Nitrogen vacancy and hydrogen substitution mediated tunable optoelectronic properties of g-C3N4 2D layered structures: Applications towards blue LED to broad-band photodetection

Ghosh, Arnab; Saini, Himanshu; Sarkar, Anish; Guha, Puspendu; Samantara, Aneeya K.; Thapa, Ranjit; Mandal, Suman; Mandal, Ajoy; Behera, J. N.; Ray, S. K.; Goswami, Dipak Kumar

doi:10.1016/j.apsusc.2021.149773

Cited by 18 publications

(11 citation statements)

References 70 publications

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“…However, limited reports on g-C 3 N 4 demonstrate oxidation reactions promoted by direct hole oxidation . This is because g-C 3 N 4 does not have the required thermodynamic driving energy to form hydroxyl free radicals (oxidants). , Besides its utilization in photocatalysis, g-C 3 N 4 is explored for sensing, light-emitting diodes and imaging that harnesses its photoluminescent (PL) property. − …”

Section: G-c3n4: a Promising Photocatalyst With Tunable Optoelectroni...mentioning

confidence: 99%

Extending the Optical Absorption Limit of Graphitic Carbon Nitride Photocatalysts: A Review

Chandrappa,

Galbao,

Furube

et al. 2023

ACS Appl. Nano Mater.

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Due to its chemical/thermal stability, metal-free nature, abundance, low toxicity, cost-effectiveness, high surface area, tunable properties, and ease of synthesis, graphitic carbon nitride (g-C 3 N 4 ) is a promising material for applications in catalysis, sensing, energy storage and optoelectronics. By virtue of its optical band gap, g-C 3 N 4 has been extensively used to drive a range of photocatalytic reactions, such as H 2 generation, CO 2 reduction, N 2 fixation, and organic transformation, to name a few. Despite these prospects, significant improvement in extending its optical absorption is essential because g-C 3 N 4 absorbs light only up to 460 nm (≈10% of the incoming sunlight). Thus, reducing its band gap to harness a wider part of the sunlight is a key approach to advancing the solar energy conversion efficiency of g-C 3 N 4 . In this direction, the effect of (i) improving the degree of polymerization, (ii) molecular and elemental doping, (iii) distorting planar structure, (iv) inducing nitrogen vacancies, and (v) tuning the C/N ratio of g-C 3 N 4 on red-shifting the optical absorption is analyzed in detail. A comprehensive correlation between the synthesis approach/conditions−structure−optical property is established. Rational guidelines on extending the spectral response of g-C 3 N 4 toward the visible/near-infrared region and using low-energy photons to drive photocatalytic reactions efficiently are detailed. The insights presented will help to utilize the full potential of g-C 3 N 4 to enhance the solar fuel generation efficiency and in understanding the mechanism of light absorption.

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Section: G-c3n4: a Promising Photocatalyst With Tunable Optoelectroni...mentioning

confidence: 99%

Extending the Optical Absorption Limit of Graphitic Carbon Nitride Photocatalysts: A Review

Chandrappa,

Galbao,

Furube

et al. 2023

ACS Appl. Nano Mater.

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“…22,26 There are many ways to improve the properties of g-C 3 N 4 , including amorphization, creation of vacancy sites, delamination of the layer thickness, composite preparation, and functionalization/doping. 27,28 Especially, functionalization/doping of heteroatoms/structures will enhance the photocatalytic activity of pristine g-C 3 N 4 . 29 The doping of heteroatoms allows modifications in the distribution of charges.…”

Section: ■ Introductionmentioning

confidence: 99%

“…27,28 Especially, functionalization/doping of heteroatoms/structures will enhance the photocatalytic activity of pristine g-C 3 N 4 . 29 The doping of heteroatoms allows modifications in the distribution of charges. 30 Upon functionalization, the formation of a heterojunction serves various purposes in improving the properties of the composites.…”

Section: ■ Introductionmentioning

confidence: 99%

Green Fluorine-Confined 2D layered Graphitic Carbon Nitride (g-C₃N₄) Nanosheets for Electrocatalysts and Photocatalysts toward the Detection and Degradation of Metol Drugs in Wastewater

Vasu

Ravi

Subramaniyam

et al. 2023

ACS Appl. Eng. Mater.

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The "To carry two faces under one hood" technique is used in this article to study how hazardous environmental contaminants are removed by photocatalysis and electrochemistry. By the thermal decomposition approach, nanosheets of F-doped graphitic carbon nitride (g-C 3 N 4 ) are synthesized using varying weight percentages of NH 4 F (1, 2, and 3 wt %). Various characterization techniques are applied to study the physiochemical properties of the synthesized F/g-C 3 N 4 nanosheets. The electrochemical characteristics of F/g-C 3 N 4 nanosheets are investigated by decorating a screen-printed carbon electrode (SPCE) with F/g-C 3 N 4 and successfully utilizing it for the detection of the organic water effluent metol. F/g-C 3 N 4 exhibits excellent sensitivity, stability, repeatability, and reproducibility toward the detection of metol with a lower limit of detection (7.483 nM) in the linear range of 0.2−40 μM. The real-time potential application of the decorated electrode for the detection of metol in various real water samples shows excellent recovery percentages. F/g-C 3 N 4 (2 wt %) has a lower band gap with better charge-transfer properties when compared to bulk g-C 3 N 4 and F/g-C 3 N 4 (1 and 3 wt %). A higher photocatalytic degradation efficiency of 80% is obtained within a short treatment time (60 min) using F2/g-C 3 N 4 . The visible light-assisted metol degradation process follows pseudo-firstorder kinetics. Moreover, gas chromatography−mass spectrometry (GC−MS) analysis further validates the degradation response and proposes potential degradation pathways. Investigating the toxicity of the treated water using green gram seeds shows that the treated water is safe to consume and does not contain any toxins. In this respect, F/g-C 3 N 4 nanosheets are outstanding electrophotocatalytic materials that are extremely effective and have a wide range of applications.

