Spectral and Luminescent Characteristics of Products from Exfoliation of Graphitic Carbon Nitride Produced at Various Temperatures

Stroyuk, A. L.; Panasiuk, Ya. V.; Raevskaya, A. E.; Kuchmy, S. Ya.

doi:10.1007/s11237-015-9423-9

Cited by 20 publications

(23 citation statements)

References 16 publications

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“…Later we reported that the exfoliation to SLCN can be successfully performed for a series of bulk GCN samples produced at a different synthesis temperature yielding stable colloidal solutions of SLCN . In the present paper, we continue a study of such colloids and discuss dependences of their spectral properties on the temperature of the melamine polycondensation.…”

Section: Resultsmentioning

confidence: 72%

“…The exfoliated colloidal SLCN sheets are characterized by bright emission with the PL band structure (Figure d) being the same as for the original bulk materials indicating a general mechanism of the radiative recombination in the bulk and single‐layer materials. The PL is emitted in broad bands that can be fitted with combinations of two Gaussian profiles (see an example of the fitting in Figure d, dashed lines).…”

Section: Resultsmentioning

confidence: 79%

“…As shown in ref. , the variation of T p yields a series of powdered samples of bulk GCN with a color varying from bright‐yellow ( T p = 500 °C) to deep‐orange ( T p = 725 °C), while a further temperature increase results in a gradual burning‐out of the samples. An analysis of the diffuse reflectance spectra of the samples (Figure S1, Supporting Information) showed that the absorption bands of GCN originate from direct interband electron transitions, while the bandgap E g varies from 2.83 eV for T p = 500 °C to 2.74 eV for T p = 675 °C.…”

Section: Resultsmentioning

confidence: 99%

“…An analysis of the diffuse reflectance spectra of the samples (Figure S1, Supporting Information) showed that the absorption bands of GCN originate from direct interband electron transitions, while the bandgap E g varies from 2.83 eV for T p = 500 °C to 2.74 eV for T p = 675 °C. At higher temperatures, the absorption band is blurred by additional absorbance that was assigned to the presence of peroxide groups hindering an accurate E g determination …”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Thermal and Photochemical Treatments on Structure and Optical Properties of Single‐Layer Carbon Nitride

Stroyuk

Panasiuk

Raevskaya

et al. 2018

Physica Status Solidi (b)

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The temperature of the synthesis of bulk graphitic carbon nitride (GCN) by the polycondensation of melamine, T p , is found to affect the structure and spectral properties of colloidal single layer carbon nitride (SLCN) nanosheets produced from the bulk GCN via the liquid-phase exfoliation. As T p is elevated the SLCN sheets get decorated with hydroxyl groups and become smaller due to a higher degree of destruction of the original bulk GCN. Both the size decrease and the presence of OH groups in the SLCN contribute to an increase in the photoluminescence (PL) quantum yield growing up to 56% for T p ¼ 700 C. The illumination of colloidal SLCN in air-saturated aqueous solutions results in the oxidation of nanosheets with a partial conversion of amino groups into C─OH groups in reactions with oxygen. The oxidation also results in the fragmentation of SLCN particles into smaller moieties and PL quenching. Oppositely, the illumination in argon-saturated solutions results in the reduction of SLCN sheets with the formation of C─C bonds between the components of adducts of SLCN with the products of a partial polyheptazine hydrolysis as well as between separate SLCN particles accompanied by the elimination of amino and hydroxyl groups.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Thermal and Photochemical Treatments on Structure and Optical Properties of Single‐Layer Carbon Nitride

Stroyuk

Panasiuk

Raevskaya

et al. 2018

Physica Status Solidi (b)

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“…A second weaker emission band at ca. 525 nm is attributed to radiative recombination involving charge carriers captured by traps (structural defects) . In all cases, corresponding lower PL intensities were obtained for the rGO‐containing composites in comparison to CN or CN T (Figs.…”

Section: Resultsmentioning

confidence: 80%

Selective Production of Benzaldehyde Using Metal‐Free Reduced Graphene Oxide/Carbon Nitride Hybrid Photocatalysts

et al. 2018

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Benzyl alcohol was selectively oxidized to benzaldehyde in aqueous solution, at ambient conditions of temperature and pressure, by using a photocatalytic approach, with two types of irradiation sources, namely monochromatic UV−A light (392 nm) and visible light (400‐700 nm). Conversion after 4 h of reaction was more efficient under UV than under visible, with selectivity in excess of 80% for both irradiating sources. Composites of graphitic carbon nitride (g‐C3N4) containing small amounts of reduced graphene oxide (rGO) (up to 1 wt.%) were used as photocatalysts. The presence of rGO was confirmed by spectroscopic and microscopic analyses. Results show that small amounts of rGO phase can considerably enhance the photocatalytic activity of g‐C3N4 based catalysts, the best load being 0.10 wt.%. This improvement is attributed to the critical modification of morphological and electronic properties provided by the presence of rGO.

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Carboxymethylation of Cinnamyl Alcohol with Dimethyl Carbonate over Graphitic Carbon Nitrides

Shcherban,

Kholkina,

Sergiienko

et al. 2023

ChemPlusChem

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A set of graphitic carbon nitride samples was prepared using a straightforward experimental procedure without templates and any subsequent treatments. The materials were studied in‐depth using a range of physical and chemical methods such as X‐ray diffraction, FTIR spectroscopy, elemental analysis (CHN), nitrogen physisorption, SEM, XPS, TPD CO2. The resulting g‐C3N4 was shown to be highly efficient in carboxymethylation of cinnamyl alcohol with dimethyl carbonate yielding up to ca. 82 % of the desired cinnamyl methyl carbonate. In the studied conditions, an increase in the surface N atomic content leads to an increase in selectivity towards the desired carbonate, while a higher surface O content was beneficial for side products. Metal‐free graphitic carbon nitride was shown to be one of the most productive (ca. 2 mol/h kgcat) in the investigated reaction among studied heterogeneous catalysts.

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Spectral and Luminescent Characteristics of Products from Exfoliation of Graphitic Carbon Nitride Produced at Various Temperatures

Cited by 20 publications

References 16 publications

Influence of Thermal and Photochemical Treatments on Structure and Optical Properties of Single‐Layer Carbon Nitride

Influence of Thermal and Photochemical Treatments on Structure and Optical Properties of Single‐Layer Carbon Nitride

Selective Production of Benzaldehyde Using Metal‐Free Reduced Graphene Oxide/Carbon Nitride Hybrid Photocatalysts

Carboxymethylation of Cinnamyl Alcohol with Dimethyl Carbonate over Graphitic Carbon Nitrides

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