Antibacterial activities and mechanisms of fluorinated graphene and guanidine-modified graphene

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 8763-8772 ◽  
Author(s):  
Xu Wang ◽  
Peng Lu ◽  
Yuan Li ◽  
Huining Xiao ◽  
Xiangyang Liu
Keyword(s):  
Graphene Oxide ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Graphene Derivatives ◽  
Fluorinated Graphene ◽  
Modified Graphene

The antibacterial properties and mechanism of three types of graphene derivatives, graphene oxide (GO), fluorinated graphene (FG), and guanidine-modified graphene (PHGH-G), were comparatively studied.

scholarly journals Graphene Oxide Reinforced Polycarbonate Nanocomposite Films with Antibacterial Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
R. Mahendran ◽  
D. Sridharan ◽  
K. Santhakumar ◽  
T. A. Selvakumar ◽  
P. Rajasekar ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Low Cost ◽  
Thermal Studies ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Nanocomposite Films ◽  
Matrix Microstructure ◽  
Phase Inversion Technique

The incorporation of carbonaceous nanofillers into polymers can result in significant materials with improved physicochemical properties and novel composite functionalities. In this study, we have fabricated antibacterial, lightweight, transparent, and flexible graphene oxide (GO) reinforced polycarbonate thin films by a facile and low-cost methodology. Solution blending is employed to get a homogeneous mixture of PC-GO composites at various loading of GO, and the thin films are prepared by dry-wet phase inversion technique. Thermal studies and micrographs of the films revealed the incorporation of GO in PC matrix. Microstructure of the thin films showed the homogeneous dispersion of GO at micro- and nanoscales; however, at higher loading of GO (0.7%), significant agglomeration is observed. More importantly, PC-GO composite films exhibited excellent antibacterial activities against E. coli and S. aureus, owing to the antibacterial nature of GO nanoparticles.

scholarly journals Synthesis, Characterization, Photo-Luminescence and Antibacterial Activities of Silica-Graphene Oxide Composites

2021 ◽  
Author(s):  
Imad H. Khaleel ◽  
Abdulkareem A. Alkhafaji ◽  
Hussein A. Miran ◽  
Zainab N. Jaf
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Dye Adsorption ◽  
Photo Luminescence ◽  
Antibacterial Activities ◽  
Nano Particles ◽  
Glass Substrates ◽  
Nano Powder

In this research, a novel thin film Si-GO10 and nano-powders Si-GO30 of silica-graphene oxide composite were prepared via sol-gel method and deposited on glass substrates using spray pyrolysis. XRD results showed a relatively strong peak in graphite layer that corresponds to the plane of (002). TEM images displayed that SiO<sub>2</sub> nano-particles were randomly distributed on the surface of Si-GO30 sample, and the particle size in these nano-powders was below 50 nm. Moreover, silica nano-particles on the surface of GO plates exhibited almost a spherical and rod-like nanoparticles shapes, which in turn confirmed the formation of SiO<sub>2</sub>-GO nano-hybrids. FESEM analysis reveals a different morphology, the Si-GO10 sample is so rough and crumble, while the Si-GO30 sample is relatively smooth on the surface. Photocatalytic investigations revealed the composite materials exhibit high activity for dye adsorption and decomposition. Si-GO10 thin film did not undergo degradation after 120 minutes, however, for Si-GO30 nano-powder, the adsorption peak intensity was reduced to 665 nm, indicating a decrease in the dye concentration in the solution. FTIR analysis demonstrated that carboxylic functional groups are decreased by increasing silica particles. Photo-Luminescence (PL) spectrum in Si-GO10 thin film disclosed a severe emission peak at about 675 nm. This spectrum was completely disappeared in Si-GO30 nano-powders. Results of the antibacterial properties emphasized that Si-GO30 nano-particle would prevent Escherichia. coli growth after 20 hours. The presented methodology allows for the synthesis of graphene oxide supported silicon dioxide nano-particles for promising applications in photocatalytic and antibacterial fields.

The Preparation and Characterization of Fluorinated Graphene Oxide with Different Degrees of Oxidation

2018 ◽  
Vol 792 ◽  
pp. 89-97
Author(s):  
Xiao Feng Zhao ◽  
Zi Li Yu ◽  
Cong Li Fu ◽  
Xiu Li Wang
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Property ◽  
Graphene Derivatives ◽  
Ft Ir ◽  
Fluorinated Graphene ◽  
Fluorinated Graphene Oxide

For many excellent graphene derivatives, tailoring the material properties is crucial to get a broader application. In the present work, a series of fluorinated graphene oxide (FGO) with various oxidation degree were synthesized using a modified Hummers method at different reaction temperatures. The structure and property of FGO were analyzed by X-ray diffraction (XRD), Fourier transform infra-red spectra (FT-IR), X-ray photoelectron spectra (XPS) and Zeta potential analysis. The results indicate that the oxygen contents range from 5.61 % to 21.96 % in FGO can be tuned by altering the reaction temperatures. The oxygen in FGO is presented mainly in the form of epoxide and carboxyl groups. With increasing reaction temperature from 50 °C to 90 °C, the oxygen content in FGO decreases and thicker multilayered FGO is formed with lower dispersibility.

