Confining the polymerization degree of graphitic carbon nitride in porous zeolite-Y and its luminescence

Wan, Wei; Sun, Jiayi; Ye, Shi; Zhang, Q. Y.

doi:10.1039/c8ra04436h

Cited by 11 publications

(6 citation statements)

References 55 publications

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“…Moreover, the full width at half maximum (FWHM) of the PL spectrum at 600 °C becomes wider. A similar temperature dependence of the PL property of annealed melamine powders has already been reported . The redshift of the PL emission at a high annealing temperature is caused by the overlap between two energy bands in the conduction band.…”

Section: Resultssupporting

confidence: 78%

“…Graphite‐like CN structures have upper δ* and lower π* energy bands. By annealing at high temperature, the overlap of the δ* and π* energy bands increases and provides a channel for the excited electrons in the δ* energy band to relax into the lower π* energy bands . This result demonstrates that the annealing at 400 °C increases the graphite‐like CN structures leading to the strong PL intensity.…”

Section: Resultsmentioning

confidence: 87%

“…Fluorescent CN‐based thin films can be prepared by RF magnetron sputtering . Moreover, CN‐based materials can be easily prepared by thermal evaporation method using guanidine carbonate and melamine (C 3 H 6 N 6 ) powders . Note that CN‐based fluorescent materials emit a blue color and are not destroyed by oxidation and moisture, and carbon and nitride atoms are of course not toxic.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characterization of Carbon Nitride Fluorescent Material Using Annealed Melamine

Wada

Ohtani

2019

Physica Status Solidi (b)

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Fluorescent carbon nitride (CN) thin films are fabricated by annealing melamine powder. Four kinds of fabrication methods are tested: (1) annealing melamine powder on glass substrate; (2) annealing spin-coated melamine powder in acetic acid solution on glass substrate; (3) annealing melamine powder in a test tube and evaporating on a glass substrate; (4) spin-coating annealed melamine powder in acetic acid and nitric acid solutions on glass substrates. As a result, method (1) produces fluorescent CN grains when the annealing temperature was over 400 C. Photoluminescence (PL) peaking wavelength is redshifted with an increase of the annealing temperature. However, flat CN thin films cannot be produced. Method (2) cannot produce CN-based thin films; only small particles are found on substrates. Method (3) can drastically improve the surface roughness and produce flat CN thin films. Finally, the method (4) demonstrates that the PL peaking wavelength is blueshifted by nitric acid. Fourier-transform infrared (FT-IR) observation suggests that the protons supplied from nitric acid connect with carbon atoms in carbonyl, generating aldehydes and changing the PL properties.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characterization of Carbon Nitride Fluorescent Material Using Annealed Melamine

Wada

Ohtani

2019

Physica Status Solidi (b)

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“…Figure S1 shows the XRD pattern of the prepared g-C 3 N 4 . Two diffraction peaks at around 13.1 • and 27.3 • in g-C 3 N 4 correspond to the in-plane structure packing of aromatic systems of (100) plane and the interlayer stacking of conjugated aromatic systems of (002) plane, respectively [30,31], which reveals that the prepared g-C 3 N 4 nanosheets is the typical graphitic structure. No diffraction peaks of g-C 3 N 4 were found in the XRD pattern of the Ni 1.5 Co 1.5 S 4 /g-C 3 N 4 , which is probably due to weak scattering intensity and relatively low content of g-C 3 N 4 .…”

Section: Resultsmentioning

confidence: 90%

Synthesis of Hierarchical Porous Ni1.5Co1.5S4/g-C3N4 Composite for Supercapacitor with Excellent Cycle Stability

Jin

Jiang

et al. 2020

Nanomaterials

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In this work, the hierarchical porous Ni1.5Co1.5S4/g-C3N4 composite was prepared by growing Ni1.5Co1.5S4 nanoparticles on graphitic carbon nitride (g-C3N4) nanosheets via a hydrothermal route. Due to the self-assembly of larger size g-C3N4 nanosheets as a skeleton, the prepared nanocomposite possesses a unique hierarchical porous structure that can provide short ions diffusion and fast electron transport. As a result, the Ni1.5Co1.5S4/g-C3N4 composite exhibits a high specific capacitance of 1827 F g−1 at a current density of 1 A g−1, which is 1.53 times that of pure Ni1.5Co1.5S4 (1191 F g−1). In particular, the Ni1.5Co1.5S4/g-C3N4//activated carbon (AC) asymmetric supercapacitor delivers a high energy density of 49.0 Wh kg−1 at a power density of 799.0 W kg−1. Moreover, the assembled device shows outstanding cycle stability with 95.5% capacitance retention after 8000 cycles at a high current density of 10 A g−1. The attractive performance indicates that the easily synthesized and low-cost Ni1.5Co1.5S4/g-C3N4 composite would be a promising electrode material for supercapacitor application.

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“…A first approach was made by Zhang et al using microporous zeolite Y (cage size, 1.2 nm) to encapsulate g-CN by a two-step synthesis resulting in composites of zeolite Y and g-CNs with a confined polymerization degree. 20 Nevertheless, reports on conventional nanocasting approaches using microporous templates, as known for a carbon replica of zeolites, do not exist up to now to the best of our knowledge. 21 − 24 In this work, we investigate the sterical limits of hard-templating approaches for g-CNs using different microporous templates.…”

Section: Introductionmentioning

confidence: 99%

From 1D to 3D Graphitic Carbon Nitride (Melon): A Bottom-Up Route via Crystalline Microporous Templates

et al. 2021

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Herein, we present a novel bottom-up preparation route for heptazine-based polymers (melon), also known as graphitic carbon nitride. The growth characteristics of isolated 1D melon strings in microporous templates are presented and studied in detail. Removal of the microporous silicate template via etching is accompanied by the self-assembly of a 1D melon to stacked 3D structures. The advantages and limitations of the bottom-up approach are shown by using microporous templates with different pore sizes (ETS-10, ZSM-5, and zeolite Y). In accordance with the molecular size of the heptazine units (0.67 nm), a 1D melon can be deposited in ETS-10 with a pore width of about 0.78 nm, whereas its formation in the smaller 0.47 nm pores of ZSM-5 is sterically impeded. The self-assembly of isolated 1D melon to stacked 3D structures offers a novel experimental perspective to the controversial debate on the polymerization degree in 2D sheets of graphitic carbon nitride as micropore sizes below 1 nm confine the condensation degree of heptazine to isolated 1D strands at a molecular level. The growth characteristics and structural features were investigated by X-ray diffraction, N 2 physisorption, scanning transmission electron microscopy/energy-dispersive X-ray analysis, 13 C CP-NMR spectroscopy, and attenuated total reflection–infrared spectroscopy.

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Confining the polymerization degree of graphitic carbon nitride in porous zeolite-Y and its luminescence

Abstract: The composites of porous zeolite-Y and graphitic carbon nitride can be synthesized via a facile two-step method, and the polymerization degree of the latter can be confined by the former.

Cited by 11 publications

References 55 publications

Fabrication and Characterization of Carbon Nitride Fluorescent Material Using Annealed Melamine

Fabrication and Characterization of Carbon Nitride Fluorescent Material Using Annealed Melamine

Synthesis of Hierarchical Porous Ni1.5Co1.5S4/g-C3N4 Composite for Supercapacitor with Excellent Cycle Stability

From 1D to 3D Graphitic Carbon Nitride (Melon): A Bottom-Up Route via Crystalline Microporous Templates

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