Two-step synthesis of Ag@GQD hybrid with enhanced photothermal effect and catalytic performance

Wu, Cong; Yuan, Yali; He, Qian; Song, Rui

doi:10.1088/0957-4484/27/48/48lt02

Cited by 17 publications

(5 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the molecular simulations were performed using Cambridge Serial Total Energy Package module in Material Studio software of Dassault Systems (previously Accelrys Inc.) [48,49]. The module utilizes DFT based on Local Density Approximation in combination with CA-PZ exchange correlation function given by Ceperley and Alder and further parametrized by Perdew and Zunger [50,51]. S-GQDs and GQDs models were constructed and further used to build crystal with lattice parameters a=b=c=10 nm and α=β=γ=90°(having space group 1 P1).…”

Section: Computational Methodologymentioning

confidence: 99%

“…The S-GQDs synthesized under optimal condition exhibited high aqueous solubility and blue colored fluorescence under UV lamp of wavelength (365 nm). The UV-Vis absorption spectrum of S-GQDs in aqueous solution (3.35 mg ml −1 ) shows absorption band at 360 nm due to n-π * electronic transitions from present C=O groups [42,51]. The presence of n band between π and π * bands is possibly due to the defects generated in original structure of GQDs or oxygen related functional groups present on edge of sheet.…”

Section: Uv-visible Spectroscopymentioning

confidence: 98%

See 1 more Smart Citation

Effect of sulfur doping on fluorescence and quantum yield of graphene quantum dots: an experimental and theoretical investigation

et al. 2019

View full text Add to dashboard Cite

Graphene quantum dots (GQDs) are one of the most promising luminescent carbon derived nanomaterials decorated with multiple useful functional groups and remarkable optoelectronic properties. Heteroatom doping of hexagonal carbon sheet of GQDs is an effective strategy to tailor their properties to meet desired application. In this work, sulfur doped GQDs (S-GQDs) were synthesized by simply pyrolyzing citric acid (CA) as a source of carbon and 3-Mercaptopropionic acid as a source of sulfur dopant. The optimal reaction conditions (ratio of the carbon to dopant source, temperature and time of reaction) were obtained while investigating their effect on the quantum yield and fluorescence properties of GQDs and, are hereby, reported for the first time. The as-synthesized S-GQDs were extensively characterized by different analytical techniques such as transmission electron microscopy (TEM), UV-vis Spectroscopy (UV), Fourier transform infrared spectroscopy, photoluminescence (PL) and x-ray Photoelectron Spectroscopy. S-GQDs were found uniform in size (∼4 nm) and spherical in shape with strong blue fluorescence. Further, for in-depth analysis of experimental results and underlying phenomena, theoretical studies based on density functional theory were performed for chemical structure optimization, possible sites of doping and density of states calculation. The synthesized S-GQDs exhibited excellent solubility in water, a stronger fluorescence and desirably higher quantum yield (57.44%) as compared to that of previously reported undoped GQDs. These successfully demonstrated unique and improved properties of S-GQDs present them as a potential candidate for biomedical, optical, electrical and chemical applications.

show abstract

Section: Computational Methodologymentioning

confidence: 99%

Section: Uv-visible Spectroscopymentioning

confidence: 98%

Effect of sulfur doping on fluorescence and quantum yield of graphene quantum dots: an experimental and theoretical investigation

et al. 2019

View full text Add to dashboard Cite

show abstract

“…3b ). 30 The binding energy split of the 3d doublet was about 6 eV, indicating that the composite retains the metallic nature of AgNPs. 31 One peak was found at 163.9 eV in the S 2p spectrum ( Fig.…”

Section: Resultsmentioning

confidence: 96%

Silver nanoparticle@carbon quantum dot composite as an antibacterial agent

Pang

Mai

et al. 2022

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…In fact, the diverse chemistry of carboxylic acid groups has led to significant interest in carboxylated graphene nanomaterials in recent years ,,. Consequently, the COOH groups of GO have been exploited in many chemical functionalization procedures to prepare a multitude of composite materials and to use chemically‐modified GO in devices ,,–. In this sense, DC‐GO provides a unique opportunity for future work in this area due to its high content of carboxylic acid groups and the cheap graphite starting material.…”

Section: Discussionmentioning

confidence: 99%

Detailed Investigation into the Preparation of Graphene Oxide by Dichromate Oxidation

Rosillo‐Lopez

Salzmann

2018

ChemistrySelect

View full text Add to dashboard Cite

Graphene oxide (GO) can be prepared using numerous protocols including the well‐known Hummers method that relies on potassium permanganate as the oxidizing agent. Given the widespread use of GO and its many applications, a better understanding of the mechanisms of chemical oxidation is highly desirable including research into alternative oxidizing agents. Limited work has so far been carried out into using potassium dichromate as an oxidizing agent and the chemical structure of GO prepared by dichromate oxidation remains unclear. Here we present a full structural characterization of GO prepared by dichromate oxidation and we investigate its thermal stability. Furthermore, the previously reported preparation protocol is optimized by reducing the reaction time from 5 days to 20 hours and showing that sodium nitrate is not needed in the reaction mixture. Contrary to previous reports, we show that the GO material produced by dichromate oxidation is highly oxidized if thermal annealing is avoided. Compared to traditional GO, larger amounts of carboxylic acid groups are found which constitutes a major advantage for chemical processing and applications in materials chemistry.

show abstract

Two-step synthesis of Ag@GQD hybrid with enhanced photothermal effect and catalytic performance

Cited by 17 publications

References 40 publications

Effect of sulfur doping on fluorescence and quantum yield of graphene quantum dots: an experimental and theoretical investigation

Effect of sulfur doping on fluorescence and quantum yield of graphene quantum dots: an experimental and theoretical investigation

Silver nanoparticle@carbon quantum dot composite as an antibacterial agent

Detailed Investigation into the Preparation of Graphene Oxide by Dichromate Oxidation

Contact Info

Product

Resources

About