Topological carbon nitride: localized photon absorption and delocalized charge carrier separation at intertwined photocatalyst interfaces

2018 ◽  
Vol 5 (3) ◽  
pp. 553-559 ◽  
Author(s):  
M. Z. Rahman ◽  
J. Moffatt ◽  
N. Spooner
Keyword(s):  
Charge Carrier ◽  
Carbon Nitride ◽  
Photon Absorption ◽  
Amorphous Phases ◽  
Carrier Separation ◽  
First Time

We here introduce, for the first time, a topological carbon nitride (TCN) with built-in crystalline–amorphous phases.

Degradation of Foron Dye by Means of Orderly Dispersion of MoS2 Nanoparticles on Mesoporous ZnO Systems Using Visible Light

2019 ◽  
Vol 11 (11) ◽  
pp. 1531-1539
Author(s):  
I. A. Mkhalid
Keyword(s):  
Charge Carrier ◽  
Dye Degradation ◽  
High Capacity ◽  
Blue Dye ◽  
Mesoporous Zno ◽  
Large Pore Volume ◽  
Carrier Separation ◽  
Xrd Patterns ◽  
First Time ◽  
Accelerated Charge

For the first time, we in this study prepared uniform MoS2 nanoparticles on ZnO mesoporous. XRD patterns established that the synthesized ZnO and MoS2/ZnO samples were composed of ZnO phase. The TEM results revealed that MoS2 and ZnO were very close to each other, with 4–8 nm in sizes of particles. The MoS2/ZnO nanocomposites have many advantages, and some of these advantages are large surface area (105 m2g–1 and large pore volume (0.19 cm3g–1. Foron blue dye degradation over 3 wt% MoS2/ZnO nanocomposite was 254 times larger than that of mesoporous zinc oxide. Also, Foron blue dye degradation over 3 wt% MoS2/ZnO nanocomposite was 1.8 and 1.2 times greater than that of 0.5 wt% MoS2/ZnO and 1 wt% MoS2/ZnO nanocomposite, respectively. The increased Foron blue dye degradation by increase wt% of MoS2, due to increased separation of charge carrier and high capacity of light-harvesting. Moreover, high foron blue dye degradation was due to formation of a heterostructure between ZnO and MoS2, which accelerated charge carrier separation and improved degradation efficiency. The XPS and HRTEM results revealed that the MoS2 nanoparticles were deposited on the ZnO surface.

In situ textured carbon nitride photoanodes with enhanced photoelectrochemical activity by band-gap state modulation

2020 ◽  
Vol 8 (45) ◽  
pp. 24005-24012
Author(s):  
Miaoyan Huang ◽  
Haipeng Wang ◽  
Wan Li ◽  
Yan-Ling Zhao ◽  
Rui-Qin Zhang
Keyword(s):  
Charge Carrier ◽  
Band Gap ◽  
Water Splitting ◽  
Carbon Nitride ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Activity ◽  
Carrier Separation ◽  
Gap State

As promising photoelectrodes in photoelectrochemical water splitting cells, the photoelectrochemical activity of oxygen-doped CN films can be enhanced by a band-gap state modulation strategy to effectively improve the charge carrier separation.

scholarly journals Mechanism of visible photon absorption: unveiling of the C3N4–ZnO photoactive interface by means of EPR spectroscopy

2020 ◽  
Vol 1 (7) ◽  
pp. 2357-2367 ◽  
Author(s):  
Erik Cerrato ◽  
Maria Cristina Paganini
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Epr Spectroscopy ◽  
Photon Absorption ◽  
Carrier Separation ◽  
Visible Photon

This work unambiguously describes the direct-Z scheme governing the charge carrier separation induced by visible light of the C3N4–ZnO heterojunction.

scholarly journals Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3912
Author(s):  
Marta Jiménez-Salcedo ◽  
Miguel Monge ◽  
María Teresa Tena
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Carbon Nitride ◽  
Plasmonic Nanoparticles ◽  
Ag Nps ◽  
One Pot ◽  
Organometallic Precursor ◽  
Carrier Separation ◽  
The One ◽  
Two Populations

Au-Ag/g-C3N4 nanohybrids 2–3 were synthesized by the one-pot self-reduction of the organometallic precursor [Au2Ag2(C6F5)4(OEt2)2]n in the presence of graphitic carbon nitride (g-C3N4), leading to two populations of alloyed Au-Ag nanoparticles (NPs) of different size and composition on the surface of g-C3N4, i.e., Ag-enriched Au-Ag NPs of smaller size and Au-enriched Au-Ag NPs of larger size. The combination of these two types of plasmonic NPs with g-C3N4 semiconductor displays enhanced photocatalytic properties towards the degradation of ibuprofen under visible light by the increased charge carrier separation provided by the inclusion of the plasmonic NPs on g-C3N4.

