Nitrogen-Doped Carbon Quantum Dots with Photoactivation Properties for Ultraviolet Ray Detection DOI

Linhong Liao,

Junchao Qi,

Jie Gao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(32), P. 42632 - 42640

Published: July 31, 2024

Photoactivation is a phenomenon that could enhance the photoluminescence (PL) and photostability upon UV/vis light exposure, which usually observed in CdSe/ZnS quantum dots (QDs). However, photoactivation has been scarcely reported fluorescent carbon (CQDs). Herein, nitrogen-doped (N-CQDs) were prepared through facile solvothermal approach with naphthalenetracarboxylic dianhydride serine as precursors. Upon simple UV irradiation for 10 min, fluorescence yield (QY) of N-CQDs increase up to 10-fold. Based on this phenomenon, explored an ultraviolet (UV) sensor assess intensity radiation sunlight indirectly evaluate UV-blocking efficiency various sunscreen products. Thus, contribution not only provided insight into developing low-cost detector but also opened door development converse-photobleaching properties.

Language: Английский

Rapid synthesis of carbon quantum dot-integrated metal–organic framework nanosheets via electron beam irradiation for selective 5-hydroxymethylfurfural electrooxidation DOI Creative Commons

Qianjia Ni,

Mingwan Zhang,

Bijun Tang

et al.

Advanced Powder Materials, Journal Year: 2025, Volume and Issue: unknown, P. 100267 - 100267

Published: Jan. 1, 2025

Language: Английский

Citations

3
Nitrogen and Sulfur Co-Doped Carbon Dots with Excellent Fluorescent Thermal Stability for Anti-Counterfeiting and Information Encryption DOI
Nouman Ahmed, Manzoor Hussain, Aumber Abbas

et al.

Organic Electronics, Journal Year: 2025, Volume and Issue: 139, P. 107197 - 107197

Published: Jan. 18, 2025

Language: Английский

Citations

2
Unlocking the potential of green-engineered carbon quantum dots for sustainable packaging biomedical applications and water purification DOI Creative Commons
Yasaman Esmaeili, Farzad Toiserkani, Zeinab Qazanfarzadeh

et al.

Advances in Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 103414 - 103414

Published: Jan. 1, 2025

Language: Английский

Citations

2
Radiation-synthesis of covalent bonding heterojunctions for selective solar-driven CO2 reduction DOI
Weidong Hou,

Huazhang Guo,

Kang Wang

et al.

Materials Today, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

Citations

2
Fluorescence Quenching of Graphene Quantum Dots from Orange Peel for Methyl Orange Detection DOI Creative Commons
Weitao Li, Yang Liu,

Xinglong Pang

et al.

Nanomaterials, Journal Year: 2025, Volume and Issue: 15(5), P. 376 - 376

Published: Feb. 28, 2025

Methyl orange (MO) is an organic synthetic dye widely used in laboratory and industrial applications. In settings, it serves as acid-base indicator due to its distinct color change both acidic alkaline environments. Industrially, primarily utilized the textile industry for ultraviolet (UV) absorption properties. However, discharge leakage of methyl into environment can cause severe ecological damage pose potential carcinogenic teratogenic risks human health. Therefore, detecting quantifying concentration various matrices crucial. This study reports synthesis graphene quantum dots (GQDs) from peel a precursor, using ethanol dimethylformamide (DMF) solvents. Cyan (c-GQDs) yellow (y-GQDs) were synthesized through bottom-up hydrothermal method. The difference attributed redshift caused by varying ratio pyridine nitrogen pyrrole nitrogen. These GQDs exhibited notable optical properties, with c-GQDs emitting cyan fluorescence y-GQDs under UV light. To investigate quenching effects, nine commonly dyes tested, all found quench y-GQDs, having most significant effect. peel-derived presence poor dispersion DMF solution. Additionally, possess high specific surface area, abundant functional groups, excellent electronic conductivity, which contribute their effective performance. average thickness (the vertical dimension substrate upwards) was 3.51 nm, confirming graphene-like structure. They emitted within wavelength range 450-530 nm. Notably, linear correlation between intensity (regression coefficient = 0.9954), indicating sensing materials pollutant detection.

Language: Английский

Citations

2
Unlocking the Charge‐Migration Mechanism in S‐Scheme Junction for Photoreduction of Diluted CO2 with High Selectivity DOI
Kai Wang, Qiang Cheng, Weidong Hou

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(8)

Published: Nov. 7, 2023

Abstract The rational design of an S‐scheme heterojunctions in hybrid semiconductors to realize separated charge carriers and sufficient redox ability is considered as attractive way achieve high photocatalytic activity diluted CO 2 reduction (DCR). An heterojunction formed the fibrous Ta O 5 /Ag S nanostructures proposed for improving performance DCR under simulated solar irradiation. Benchmark CH 4 production rates 132.3 µmol g −1 are obtained with 93.1% selectivity over optimal catalyst ASTO‐2. remarkable attributed unique 0D/1D structure effective separation by photoinduced strong internal electric field mechanism. measurements situ X‐ray photoelectron spectroscopy, femtosecond transient absorption electron paramagnetic resonance further confirm carrier transfer pathways following This research can provide a new strategy designing improve conversion.

