Molecular routes syntheses of graphite-like C&amp;ndash;N compounds with various N/C ratios in high pressure and temperature

Horibe, Taishi; Kusaba, Keiji; Niwa, Ken; Hasegawa, Masashi; Yasuda, Keisuke; Ishigami, Ryoya

doi:10.2109/jcersj2.16123

Cited by 5 publications

(5 citation statements)

References 10 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The typical diffraction peak at around 27° has also been found in other nitrogendoped graphene or graphite materials. In fact, Horibe et al reported that this interplanar distance decreases monotonously with increasing N/C content ratio [38,39]. According to Horibe's reports, an interplanar distance of 3.31 Å would correspond to an N/C atomic ratio close to 0.6, which is actually very close to the one found by X-ray photoelectron spectroscopy for the materials under study.…”

Section: X-ray Diffraction (Xrd) Measurementssupporting

confidence: 75%

See 1 more Smart Citation

Nitrogen-carbon graphite-like semiconductor synthesized from uric acid

Dante¹,

Chamorro‐Posada

Vázquez-Cabo

et al. 2017

Carbon

View full text Add to dashboard Cite

A new carbon-nitrogen organic semiconductor has been synthesized by pyrolysis of uric acid. This layered carbon-nitrogen material contains imidazole-, pyridine (naphthyridine)-and graphitic-like nitrogen, as evinced by infrared and X-ray photoelectron spectroscopies. Quantum chemistry calculations support that it would consist of a 2D polymeric material held together by hydrogen bonds. Layers are stacked with an interplanar distance between 3.30 and 3.36 Å, as in graphite and coke. Terahertz spectroscopy shows a behavior similar to that of amorphous carbons, such as coke, with non-interacting layers. This material features substantial differences from polymeric carbon nitride, with some characteristics closer to those of nitrogen-doped graphene, in spite of its higher nitrogen content. The direct optical band gap, dependent on the polycondensation temperature, ranges from 2.10 to 2.32 eV. Although in general the degree of crystallinity is low, in the material synthesized at 600 °C some spots with a certain degree of crystallinity can be found.

show abstract

Section: X-ray Diffraction (Xrd) Measurementssupporting

confidence: 75%

“…9) and by elemental quantification of the carbon, nitrogen and oxygen contents ( Table 1). respectively [39][40][41][42][43][44][45], and relative weight percent (wt%) values are presented in Table 3.…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

Nitrogen-carbon graphite-like semiconductor synthesized from uric acid

Dante¹,

Chamorro‐Posada

Vázquez-Cabo

et al. 2017

Carbon

View full text Add to dashboard Cite

show abstract

“…Other nitrogen-doped graphene or graphitic materials also feature the diffraction peak at around 27°. In fact, Horibe et al found that the interplanar distance monotonously decreased as the N/C content ratio increased [26,27]. However, other factors must be considered, provided that in pure carbon materials the interplanar distance can vary from 3.37 to 3.50 Å depending on the degree of layer-ordered stacking.…”

Section: X-ray Diffraction Measurementsmentioning

confidence: 99%

Comparison of the activities of C2N and BCNO towards Congo red degradation

Dante¹,

Martín-Ramos

Chamorro‐Posada

et al. 2019

Materials Chemistry and Physics

View full text Add to dashboard Cite

An n-type organic carbon nitride semiconductor, C 2 N, was synthesized by the pyrolysis of uric acid, and its properties were investigated by scanning electron and transmission electron microscopies, X-ray powder diffraction, and vibrational, UV-visible and X-ray photoelectron spectroscopies. This novel material, composed of crystalline flakes, featured a broad absorption centered at 700 nm, possibly due to charge transfer, and a 2.49 eV band gap. Its catalytic performance was assessed for the treatment of effluents with the diazo dye Congo red, comparing it with that of boron carbon nitrogen oxide, BCNO. Both wide band gap semiconductors exhibited decolorizing activity in the dark, although the mechanisms were different and were not photocatalytic: BCNO was more effective towards the adsorptioncoordination due to the presence of B-O, while C 2 N was effective towards the adsorption and the advancement of the oxidation reaction. Their kinetic constants (0.19 and 0.02 min-1 for BCNO and C 2 N, respectively) were comparable to those of intermetallic compounds studied for azo dyes degradation in dark conditions. In view of the high color removal efficiency (97% after 20 min) and good reusability of BCNO, this study suggests a potential application of this catalyst for wastewater treatment, alone or in combination with C 2 N.

show abstract

“…Several HPHT experiments using large-volume presses, such as piston-cylinder apparatus, belt-type press, and multianvil press have also been performed. Various analytical methods such as X-ray diffraction measurements, Raman and infrared (IR) spectra, X-ray photoelectron spectroscopy, and transmission electron microscope with electron energy loss spectroscopy have been used to evaluate crystallinity, chemical compositions, and bonding of the reaction products. ,− It has been reported that the N/C ratio of carbon-nitride materials decreases with increasing temperature, in the case where synthesis focused on 1,2,4-triazole (C 2 N 3 H 3 ) and melamine (C 3 N 6 H 6 ) . Graphitic C 3 N 4 decomposed into diamond and probably N 2 above 1073–1173 K at 22–25 GPa .…”

Section: Introductionmentioning

confidence: 99%

Polymerization Mechanism of Nitrogen-Containing Heteroaromatic Compound Under High-Pressure and High-Temperature Conditions

et al. 2020

View full text Add to dashboard Cite

Hydrogenated carbon nitride is synthesized by polymerization of 1,5-naphthyridine, a nitrogen-containing heteroaromatic compound, under high-pressure and high-temperature conditions. The polymerization progressed significantly at temperatures above 573 K at 0.5 GPa and above 623 K at 1.5 GPa. The reaction temperature was relatively lower than that observed for pure naphthalene, suggesting that the reaction temperature is considerably lowered when nitrogen atoms exist in the aromatic ring structure. The polymerization reaction largely progresses without significant change in the N/C ratio. Three types of dimerization are identified; naphthylation, exact dimerization, and dimerization with hydrogenation as determined from the gas chromatograph–mass spectrometry analysis of soluble products. Infrared spectra suggest that hydrogenation products were likely to be formed with sp3 carbon and NH bonding. Solid-state 13C nuclear magnetic resonance reveals that the sp3/sp2 ratio is 0.14 in both the insoluble solids synthesized at 0.5 and 1.5 GPa. Not only the dimers but also soluble heavier oligomers and insoluble polymers formed through more extensive polymerization. The major reaction mechanism of 1,5-Nap was common to both the 0.5 and 1.5 GPa experiments, although the required reaction temperature increased with increasing pressure and aromatic rings preferentially remained at the higher pressure.

show abstract

Molecular routes syntheses of graphite-like C–N compounds with various N/C ratios in high pressure and temperature

Cited by 5 publications

References 10 publications

Nitrogen-carbon graphite-like semiconductor synthesized from uric acid

Nitrogen-carbon graphite-like semiconductor synthesized from uric acid

Comparison of the activities of C2N and BCNO towards Congo red degradation

Polymerization Mechanism of Nitrogen-Containing Heteroaromatic Compound Under High-Pressure and High-Temperature Conditions

Contact Info

Product

Resources

About