Enhanced charge carrier separation of manganese(ii)-doped graphitic carbon nitride: formation of N–Mn bonds through redox reactions

2018 ◽  
Vol 6 (15) ◽  
pp. 6238-6243 ◽  
Author(s):  
Haiping Li ◽  
Yuguo Xia ◽  
Tingxia Hu ◽  
Quanhua Deng ◽  
Na Du ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Redox Reactions ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Inert Gas ◽  
Graphitic Carbon Nitride ◽  
Photogenerated Charge Carrier ◽  
Nitride Formation ◽  
Carrier Separation

MnII-doped g-C3N4 obtained through redox reactions between a permanganate and urea upon calcination in an inert gas exhibits enhanced photogenerated charge carrier separation.

Dissolution and Performing Homogeneous Photocatalysis of Polymeric Carbon Nitride

2018 ◽  
Author(s):  
Chaofeng Huang ◽  
Jing Wen ◽  
Yanfei Shen ◽  
Fei He ◽  
Li Mi ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Carbon Nitride ◽  
Heterogeneous Catalysts ◽  
Methane Sulfonic Acid ◽  
Environment Friendly ◽  
The Poor ◽  
Catalytic Sites ◽  
Homogeneous Photocatalysis ◽  
Polymeric Carbon ◽  
First Time

<a></a><a>As a metal-free conjugated polymer, carbon nitride (CN) has attracted tremendous attention as heterogeneous (photo)catalysts. </a><a></a><a>By following prototype of enzymes, making all catalytic sites of accessible via homogeneous reactions is a promising approach toward maximizing CN activity, but hindered due to </a><a></a><a>the poor insolubility of CN</a>. Herein, we report the dissolution of CN in environment-friendly methane sulfonic acid and the homogeneous photocatalysis driven by CN for the first time with the activity boosted up to 10-times, comparing to the heterogeneous counterparts. Moreover, facile recycling and reusability, the <a>hallmark</a> of heterogeneous catalysts, were kept for the homogeneous CN photocatalyst via reversible precipitation using poor solvents. It opens new vista of CN in homogeneous catalysis and offers a successful example of polymeric catalysts in bridging gaps of homo/heterogeneous catalysis.

scholarly journals Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maria Ruchkina ◽  
Dina Hot ◽  
Pengji Ding ◽  
Ali Hosseinnia ◽  
Per-Erik Bengtsson ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Laser Pulses ◽  
Photon Absorption ◽  
Gas Flows ◽  
Single Shot ◽  
Photon Excitation ◽  
Fs Laser ◽  
Thermal Grating ◽  
Grating Spectroscopy ◽  
First Time

AbstractLaser-induced grating spectroscopy (LIGS) is for the first time explored in a configuration based on the crossing of two focused femtosecond (fs) laser pulses (800-nm wavelength) and a focused continuous-wave (cw) laser beam (532-nm wavelength). A thermal grating was formed by multi-photon absorption of the fs-laser pulses by $$\hbox {N}_{{2}}$$ N 2 with a pulse energy around 700 $$\upmu $$ μ J ($$\sim $$ ∼ 45 TW/$$\hbox {cm}^{2}$$ cm 2 ). The feasibility of this LIGS configuration was investigated for thermometry in heated nitrogen gas flows. The temperature was varied from room temperature up to 750 K, producing strong single-shot LIGS signals. A model based on the solution of the linearized hydrodynamic equations was used to extract temperature information from single-shot experimental data, and the results show excellent agreement with the thermocouple measurements. Furthermore, the fluorescence produced by the fs-laser pulses was investigated. This study indicates an 8-photon absorption pathway for $$\hbox {N}_{{2}}$$ N 2 in order to reach the $$\hbox {B}^{3}\Pi _{g}$$ B 3 Π g state from the ground state, and 8 + 5 photon excitation to reach the $$\hbox {B}^{2}\Sigma _{u}^{+}$$ B 2 Σ u + state of the $$\hbox {N}_{2}^{+}$$ N 2 + ion. At pulse energies higher than 1 mJ, the LIGS signal was disturbed due to the generation of plasma. Additionally, measurements in argon gas and air were performed, where the LIGS signal for argon shows lower intensity compared to air and $$\hbox {N}_{{2}}$$ N 2 .

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