Language: Английский

Citations

29
The Emerging Star of Carbon Luminescent Materials: Exploring the Mysteries of the Nanolight of Carbon Dots for Optoelectronic Applications DOI
Jiurong Li, Xiujian Zhao, Xiao Gong

et al.

Small, Journal Year: 2024, Volume and Issue: 20(31)

Published: March 10, 2024

Carbon dots (CDs), a class of carbon-based nanomaterials with dimensions less than 10 nm, have attracted significant interest since their discovery. They possess numerous excellent properties, such as tunability photoluminescence, environmental friendliness, low cost, and multifunctional applications. Recently, large number reviews emerged that provide overviews synthesis, applications, composite functionalization. The application CDs in the field optoelectronics has also seen unprecedented development due to optical but them this are relatively rare. With idea deepening broadening understanding applications optoelectronics, review for first time provides detailed summary luminescent solar concentrators (LSCs), light-emitting diodes (LEDs), cells, photodetectors. In addition, definition, categories, synthesis methods briefly introduced. It is hoped can bring scholars more deeper optoelectronic further promote practical CDs.

Language: Английский

Citations

15
3D-Printed MOF Monoliths: Fabrication Strategies and Environmental Applications DOI Creative Commons
Hossein Molavi, Kamyar Mirzaei, Mahdi Barjasteh

et al.

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: Aug. 15, 2024

Metal-organic frameworks (MOFs) have been extensively considered as one of the most promising types porous and crystalline organic-inorganic materials, thanks to their large specific surface area, high porosity, tailorable structures compositions, diverse functionalities, well-controlled pore/size distribution. However, developed MOFs are in powder forms, which still some technical challenges, including abrasion, dustiness, low packing densities, clogging, mass/heat transfer limitation, environmental pollution, mechanical instability during process, that restrict applicability industrial applications. Therefore, recent years, attention has focused on techniques convert MOF powders into macroscopic materials like beads, membranes, monoliths, gel/sponges, nanofibers overcome these challenges.Three-dimensional (3D) printing technology achieved much interest because it can produce many high-resolution with complex shapes geometries from digital models. this review summarizes combination different 3D strategies MOF-based for fabricating 3D-printed monoliths applications, emphasizing water treatment gas adsorption/separation Herein, various fabrication such direct ink writing, seed-assisted in-situ growth, coordination replication solid precursors, matrix incorporation, selective laser sintering, light processing, described relevant examples. Finally, future directions challenges also presented better plan trajectories shaping improved control over structure, composition, textural properties monoliths.

Language: Английский

Citations

15
Synergistic Effects of Amine Functional Groups and Enriched‐Atomic‐Iron Sites in Carbon Dots for Industrial‐Current–Density CO2 Electroreduction DOI
Huazhang Guo, Jithu Raj, Zeming Wang

et al.

Small, Journal Year: 2024, Volume and Issue: 20(32)

Published: March 21, 2024

Abstract Metal phthalocyanine molecules with Me‐N 4 centers have shown promise in electrocatalytic CO 2 reduction (eCO R) for generation. However, iron (FePc) is an exception, exhibiting negligible eCO R activity due to a higher * COOH conversion barrier and stronger binding energy. Here, amine functional groups onto atomic‐Fe‐rich carbon dots (Af‐Fe‐CDs) are introduced via one‐step solvothermal molecule fusion approach. Af‐Fe‐CDs feature well‐defined Fe‐N active sites impressive Fe loading (up 8.5 wt%). The synergistic effect between electron‐donating yielded outstanding ‐to‐CO performance. At industrial‐relevant current densities exceeding 400 mA cm −2 flow cell, achieved >92% selectivity, surpassing state‐of‐the‐art electrocatalysts. situ electrochemical FTIR characterization combined theoretical calculations elucidated that integration significantly reduced energy barriers intermediate formation desorption, enhancing efficiency. proposed offers promising avenue high‐efficiency catalysts elevated atomic‐metal loadings.

Language: Английский

Citations

14
Graphene Quantum Dot‐Modified Mn0.2Cd0.8S for Efficient Overall Photosynthesis of H2O2 DOI Open Access
Wang Wang, Zhongyue Chen, Chengming Li

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

Abstract The photosynthesis of hydrogen peroxide (H 2 O ) via the selective two‐electron oxygen reduction reaction (ORR) is emerging as a promising method for producing this important chemical. However, reliance on sacrificial agents has limited practical application many photocatalysts. Herein, nitrogen‐doped graphene quantum dots (NGQDs) are loaded onto surface Mn x Cd 1‐ S solid solution nanowires to enable overall H in pure water under an air atmosphere. optimized 0.2 0.8 S/NGQDs (M NG5) composite achieves high yield 6885 µmol g −1 h , which 10.4 times and 4.5 higher than that CdS (661 (1522 ), respectively. NGQDs act co‐catalysts, enhancing conductivity system. strong electronegativity polarity incorporated nitrogen functional groups edges enhance ability carbon atoms activate into ·O − . mechanism investigated using situ Fourier transform infrared spectroscopy, intermediate trapping experiments, theoretical calculations. This work offers new insights design non‐noble metal co‐catalyst‐modified photocatalysts sacrificial‐agent‐free production.

Language: Английский

Citations

1