example, a PVA-CCG composite has been used for inkjet printing of organic field-effect transistors. Using the PVA as a stabilizer made it possible to formulate a stable and printable CCG-based ink at low concentrations.…”

Section: Inkjet Printingmentioning

confidence: 99%

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Chemically converted graphene: scalable chemistries to enable processing and fabrication

et al. 2015

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Graphene, a nanocarbon with exceptional physical and electronic properties, has the potential to be utilized in a myriad of applications and devices. However, this will only be achieved if scalable, processable forms of graphene are developed along with ways to fabricate these forms into material structures and devices. In this review, we provide a comprehensive overview of the chemistries suitable for the development of aqueous and organic solvent graphene dispersions and their use for the preparation of a variety of polymer composites, materials useful for the fabrication of graphene-containing structures and devices. Fabrication of the processable graphene dispersions or composites by printing (inkjet and extrusion) or spinning methods (wet) is reviewed. The preparation and fabrication of liquid crystalline graphene oxide dispersions whose unique rheologies allow the creation of graphene-containing structures by a wide range of industrially scalable fabrication techniques such as spinning (wet and dry), printing (ink-jet and extrusion) and coating (spray and electrospray) is also reviewed.

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Section: Inkjet Printingmentioning

confidence: 99%

Section: Inkjet Printingmentioning

confidence: 99%

Chemically converted graphene: scalable chemistries to enable processing and fabrication

et al. 2015

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“…[11][12][13] Even though the field of printable conductors is still mainly focused on metalbased (Ag, Cu, %50 mΩ & À1 at 25 mm thickness) [13,14] inks and PEDOT:PSS dispersions (%50 Ω & À1 ), [15] graphene-based conductive inks are gaining attention both from science [16][17][18][19][20][21][22][23][24] and technology. [25] Unfortunately, the conductive properties of graphene inks and printed structures thereof are still far from being a replacement for silver and copper inks.…”

Section: Introductionmentioning

confidence: 99%

Conductivity Enhancement of Binder‐Based Graphene Inks by Photonic Annealing and Subsequent Compression Rolling

et al. 2016

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This paper describes a combination of photonic annealing and compression rolling to improve the conductive properties of printed binder‐based graphene inks. High‐density light pulses result in temperatures up to 500 °C that along with a decrease of resistivity lead to layer expansion. The structural integrity of the printed layers is restored using compression rolling resulting in smooth, dense, and highly conductive graphene films. The layers exhibit a sheet resistance of less than 1.4 Ω □−1 normalized to 25 µm thickness. The proposed approach can potentially be used in a roll‐to‐roll manner with common substrates, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and paper, paving thereby the road toward high‐volume graphene‐printed electronics.

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“…For example, ink annealing at 250 °C and higher for 30 min [ 18,24,25 ] signifi cantly limits the range of suitable substrates and fundamentally limits high speed R2R industrial realization. Thus, the design of graphene inks that meet the requirements of current R2R applications is still to be accomplished.There are several reports on the preparation of graphene-based inks comprising either graphene oxide (GO), [ 17,19,23,[27][28][29][30] or graphite exfoliated with [ 13,16,18,22,24,25 ] and without [ 20 ] surface active agents. The preparation of inks based on GO is relatively simple.…”

mentioning

confidence: 99%

“…There are several reports on the preparation of graphene-based inks comprising either graphene oxide (GO), [ 17,19,23,[27][28][29][30] or graphite exfoliated with [ 13,16,18,22,24,25 ] and without [ 20 ] surface active agents. The preparation of inks based on GO is relatively simple.…”

mentioning

confidence: 99%

Conductive Screen Printing Inks by Gelation of Graphene Dispersions

Arapov

Rubingh

Abbel

et al. 2015

Adv Funct Materials

150

119

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vital [ 25 ] as it facilitates thick layers (of up to 100 µm) in a single pass, however, at the expense of a lower printing defi nition.Following screen printing typically posttreatments such as drying, annealing, or top-coating are employed to maximize conductivities. The conditions of post-treatment defi ne the substrate that can be used for printing. For example, ink annealing at 250 °C and higher for 30 min [ 18,24,25 ] signifi cantly limits the range of suitable substrates and fundamentally limits high speed R2R industrial realization. Thus, the design of graphene inks that meet the requirements of current R2R applications is still to be accomplished.There are several reports on the preparation of graphene-based inks comprising either graphene oxide (GO), [ 17,19,23,[27][28][29][30] or graphite exfoliated with [ 13,16,18,22,24,25 ] and without [ 20 ] surface active agents. The preparation of inks based on GO is relatively simple. However, due to the low conductivity of GO these inks require harsh post-treatments that make them less relevant to industrial applications. Liquid-phase exfoliation of graphite with or without surfactant by ultrasonication, [ 20,[31][32][33][34] or high-shear mixing [ 22,35 ] is a fl exible, and in the latter case a scalable manufacturing approach. [ 35 ] Nevertheless prolonged high shearing still requires separation of nonexfoliated graphite while the resulting dispersions consist mainly of small (<500 nm) graphene sheets. [ 33,34,36 ] Hence the quality [ 20 ] is far from the one obtained by micromechanical cleavage. [ 37 ] In contrast, expanded graphite (EG) demonstrates much better dispersibility than graphite due to signifi cantly weakened van der Waals interactions on account of an increased distance between the layers. [ 13,[38][39][40] This results in much shorter times and smaller energy input to obtain well-exfoliated concentrated dispersions of typically large (>1 µm) fl ake graphene. [ 39,41 ] Colloidal stability, however, as for the exfoliation of graphite, requires the presence of surface active agents and can be adjusted accordingly. The quality of graphene in EG depends on the precursor used for expansion. For instance, EG obtained from GO exhibits a highly defective structure, [ 41,42 ] whereas EG obtained from either donor-or acceptor-type intercalation compounds (IC) exhibits a much smaller amount of defects and, thus, is more suitable for highly conductive inks. [39][40][41] One of the approaches for ink preparation comprises stabilization of graphene dispersions by surfactants or surface active polymers on account of charge or van der Waals repulsion. This stabilization has been studied and reported by many research

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Micropatterning of Graphene Sheets by Inkjet Printing and Its Wideband Dipole‐Antenna Application

Cited by 235 publications

References 46 publications

Chemically converted graphene: scalable chemistries to enable processing and fabrication

Chemically converted graphene: scalable chemistries to enable processing and fabrication

Conductivity Enhancement of Binder‐Based Graphene Inks by Photonic Annealing and Subsequent Compression Rolling

Conductive Screen Printing Inks by Gelation of Graphene Dispersions

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