scholarly journals Structure-controllable growth of nitrogenated graphene quantum dots via solvent catalysis for selective C-N bond activation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Byung Joon Moon ◽  
Sang Jin Kim ◽  
Aram Lee ◽  
Yelin Oh ◽  
Seoung-Ki Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Bond Activation ◽  
Theoretical Calculations ◽  
Graphene Quantum Dots ◽  
Practical Utilization ◽  
Molecular Precursors ◽  
Chemical Structures ◽  
Simultaneous Control ◽  
Solvent Molecules

AbstractPhotophysical and photochemical properties of graphene quantum dots (GQDs) strongly depend on their morphological and chemical features. However, systematic and uniform manipulation of the chemical structures of GQDs remains challenging due to the difficulty in simultaneous control of competitive reactions, i.e., growth and doping, and the complicated post-purification processes. Here, we report an efficient and scalable production of chemically tailored N-doped GQDs (NGs) with high uniformity and crystallinity via a simple one-step solvent catalytic reaction for the thermolytic self-assembly of molecular precursors. We find that the graphitization of N-containing precursors during the formation of NGs can be modulated by intermolecular interaction with solvent molecules, the mechanism of wh ich is evidenced by theoretical calculations and various spectroscopic analyses. Given with the excellent visible-light photoresponse and photocatalytic activity of NGs, it is expected that the proposed approach will promote the practical utilization of GQDs for various applications in the near future.

scholarly journals Anti-Biofilm Activity of Graphene Quantum Dots via Self-Assembly with Bacterial Amyloid Proteins

ACS Nano ◽  
2019 ◽  
Vol 13 (4) ◽  
pp. 4278-4289 ◽  
Author(s):  
Yichun Wang ◽  
Usha Kadiyala ◽  
Zhibei Qu ◽  
Paolo Elvati ◽  
Christopher Altheim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Graphene Quantum Dots ◽  
Amyloid Proteins

scholarly journals One-pot synthesis of graphene quantum dots and simultaneous nanostructured self-assembly via a novel microwave-assisted method: impact on triazine removal and efficiency monitoring

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 29939-29946 ◽  
Author(s):  
Beatriz Fresco-Cala ◽  
M. Laura Soriano ◽  
Alice Sciortino ◽  
Marco Cannas ◽  
Fabrizio Messina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Self Assembly ◽  
Graphene Quantum Dots ◽  
One Pot ◽  
Graphene Quantum Dot ◽  
Microwave Assisted ◽  
Microwave Reaction ◽  
One Step ◽  
Microwave Assisted Method

Graphene quantum dot (GQDs) assemblies from a one-step microwave reaction as bifunctional materials in remediation of triazines.

A srikaya-like light-harvesting antenna based on graphene quantum dots and porphyrin unimolecular micelles

2016 ◽  
Vol 52 (60) ◽  
pp. 9394-9397 ◽  
Author(s):  
Yannan Liu ◽  
Shanlong Li ◽  
Ke Li ◽  
Yongli Zheng ◽  
Meng Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Light Harvesting ◽  
Graphene Quantum Dots ◽  
Light Harvesting Antenna

A novel hybrid light-harvesting antenna with a srikaya-like structure of multi-graphene quantum dots (GQDs) as donors and one porphyrin unimolecular micelle as the acceptor was constructed through electrostatic self-assembly.

Graphene Quantum Dots in the Game of Directing Polymer Self-Assembly to Exotic Kagome Lattice and Janus Nanostructures

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 9397-9407 ◽  
Author(s):  
Adeeba Shakeel ◽  
Rohan Bhattacharya ◽  
Sampathkumar Jeevanandham ◽  
Dakshi Kochhar ◽  
Aarti Singh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Graphene Quantum Dots ◽  
Kagome Lattice ◽  
Kagomé Lattice