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“…The exploration of the optical characteristics of nanostructured materials and their hybrids, especially group II–VI or III–V semiconductor materials, has been accelerated by the ongoing demand for effective, flexible display and light-emitting devices. , Due to their innovative optical and electrical properties, next-generation flexible optoelectronic devices made of two-dimensional (2D) nanomaterials like transition-metal dichalcogenides and graphene have recently drawn a lot of interest. − Since g-C 3 N 4 , a 2D polymeric semiconductor resembling graphene and made of layered (tri-s-)triazine units, was initially investigated as an emerging metal-free visible-light-induced photocatalyst for H 2 production, it has been extensively used in the photocatalysis and electrocatalysis fields. − Like the majority of semiconductor materials, GCN nanomaterials also have special PL4 features that result from the radiative transition between the π* or δ* antibonding orbitals [conduction band (CB) of sp 2 C–N bonds] and the lone pair (LP) valence band (VB) in the edge N 2p orbitals. , GCN nanomaterials are desirable in biosensing, chemical sensing, phototherapy, and bioimaging due to their minimal toxicity, excellent photostability, and outstanding biocompatibility. Due to the wide bandgap of bare GCN nanomaterials, such applications are typically limited to lower photoluminescence (PL) quantum yield (QY) and shorter PL wavelength (violet to blue). − …”

Section: Introductionmentioning

confidence: 99%

Boron-Doped Exfoliated g-C₃N₄ Nanosheet-Based Phosphors for White Light-Emission and Photocatalytic Degradation

Harikrishnan,

Rajaram,

Natarajan

et al. 2023

ACS Appl. Nano Mater.

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A potential replacement for two-dimensional (2D)inorganic semiconductors in photocatalysis has developed quickly in the form of graphitic carbon nitride [g-C 3 N 4 (GCN)], a 2D-organic semiconductor; nevertheless, very few investigations have been conducted to date about its use in optoelectronic devices. In light of the demands of light-emitting diodes (LED) with effective injected carrier recombination, we propose the report on the fabrication of Bdoped exfoliated g-C 3 N 4 (BEGCN) with substantially altered optical/ electronic characteristics and a unique structural backbone and illustrate their potential applications in LED devices. The role of exploitation and boron incorporation toward modulating the optical properties of GCN was studied. BEGCN has very high photoluminescence (PL); EGCN and GCN exhibit vanishingly low PL and 2.67 and 2.73 eV smaller bandgap than BEGCN (E g = 2.81 eV) and manifest visibly white emission. An interesting electronic structure derived from the native defect states of hBN and π, π*, and n states of GCN is bestowed by the occurrence of these two distinct domain types in BEGCN nanosheets. The BEGCN nanosheets demonstrate distinctive optical features in PL emission, which makes the material incredible for the development of high-performance LEDs. The photocatalytic performance was also carried out to correlate the PL characteristics with light-induced RhB degradation of GCN (93%), EGCN (86%), and BEGCN (82%) within 180 min. Degradation efficiency decreased due to the boron incorporation, which directly affects the absorption of photons by creating a blocking effect between the catalyst surface and the light source. Next-generation light-emitting and display devices featuring exceptional luminescence stability may be possible with the construction of BEGCN nanosheets with doped EGCN and B-nanodomains and the emergence of outstanding light-emission properties.

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Nitrogen vacancy and hydrogen substitution mediated tunable optoelectronic properties of g-C3N4 2D layered structures: Applications towards blue LED to broad-band photodetection

Cited by 18 publications

References 70 publications

Extending the Optical Absorption Limit of Graphitic Carbon Nitride Photocatalysts: A Review

Extending the Optical Absorption Limit of Graphitic Carbon Nitride Photocatalysts: A Review

Green Fluorine-Confined 2D layered Graphitic Carbon Nitride (g-C₃N₄) Nanosheets for Electrocatalysts and Photocatalysts toward the Detection and Degradation of Metol Drugs in Wastewater

Boron-Doped Exfoliated g-C₃N₄ Nanosheet-Based Phosphors for White Light-Emission and Photocatalytic Degradation

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Nitrogen vacancy and hydrogen substitution mediated tunable optoelectronic properties of g-C3N4 2D layered structures: Applications towards blue LED to broad-band photodetection

Cited by 18 publications

References 70 publications

Extending the Optical Absorption Limit of Graphitic Carbon Nitride Photocatalysts: A Review

Extending the Optical Absorption Limit of Graphitic Carbon Nitride Photocatalysts: A Review

Green Fluorine-Confined 2D layered Graphitic Carbon Nitride (g-C3N4) Nanosheets for Electrocatalysts and Photocatalysts toward the Detection and Degradation of Metol Drugs in Wastewater

Boron-Doped Exfoliated g-C3N4 Nanosheet-Based Phosphors for White Light-Emission and Photocatalytic Degradation

Contact Info

Product

Resources

About

Green Fluorine-Confined 2D layered Graphitic Carbon Nitride (g-C₃N₄) Nanosheets for Electrocatalysts and Photocatalysts toward the Detection and Degradation of Metol Drugs in Wastewater

Boron-Doped Exfoliated g-C₃N₄ Nanosheet-Based Phosphors for White Light-Emission and Photocatalytic Degradation