Simultaneous reduction and nitrogen doping of graphite oxide by using electron beam irradiation

Kang, Mee Joo; Lee, D. H.; Yang, Junghoon; Kang, Yong‐Mook; Jung, Hyun Suk

doi:10.1039/c5ra20199c

Cited by 18 publications

(6 citation statements)

References 46 publications

(56 reference statements)

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“…In addition, the material properties can be tuned by removing oxygen at nearly room temperature via chemical route 16,17,[19][20][21][22][23] . Further chemical reduction is possible via e-beam 24 and laser irradiation 25 . It is well-established from the electrical characterizations that a chemical reduction process can restore semi-metallic property of GO from an insulator 17,[26][27][28][29] .…”

mentioning

confidence: 99%

Valence‐band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics

Yamaguchi

Ogawa

Watanabe

et al. 2016

Physica Status Solidi (a)

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We report valence-band electronic structure evolution of graphene oxide (GO) upon its thermal reduction. The degree of oxygen functionalization was controlled by annealing temperature, and an electronic structure evolution was monitored using real-time ultraviolet photoelectron spectroscopy. We observed a drastic increase in the density of states around the Fermi level upon thermal annealing at ???600?????C. The result indicates that while there is an apparent bandgap for GO prior to a thermal reduction, the gap closes after an annealing around that temperature. This trend of bandgap closure was correlated with the electrical, chemical, and structural properties to determine a set of GO material properties that is optimal for optoelectronics. The results revealed that annealing at a temperature of ???500?????C leads to the desired properties, demonstrated by a uniform and an order of magnitude enhanced photocurrent map of an individual GO sheet compared to an as-synthesized counterpart

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mentioning

confidence: 99%

Valence‐band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics

Yamaguchi

Ogawa

Watanabe

et al. 2016

Physica Status Solidi (a)

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“…1a. All the G bands of the E-beam-irradiated ACFs were red-shifted from 1584 cm -1 , indicating that the sp 2 domains were repaired by E-beam irradiation [18]. In addition, the intensity of the D band was substantially decreased.…”

Section: Structural Propertiesmentioning

confidence: 75%

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

Park¹,

Lee²,

Jung³

et al. 2016

Carbon letters

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Activated carbon fiber (ACF) surfaces are modified using an electron beam under different aqueous solutions to improve the NO gas sensitivity of a gas sensor based on ACFs. The oxygen functional group on the ACF surface is changed, resulting in an increase of the number of non-carbonyl (-C-O-C-) groups from 32.5% for pristine ACFs to 39.53% and 41.75% for ACFs treated with hydrogen peroxide and potassium hydroxide solutions, respectively. We discover that the NO gas sensitivity of the gas sensor fabricated using the modified ACFs as an electrode material is increased, although the specific surface area of the ACFs is decreased because of the recovery of their crystal structure. This is attributed to the static electric interaction between NO gas and the non-carbonyl groups introduced onto the ACF surfaces.

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“…The reduction degree of RGO could be controlled by varying the electron beam dose from 0 to 40 kGy. In another report [27], GO in a water/ethanol system purged with N 2 gas was reduced by electron beam absorbed doses ranging from 50 to 200 kGy. N 2 -doped graphene could be obtained by irradiating a GO aqueous solution containing isopropyl alcohol and aqueous NH 3 with electron beams with absorbed doses of 100, 200, and 300 kGy [28].…”

Section: H Ohmentioning

confidence: 99%

Electrical, thermal and electrochemical properties of γ-ray-reduced graphene oxide

Atta

Ashry

Nasr

et al. 2021

Int J Miner Metall Mater

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The properties of γ-ray-reduced graphene oxide samples (GRGOs) were compared with those of hydrazine hydrate-reduced graphene oxide (HRGO). Fourier transform infrared spectroscopy, X-ray diffractometry, Raman spectroscopy, Brunauer-Emmett-Teller surface area analysis, thermogravimetric analysis, electrometry, and cyclic voltammetry were carried out to verify the reduction process, structural changes, and defects of the samples, as well as to measure their thermal, electrical, and electrochemical properties. Irradiation with γ-rays distorted the structure of GRGOs and generated massive defects through the extensive formation of new smaller sp 2 -hybridized domains compared with those of HRGO. The thermal stability of GRGOs was higher than that of HRGO, indicating the highly efficient removal of thermally-labile oxygen species by γ-rays. RRGO prepared at 80 kGy showed a pseudocapacitive behavior comparable with the electrical double-layer capacitance behavior of HRGO. Interestingly, the specific capacitance of GRGO was enhanced by nearly three times compared with that of HRGO. These results reflect the advantages of radiation reduction in energy storage applications.

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Simultaneous reduction and nitrogen doping of graphite oxide by using electron beam irradiation

Abstract: Nitrogen-doped graphenes were successfully obtained by electron beam irradiation from graphite oxide colloid solution in the presence of aqueous ammonia at room temperature under ambient conditions.

Cited by 18 publications

References 46 publications

Valence‐band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics

Valence‐band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

Electrical, thermal and electrochemical properties of γ-ray-reduced graphene oxide

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