scholarly journals Role of C–N Configurations in the Photoluminescence of Graphene Quantum Dots Synthesized by a Hydrothermal Route

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Fitri Aulia Permatasari ◽  
Akfiny Hasdi Aimon ◽  
Ferry Iskandar ◽  
Takashi Ogi ◽  
Kikuo Okuyama
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route

Hydrothermal route to graphene quantum dots: Effects of precursor and temperature

2017 ◽  
Vol 79 ◽  
pp. 112-118 ◽  
Author(s):  
Jian-De Xie ◽  
Gui-Wen Lai ◽  
Mohammad Mahmudul Huq
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route

scholarly journals Graphene hybrid materials? The role of graphene materials in the final structure of hydrogels

Nanoscale ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 4822-4830 ◽  
Author(s):  
Cristina Martín ◽  
Ana Martín-Pacheco ◽  
Alicia Naranjo ◽  
Alejandro Criado ◽  
Sonia Merino ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Hybrid Materials ◽  
Graphene Quantum Dots ◽  
Three Dimensional ◽  
Final Structure ◽  
Polymeric Network

Graphene (G), graphene oxide (GO) and graphene quantum dots (GQDs) have been introduced into a three-dimensional polymeric network based on polyacrylamide in order to ascertain the role of each nanomaterial in hydrogels.

scholarly journals The Synergistic Effect of Pyridinic Nitrogen and Graphitic Nitrogen of Nitrogen-Doped Graphene Quantum Dots for Enhanced TiO2 Nanocomposites’ Photocatalytic Performance

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 438 ◽  
Author(s):  
Fei Li ◽  
Ming Li ◽  
Yi Luo ◽  
Ming Li ◽  
Xinyu Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route ◽  
Ammonia Water ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N

In this study, nitrogen-doped graphene quantum dots (N-GQDs) and a TiO2 nanocomposite were synthesized using a simple hydrothermal route. Ammonia water was used as a nitrogen source to prepare the N-GQDs. When optically characterized by UV-vis, N-GQDs reveal stronger absorption peaks in the range of ultraviolet (UV) light than graphene quantum dots (GQDs). In comparison with GQDs/TiO2 and pure TiO2, the N-GQDs/TiO2 have significantly improved photocatalytic performance. In particular, it was found that, when the added amount of ammonia water was 50 mL, the content of pyridinic N and graphitic N were as high as 22.47% and 31.44%, respectively. Most important, the photocatalytic activity of N-GQDs/TiO2-50 was about 95% after 12 min. The results illustrated that pyridinic N and graphitic N play a significant role in photocatalytic performance.

Sustainable synthesis of single crystalline sulphur-doped graphene quantum dots for bioimaging and beyond

2018 ◽  
Vol 20 (18) ◽  
pp. 4245-4259 ◽  
Author(s):  
Sujata Sangam ◽  
Apoorv Gupta ◽  
Adeeba Shakeel ◽  
Rohan Bhattacharya ◽  
Arun Kumar Sharma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route ◽  
Single Crystalline ◽  
Doped Graphene

Waste-driven single crystalline sulphur-doped GQDs are synthesized via a green hydrothermal route with the highest quantum yield and excellent biocompatibility for bioimaging.

Role of precursor microstructure in the development of graphene quantum dots from biomass

2021 ◽  
pp. 106154
Author(s):  
Aumber Abbas ◽  
Saleem Abbas ◽  
Tanveer A Tabish ◽  
Steve J Bull ◽  
Anh N Phan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots

The role of electrostatic potential polarization in the translocation of graphene quantum dots across membranes

Nanoscale ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 2732-2739
Author(s):  
Xiaofeng Tang ◽  
Shitong Zhang ◽  
Hong Zhou ◽  
Bo Zhou ◽  
Shengtang Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electrostatic Potential ◽  
Graphene Quantum Dots ◽  
Simulation System ◽  
Water Interface ◽  
Inner Membrane ◽  
Membrane Region

With GQDs changed from non-polarized to highly polarized, the favorable location of GQDs in the simulation system translocated from the inner membrane region to the membrane–water interface.

scholarly journals Applications of Graphene Quantum Dots in Biomedical Sensors

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1072 ◽  
Author(s):  
Bhargav D. Mansuriya ◽  
Zeynep Altintas
Keyword(s):  
Quantum Dots ◽  
Water Solubility ◽  
Graphene Quantum Dots ◽  
Biomedical Sensors ◽  
Sensor Performance ◽  
Ultralow Concentrations ◽  
Wide Range ◽  
Methods Of Synthesis ◽  
Photo Stability

Due to the proliferative cancer rates, cardiovascular diseases, neurodegenerative disorders, autoimmune diseases and a plethora of infections across the globe, it is essential to introduce strategies that can rapidly and specifically detect the ultralow concentrations of relevant biomarkers, pathogens, toxins and pharmaceuticals in biological matrices. Considering these pathophysiologies, various research works have become necessary to fabricate biosensors for their early diagnosis and treatment, using nanomaterials like quantum dots (QDs). These nanomaterials effectively ameliorate the sensor performance with respect to their reproducibility, selectivity as well as sensitivity. In particular, graphene quantum dots (GQDs), which are ideally graphene fragments of nanometer size, constitute discrete features such as acting as attractive fluorophores and excellent electro-catalysts owing to their photo-stability, water-solubility, biocompatibility, non-toxicity and lucrativeness that make them favorable candidates for a wide range of novel biomedical applications. Herein, we reviewed about 300 biomedical studies reported over the last five years which entail the state of art as well as some pioneering ideas with respect to the prominent role of GQDs, especially in the development of optical, electrochemical and photoelectrochemical biosensors. Additionally, we outline the ideal properties of GQDs, their eclectic methods of synthesis, and the general principle behind several biosensing techniques.

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