scholarly journals Green syntheses of silver nanoparticle decorated reduced graphene oxide using l-methionine as a reducing and stabilizing agent for enhanced catalytic hydrogenation of 4-nitrophenol and antibacterial activity

RSC Advances ◽  
2019 ◽  
Vol 9 (67) ◽  
pp. 39264-39271 ◽  
Author(s):  
Neway Belachew ◽  
Desta Shumuye Meshesha ◽  
Keloth Basavaiah
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Silver Nanoparticle ◽  
Self Assembly ◽  
Stabilizing Agent ◽  
Assembly Method ◽  
Reduced Graphene ◽  
Synthesis Approach

Herein, we have reported a facile and green synthesis approach of Ag NP decorated reduced graphene oxide (RGO) through an in situ self-assembly method in the presence of l-methionine (l-Met) as reducing and stabilizing agent.

Facile one pot microbe-mediated in situ synthesis and antibacterial activity of reduced graphene oxide-silver nanocomposite

2021 ◽  
Author(s):  
Ashwini Patil
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Zeta Potential ◽  
Reduced Graphene Oxide ◽  
In Vitro Dissolution ◽  
Size Analysis ◽  
X Ray ◽  
Reduced Graphene

Abstract The present research deals with the development of a novel bioinspired in situ fabrication of reduced graphene oxide (rGO)-silver nanoparticle (AgNPs) nanocomposite (rGO@AgNCs) using microbes namely Pseudomonas aeruginosa (PA) and Staphylococcus aureus (SA). The fabricated rGO@AgNCs were characterized using Ultraviolet-visible (UV) spectroscopy, Fourier-transform infrared spectroscopy (FTIR), particle size analysis, polydispersity index (PDI), zeta potential analysis, energy dispersive X-ray analysis (EDAX), Raman spectroscopy, powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HR-TEM) analysis, etc. Furthermore, the rGO@AgNCs-PA and rGO@AgNCs-SA interaction with serum protein, pH stability study, and in vitro dissolution of AgNPs were also performed. The research findings of the proposed study demonstrated the simultaneous reduction of graphene oxide (GO) and AgNPs and the formation of rGO@AgNCs in the presence of microbes. The in vitro dissolution studies of rGO@AgNCs composites showed better AgNPs dissolution with controlled release and offered remarkable matrix integrity throughout the dissolution period. The size and stability of rGO@AgNCs-PA and rGO@AgNCs-SA had no significant changes at physiological pH 7.4. A minimal decrease in the zeta potential of rGO@AgNCs was observed, which may be due to the weak interaction of nanocomposites and albumin. The antibacterial application of the synthesized nanocomposite was evaluated against a pathogenic mastitis-forming bacterium. The obtained results suggested an admirable antibacterial activity of synthesized nanocomposites against the tested microbes. This knowledge will assist the scientific fraternity in designing novel antibacterial agents with enhanced antibacterial activity against various veterinary pathogens in near future.

A wearable and highly sensitive strain sensor based on a polyethylenimine–rGO layered nanocomposite thin film

2017 ◽  
Vol 5 (31) ◽  
pp. 7746-7752 ◽  
Author(s):  
Xueliang Ye ◽  
Zhen Yuan ◽  
Huiling Tai ◽  
Weizhi Li ◽  
Xiaosong Du ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Strain Sensor ◽  
Layer By Layer ◽  
Nanocomposite Thin Film ◽  
Assembly Method ◽  
Reduced Graphene ◽  
Highly Sensitive

A novel strain sensor based on reduced graphene oxide with ultra-sensitive and ultra-durable performance was fabricated by the chemical layer-by-layer self-assembly method.

scholarly journals Microwave Irradiation Synthesis and Characterization of Reduced-(Graphene Oxide-(Polystyrene-Polymethyl Methacrylate))/Silver Nanoparticle Nanocomposites and Their Anti-Microbial Activity

