Flexible Field Emission from Thermally Welded Chemically Doped Graphene Thin Films

Jeong, Hee Jin; Jeong, Hae Deuk; Kim, Ho Young; Kim, Sung Hun; Kim, Jun Suk; Jeong, Se Young; Han, Joong Tark; Lee, Geon-Woong

doi:10.1002/smll.201101696

Cited by 31 publications

(19 citation statements)

References 60 publications

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“…These flexible emitters should maintain their original or even better FE properties as well as excellent electrical and mechanical performances after bending, compressing, twisting and stretching. 7,8 To date, a variety of cathodes have been developed based on flexible substrates such as polymers, 9 graphene 7 and carbon fabrics. 10 However, material-and fabrication-related obstacles to the realization of high-performance flexible emitters remain.…”

Section: Introductionmentioning

confidence: 99%

Highly flexible and robust N-doped SiC nanoneedle field emitters

et al. 2015

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Flexible field emission (FE) emitters, whose unique advantages are lightweight and conformable, promise to enable a wide range of technologies, such as roll-up flexible FE displays, e-papers and flexible light-emitting diodes. In this work, we demonstrate for the first time highly flexible SiC field emitters with low turn-on fields and excellent emission stabilities. n-Type SiC nanoneedles with ultra-sharp tips and tailored N-doping levels were synthesized via a catalyst-assisted pyrolysis process on carbon fabrics by controlling the gas mixture and cooling rate. The turn-on field, threshold field and current emission fluctuation of SiC nanoneedle emitters with an N-doping level of 7.58 at.% are 1.11 V μm − 1 , 1.55 V μm − 1 and 8.1%, respectively, suggesting the best overall performance for such flexible field emitters. Furthermore, characterization of the FE properties under repeated bending cycles and different bending states reveal that the SiC field emitters are mechanically and electrically robust with unprecedentedly high flexibility and stabilities. These findings underscore the importance of concurrent morphology and composition controls in nanomaterial synthesis and establish SiC nanoneedles as the most promising candidate for flexible FE applications. NPG Asia Materials (2015) 7, e157; doi:10.1038/am.2014.126; published online 23 January 2015 INTRODUCTIONFlexible electronic devices have attracted extensive attention in recent decades because of their numerous promising applications, such as flexible energy-storage devices, wearable energy-harvesting systems and stretchable electronics. 1-4 Among the emerging technologies, there is considerable interest in flexible field emission (FE) emitters due to their unique lightweight, conformable and flexible nature, which give them the significant advantage of being utilized in roll-up flexible FE displays, 3 e-papers 5 and high-performance X-ray tubes. 6 To enable such next-generation flexible devices, flexible cathodes must be used as the fundamental starting component to replace conventional emitters grown on rigid substrates. These flexible emitters should maintain their original or even better FE properties as well as excellent electrical and mechanical performances after bending, compressing, twisting and stretching. 7,8 To date, a variety of cathodes have been developed based on flexible substrates such as polymers, 9 graphene 7 and carbon fabrics. 10 However, material-and fabrication-related obstacles to the realization of high-performance flexible emitters remain.Silicon carbide (SiC) is an excellent material candidate for constructing advanced FE emitters. SiC is a third-generation wide band-gap semiconductor with excellent physical properties such as high strength and stiffness, high-temperature stability, corrosion resistance and high thermal conductivity. [11][12][13] To date, several studies have explored the FE properties of nanostructured SiC emitters

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Section: Introductionmentioning

confidence: 99%

Highly flexible and robust N-doped SiC nanoneedle field emitters

et al. 2015

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“…Together with high electrical and thermal conductivity, mechanical stability and chemical inertness, it provides a possibility for efficient lowvoltage emission of electrons. The applicability of graphene based FE electron sources has been demonstrated for single and few-layer graphene films in FE displays [2], light sources [3,4], electron guns [5,6], microelectronic FE devices [7,8] etc.…”

Section: Introductionmentioning

confidence: 99%

Edge field emission of large-area single layer graphene

Kleshch

Bandurin

Orekhov

et al. 2015

Applied Surface Science

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“…Chemically modified graphene, which is produced through the oxidation of highly oriented pyrolytic graphite, is composed of typical two-dimensional (2D) particles and is attracting a great deal of interest in colloidal sciences [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The solution processability of graphene oxide (GO) permits application of GO to substrates via spin-coating, spray-casting, drop-casting, or inkjet printing for large-scale production of graphene electronic circuits.…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation and exfoliation processes produce diverse sizes of GO nanoplatelets. The electrical conductivities of chemically-modified graphene nanoplatelets depend on the defect level and the sheet size [12]. Furthermore, small-sized GO nanoplatelets can be used as a p-type dopant and surface modifier of a single-walled carbon nanotube electrode [16].…”

Section: Introductionmentioning

confidence: 99%

“…1d shows the UV absorbance spectra of GO dispersions as a function of the GO concentration, clearly showing a stable dispersion of GO nanoplatelets in solvents. Because of their 2D, open structure, GO nanoplatelets can be cut into small-sized nanoplatelets during exfoliation by sonication [12]. The GO size distribution can therefore be widened by increasing the sonication power and time during the exfoliation of graphite oxide.…”

Section: Introductionmentioning

confidence: 99%

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Size sorting of chemically modified graphene nanoplatelets

Han¹,

Jang²,

Kim³

et al. 2013

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Size-sorted graphene nanoplatelets are highly desired for fundamental research and technological applications of graphene. Here we show a facile approach for fabricating size-sorted graphene oxide (GO) nanoplatelets by a simple centrifugal method using different dispersion solvents. We found that the small-sized GO nanoplatelets were more effectively separated when dispersed in water or dimethylformamide (DMF) than in an alkali aqueous solution. After several iterations of the centrifugation, the sizes of GO in the supernatant solution were mostly several micrometers. We found that the GO area was not strongly correlated with the C-O content of the GO dispersed in water. However, the size-sorted GO nanoplatelets in DMF showed different C-O content, since DMF can reduce GO nanoplatelets during exfoliation and centrifugation processes.

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Flexible Field Emission from Thermally Welded Chemically Doped Graphene Thin Films

Cited by 31 publications

References 60 publications

Highly flexible and robust N-doped SiC nanoneedle field emitters

Highly flexible and robust N-doped SiC nanoneedle field emitters

Edge field emission of large-area single layer graphene

Size sorting of chemically modified graphene nanoplatelets

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