Hydrothermal synthesis of biocompatible nitrogen doped graphene quantum dots

2021 ◽  
pp. 0958305X2098411
Author(s):  
Wan Ibtisam Wan Omar ◽  
Chin Fhong Soon ◽  
Mohd Khairul Ahmad ◽  
Masaru Shimomura
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Hydrothermal Synthesis ◽  
Density Functional ◽  
Theoretical Calculations ◽  
Graphene Quantum Dots ◽  
Biological Application ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Nitrogen-doped graphene quantum dots (N-GQDs) are promising biocompatible nanomaterial which has received much attention for biological application. However, the effect of the engineered electronic structure of N-GQDs to the fluorescence of GQDs applied for bio-imaging is still under debate. In this study, N-GQDs were synthesized by a facile one-step hydrothermal method for 10 hours at 180°C and theoretical calculation of electronic structure using density functional theory (DFT) by GAUSSIAN 09, were compared. Single to multilayer of N-GQDs with the particle size of 3.2 nm in average were obtained from hydrothermal synthesis. The optical properties of N-GQDs emitted green photoluminescence (PL) at 525 nm (2.36 eV) with PL excitation (PLE) at 367 nm (3.38 eV). From DFT calculation, the optoelectronic properties of GQDs from HOMO to LUMO differ between edge functionalization and graphitic nitrogen doping. Furthermore, cells cytotoxity showed that N-GQDs possess non-toxic property, and the cells were presented with high viability. In summary, by comparing experimental and theoretical calculations, the electronic properties of N-GQDs could enhance their reactivity in photo-electronics for biological application.

Target specific aptamer-induced self-assembly of fluorescent graphene quantum dots on palladium nanoparticles for sensitive detection of tetracycline in raw milk

2021 ◽  
Vol 346 ◽  
pp. 128893
Author(s):  
Syed Rahin Ahmed ◽  
Satish Kumar ◽  
Greter A. Ortega ◽  
Seshasai Srinivasan ◽  
Amin Reza Rajabzadeh
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Palladium Nanoparticles ◽  
Graphene Quantum Dots ◽  
Raw Milk ◽  
Sensitive Detection

scholarly journals Anti-biofilm Activity of Graphene Quantum Dots via Self-Assembly with Bacterial Amyloid Proteins

2019 ◽  
Author(s):  
Yichun Wang ◽  
Usha Kadiyala ◽  
Zhibei Qu ◽  
Paolo Elvati ◽  
Christopher Altheim ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Quantum Dots ◽  
Self Assembly ◽  
Graphene Quantum Dots ◽  
Robust Stabilization ◽  
Amyloid Fibers ◽  
Matrix Production ◽  
Biofilm Dispersal ◽  
Novel Strategy ◽  
Dispersal Events

ABSTRACTBacterial biofilms represent an essential part of Earth’s ecosystem that can cause multiple ecological, technological and health problems. The environmental resilience and sophisticated organization of biofilms are enabled by the extracellular matrix that creates a protective network of biomolecules around the bacterial community. Current anti-biofilm agents can interfere with extracellular matrix production but, being based on small molecules, are degraded by bacteria and rapidly diffuse away from biofilms. Both factors severely reduce their efficacy, while their toxicity to higher organisms create additional barriers to their practicality. In this paper we report on the ability of graphene quantum dots to effectively disperse mature Staphylococcus aureus biofilms, interfering with the self-assembly of amyloid fibers - a key structural component of the extracellular matrix. Mimicking peptide-binding biomolecules, graphene quantum dots form supramolecular complexes with phenol soluble modulins, the peptide monomers of amyloid fibers. Experimental and computational results show that graphene quantum dots efficiently dock near the N-terminus of the peptide and change the secondary structure of phenol soluble modulins, which disrupts their fibrillation and represents a novel strategy for mitigation of bacterial communities. GQD mediated staphylococcal biofilm dispersal. GQDs interact with PSM peptides and frustrate the fibrillation process. The reduction in amyloid fibers prevents robust stabilization of the biofilm. In addition, there is an increase in free monomeric and oligomeric PSM peptides which trigger dispersal events.

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