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1155 ◽  
Author(s):  
Mohammad A. Aldosari ◽  
Khaled Bin Bandar Alsaud ◽  
Ali Othman ◽  
Mohammed Al-Hindawi ◽  
Nadimul Haque Faisal ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Inhibition Zone ◽  
Bulk Polymerization ◽  
Reduced Graphene ◽  
Methacrylate Copolymer ◽  
K 12

Herein, we report a facile process for the preparation of styrene and methyl-methacrylate copolymer nanocomposites containing reduced graphene oxide and silver nanoparticles ((R-(GO-(PS-PMMA))/AgNPs)) by using (i) microwave irradiation (MWI) to obtain R-(GO-(PS-PMMA))/AgNPs and (ii) the in situ bulk polymerization technique to produce RGO/AgNPs-(PS-PMMA). Various characterization techniques, including FT-IR, XPS, Raman spectroscopy, XRD, SEM, HR-TEM, DSC, and TGA analysis, were used to characterize the prepared nanocomposites. The Berkovich nanoindentation method was employed to determine the hardness and elastic modulus of the nanocomposites. The results showed that the MWI-produced nanocomposites were found to have enhanced morphological, structural, and thermal properties compared with those of the nanocomposites prepared by the in situ method. In addition, the antibacterial activity of the prepared nanocomposites against the E. coli HB 101 K-12 was investigated, whereby an inhibition zone of 3 mm (RGO/AgNPs-(PS-PMMA) and 27 mm (R-(GO-(PS-PMMA))/AgNPs) was achieved. This indicates that the MWI-prepared nanocomposite has stronger antibacterial activity than the in situ-prepared nanocomposite.

scholarly journals Improving the Wear Life of a-C:H Film in High Vacuum by Self-Assembled Reduced Graphene Oxide Layers

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1733 ◽  
Author(s):  
Hui Song ◽  
Gang Chen ◽  
Jie Chen ◽  
Hongxuan Li ◽  
Li Ji ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
High Vacuum ◽  
Carbon Film ◽  
Friction Reduction ◽  
Friction Behavior ◽  
Assembly Method ◽  
Reduced Graphene ◽  
Self Assembled

As an energy-efficient surface modification method, self-assembly has been the subject of extensive research. However, its application on carbon film has been rarely reported. In the present work, a novel self-assembled reduced graphene oxide (RGO) was prepared on a-C:H film by a controllable self-assembly method, and the friction behavior of the RGO/a-C:H film was investigated under vacuum environment. Interestingly, the RGO/a-C:H film exhibited significant improvement of anti-wear ability in vacuum conditions under a high applied load of 5 N. As expected, the synergy lubrication effect of the RGO layer and a-C:H film should account for the excellent friction reduction and anti-wear ability of a RGO/a-C:H multilayer film.

In situ preparation of reduced graphene oxide reinforced acrylic rubber by self-assembly

2018 ◽  
Vol 136 (11) ◽  
pp. 47187 ◽  
Author(s):  
Jing Wang ◽  
Hongqiang Li ◽  
Lin Zhang ◽  
Xuejun Lai ◽  
Wenjian Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
In Situ Preparation ◽  
Reduced Graphene

The assembly and photoelectronic property of reduced graphene oxide/porphyrin/phthalocyanine composite films

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 42063-42068 ◽  
Author(s):  
Meijuan Zhang ◽  
Bing Yuan ◽  
Shi-zhao Kang ◽  
Lixia Qin ◽  
Guodong Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Composite Films ◽  
Layer By Layer ◽  
Assembly Method ◽  
Reduced Graphene ◽  
Porphyrin Phthalocyanine

By a layer-by-layer self-assembly method, reduced graphene oxide-based composite films with high photoelectronic activity were assembled with 5,10,15,20-tetrakis(p-N,N,N-trimethylanilinium)porphyrin and copper sulfophthalocyanine as the co-sensitizers.

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