Preparation, characterization and antibacterial properties of silver-modified graphene oxide

2011 ◽  
Vol 21 (10) ◽  
pp. 3350-3352 ◽  
Author(s):  
Jizhen Ma ◽  
Jintao Zhang ◽  
Zhigang Xiong ◽  
Yu Yong ◽  
X. S. Zhao
Keyword(s):  
Graphene Oxide ◽  
Antibacterial Properties ◽  
Modified Graphene Oxide ◽  
Modified Graphene

Enhanced catalytic and antibacterial activities of silver nanoparticles immobilized on poly(N-vinyl pyrrolidone)-grafted graphene oxide

RSC Advances ◽  
2015 ◽  
Vol 5 (100) ◽  
pp. 81994-82004 ◽  
Author(s):  
Shikha Singh ◽  
Ravi Kumar Gundampati ◽  
Kheyanath Mitra ◽  
K. Ramesh ◽  
Medicherla V. Jagannadham ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Ag Nanoparticles ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Vinyl Pyrrolidone

PNVP grafted on GO regulates the size of Ag nanoparticles and enhances the catalytic and antibacterial properties along with increase in the dispersibility of GO.

scholarly journals Study on Synthesis and Antibacterial Properties of Ag NPs/GO Nanocomposites

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Lei Huang ◽  
Hongtao Yang ◽  
Yanhua Zhang ◽  
Wei Xiao
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Structure Characterization ◽  
Synthesis Process ◽  
Phase Method ◽  
Ag Nps ◽  
Selected Area Electron Diffraction ◽  
20 Nm

Using graphene oxide as substrate and stabilizer for the silver nanoparticles, silver nanoparticles-graphene oxide (Ag NPs/GO) composites with different Ag loading were synthesized through a facile solution-phase method. During the synthesis process, AgNO3on GO matrix was directly reduced by NaBH4. The structure characterization was studied through X-ray diffraction (XRD), atomic force microscopy (AFM), high-resolution transmission electron microscope (HRTEM), ultraviolet-visible spectroscopy (UV-Vis), and selected area electron diffraction (SAED). The results show that Ag nanoparticles (Ag NPs) with the sizes ranging from 5 to 20 nm are highly dispersed on the surfaces of GO sheets. The shape and size of the Ag NPs are decided by the volume of initial AgNO3solution added in the GO. The antibacterial activities of Ag NPs/GO nanocomposites were investigated and the result shows that all the produced composites exhibit good antibacterial activities against Gram-negative (G−) bacterial strainEscherichia coli(E. coli) and Gram-positive (G+) strainStaphylococcus aureus(S. aureus). Moreover, the antibacterial activities of Ag NPs/GO nanocomposites gradually increased with the increasing of volume of initial AgNO3solution added in the GO and this improvement of the antibacterial activities results from the combined action of size effect and concentration effect of Ag NPs in Ag NPs/GO nanocomposites.

scholarly journals Particle Size-Dependent Antibacterial Activity and Murine Cell Cytotoxicity Induced by Graphene Oxide Nanomaterials

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Lin Zhao ◽  
Guangxin Duan ◽  
Zaixing Yang ◽  
Jeffrey K. Weber ◽  
Xu Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Morphological Changes ◽  
Graphene Quantum Dots ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Raw 264.7 Cells ◽  
Cell Cytotoxicity ◽  
Cytotoxic Effects ◽  
Bacterial Colony ◽  
Wide Range

Recent studies have indicated that graphene and its derivative graphene oxide (GO) engage in a wide range of antibacterial activities with limited toxicity to human cells. Here, we systematically evaluate the dependence of GO toxicity on the size of the nanoparticles used in treatments: we compare the cytotoxic effects of graphene quantum dots (GQDs, <15 nm), small GOs (SGOs, 50–200 nm), and large GOs (LGOs, 0.5–3 μm). We synthesize the results of bacterial colony count assays and SEM-based observations of morphological changes to assess the antibacterial properties that these GOs bring into effect againstE. coli. We also use Live/Dead assays and morphological analysis to investigate changes to mammalian (Murine macrophage-like Raw 264.7) cells induced by the presence of the various GO particle types. Our results demonstrate that LGOs, SGOs, and GQDs possess antibacterial activities and cause mammalian cell cytotoxicity at descending levels of potency. Placing our observations in the context of previous simulation results, we suggest that both the lateral size and surface area of GO particles contribute to cytotoxic effects. We hope that the size dependence elucidated here provides a useful schematic for tuning GO-cell interactions in biomedical applications.

scholarly journals Improved heterogeneous electron transfer kinetics of fluorinated graphene derivatives

Nanoscale ◽  
2014 ◽  
Vol 6 (17) ◽  
pp. 10140-10146 ◽  
Author(s):  
Sidhureddy Boopathi ◽  
Tharangattu N. Narayanan ◽  
Shanmugam Senthil Kumar
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Fluorine Atom ◽  
Electron Transfer Kinetics ◽  
Catalytic Activities ◽  
Heterogeneous Electron Transfer ◽  
Graphene Derivatives ◽  
Fluorinated Graphene ◽  
Kinetics Of ◽  
Fluorinated Graphene Oxide

Augmented electron transfer kinetics of fluorinated graphene oxide (FGO) in comparison to graphene oxide is demonstrated. FGO and reduced FGO perform enhanced electro-catalytic activities, where the fluorine atom can modify the electronic as well as electrochemical activities of graphene surface.

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