Recent progress in g-C3N4 quantum dots: synthesis, properties and applications in photocatalytic degradation of organic pollutants

2020 ◽  
Vol 8 (2) ◽  
pp. 485-502 ◽  
Author(s):  
Teng Wang ◽  
Chunyang Nie ◽  
Zhimin Ao ◽  
Shaobin Wang ◽  
Taicheng An
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Recent Progress ◽  
Top Down ◽  
Bottom Up ◽  
Synthesis Properties ◽  
Catalytic Removal

Graphitic-C3N4 quantum dots (g-C3N4QDs), which can be prepared by top-down and bottom-up synthesis, exhibit excellent optical features. They can act as different roles during the photo(electro)catalytic removal of organic pollutants.

(Invited) In Vitro and In Vivo Near-Infrared Imaging with Biocompatible Bottom-up and Top-Down-Synthesized Graphene Quantum Dots

2020 ◽  
Vol MA2020-01 (6) ◽  
pp. 648-648
Author(s):  
Anton V Naumov ◽  
Md Tanvir Hasan ◽  
Elizabeth Campbell ◽  
Ching-Wei Lin ◽  
Angela M. Belcher
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Graphene Quantum Dots ◽  
Top Down ◽  
Near Infrared Imaging ◽  
Bottom Up

Recent progress in carbon quantum dots: synthesis, properties and applications in photocatalysis

2017 ◽  
Vol 5 (8) ◽  
pp. 3717-3734 ◽  
Author(s):  
Ru Wang ◽  
Kang-Qiang Lu ◽  
Zi-Rong Tang ◽  
Yi-Jun Xu
Keyword(s):  
Quantum Dots ◽  
Recent Progress ◽  
Carbon Quantum Dots ◽  
Synthesis Properties ◽  
Challenges And Opportunities ◽  
Photocatalytic Applications

The recent progress in the synthesis, properties and photocatalytic applications of carbon quantum dots (CQDs) has been elaborately demonstrated, and some perspectives on the challenges and opportunities for future exploration in this arena are discussed.

A Critical Review of Graphene Quantum Dots: Synthesis and Application in Biosensors

NANO ◽  
2021 ◽  
pp. 2130001
Author(s):  
Jialu Shen ◽  
Weifeng Chen ◽  
Zihan Yang ◽  
Guo Lv ◽  
Jie Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Critical Review ◽  
Graphene Quantum Dots ◽  
Top Down ◽  
Bottom Up ◽  
Advantages And Disadvantages ◽  
Future Developments ◽  
Potential Applications

Graphene quantum dots (GQDs) have aroused widespread attention because of their remarkable properties and potential applications. Herein, we discuss both the top-down and bottom-up strategies for the synthesis of GQDs. Different processes are presented to study their characteristics and the influence on the final properties of GQDs. The respective advantages and disadvantages of these methods are summarized. With regard to some important or novel ones, mechanisms are proposed for reference. In addition, the application of GQDs in biosensors is highlighted in detail. At last, we put forward some problems to be solved and give a brief prospect in their future developments. This review is very useful for quickly gaining knowledge and experience for synthesizing GQDs and designing the related novel biosensors.

Recent progress in magnetic iron oxide–semiconductor composite nanomaterials as promising photocatalysts

Nanoscale ◽  
2015 ◽  
Vol 7 (1) ◽  
pp. 38-58 ◽  
Author(s):  
Wei Wu ◽  
Changzhong Jiang Changzhong Jiang ◽  
Vellaisamy A. L. Roy
Keyword(s):  
Iron Oxide ◽  
Photocatalytic Degradation ◽  
Environmental Protection ◽  
Organic Pollutants ◽  
Recent Progress ◽  
Oxide Semiconductor ◽  
Composite Nanomaterials ◽  
Magnetic Iron Oxide ◽  
Challenging Tasks

Photocatalytic degradation of toxic organic pollutants is a challenging tasks in ecological and environmental protection.

Superior photodynamic effect of carbon quantum dots through both type I and type II pathways: Detailed comparison study of top-down-synthesized and bottom-up-synthesized carbon quantum dots

Carbon ◽  
2018 ◽  
Vol 140 ◽  
pp. 616-623 ◽  
Author(s):  
Timothy J. Pillar-Little ◽  
Namal Wanninayake ◽  
Leona Nease ◽  
David K. Heidary ◽  
Edith C. Glazer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Detailed Comparison ◽  
Carbon Quantum Dots ◽  
Type I ◽  
Type Ii ◽  
Photodynamic Effect ◽  
Comparison Study ◽  
Top Down ◽  
Bottom Up

Visible light driven photocatalytic degradation of organic pollutants via carbon quantum dots/TiO2

2021 ◽  
Author(s):  
Kunjie Wang ◽  
lei liang ◽  
Yi Zheng ◽  
Hongxia Li ◽  
Xiaohui Niu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Hydrothermal Treatment ◽  
Organic Pollutants ◽  
Carbon Quantum Dots ◽  
Olive Leaf ◽  
Visible Light Driven

Using olive leaf as the carbon source, carbon quantum dots (CQDs) with up-conversion luminescence were prepared via reflux method. Through a hydrothermal treatment, CQDs were loaded up on the surface...

Two-dimensional transition metal carbide and nitride (MXene) derived quantum dots (QDs): synthesis, properties, applications and prospects

2020 ◽  
Vol 8 (16) ◽  
pp. 7508-7535 ◽  
Author(s):  
Binbin Shao ◽  
Zhifeng Liu ◽  
Guangming Zeng ◽  
Han Wang ◽  
Qinghua Liang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Recent Progress ◽  
Transition Metal Carbide ◽  
Two Dimensional ◽  
Metal Carbide ◽  
Future Perspectives ◽  
Synthesis Properties

Recent progress of MXene QDs, including their synthesis, properties, applications, and their future perspectives and challenges.

scholarly journals Graphene Quantum Dots as Intracellular Imaging-Based Temperature Sensors

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 616
Author(s):  
Bong Han Lee ◽  
Ryan Lee McKinney ◽  
Md. Tanvir Hasan ◽  
Anton V. Naumov
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Near Infrared ◽  
Graphene Quantum Dots ◽  
Temperature Sensing ◽  
Temperature Sensitive ◽  
Top Down ◽  
Ion Regulation ◽  
Bottom Up ◽  
Non Invasive

Non-invasive temperature sensing is necessary to analyze biological processes occurring in the human body, including cellular enzyme activity, protein expression, and ion regulation. To probe temperature-sensitive processes at the nanoscale, novel luminescence nanothermometers are developed based on graphene quantum dots (GQDs) synthesized via top-down (RGQDs) and bottom-up (N-GQDs) approaches from reduced graphene oxide and glucosamine precursors, respectively. Because of their small 3–6 nm size, non-invasive optical sensitivity to temperature change, and high biocompatibility, GQDs enable biologically safe sub-cellular resolution sensing. Both GQD types exhibit temperature-sensitive yet photostable fluorescence in the visible and near-infrared for RGQDs, utilized as a sensing mechanism in this work. Distinctive linear and reversible fluorescence quenching by up to 19.3% is observed for the visible and near-infrared GQD emission in aqueous suspension from 25 °C to 49 °C. A more pronounced trend is observed with GQD nanothermometers internalized into the cytoplasm of HeLa cells as they are tested in vitro from 25 °C to 45 °C with over 40% quenching response. Our findings suggest that the temperature-dependent fluorescence quenching of bottom-up and top-down-synthesized GQDs studied in this work can serve as non-invasive reversible/photostable deterministic mechanisms for temperature sensing in microscopic sub-cellular biological environments.

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