Preparation of graphene nanocomposites from aqueous silver nitrate using graphene oxide’s peroxidase-like and carbocatalytic properties

Garg, Kunal; Papponen, Petri; Johansson, Andreas; Puttaraksa, Nitipon; Gilbert, Leona

doi:10.1038/s41598-020-61929-9

Cited by 19 publications

(10 citation statements)

References 50 publications

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“…Certainly, pH is what matters here since the typical surface plasmon resonance peak emerge at higher pH [34]. Indeed, it was reported that silver clusters/nanoparticles synthesized on GO surface do not necessarily exhibit the distinguishable absorbance peak, instead AgNP is displayed as the higher "background" of the absorbance spectrum [50]. Lower diameter of spherical nanoparticles also decreases the absorption cross-section [51] and, last but not least, net amount of AgNPs in the bulk GO_Ag nanomaterial is quite low.…”

Section: Spectroscopic and Microscopic Characterizationmentioning

confidence: 99%

Simplified synthesis of silver nanoparticles on graphene oxide and their applications in electrocatalysis

Filip

Wechsler²,

Šťastný³

et al. 2020

Nanotechnology

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In this work the possibility was investigated to synthesize in-situ silver nanoparticles (AgNP) on graphene oxide (GO) surface without commonly used additional reducing or alkalizing agents or increased temperature. Using diverse microscopic (AFM, TEM) and spectroscopic methods, it was proved that very small AgNPs were formed on GO by simple incubation for 2 hours a mixture of GO dispersion and AgNO3. The prepared nanomaterial (GO_Ag) was also assessed using electrochemical methods and it exhibited electrochemical behavior similar to GO_Ag nanomaterial prepared with a help of citric acid as a reducing agent. Furthermore, it was found that i) electrochemical reduction of the GO_Ag on electrode surface decreased the voltammetric response even though this step has increased the surface conductivity and ii) GO_Ag can be employed for sensing of chlorides with detection limit of 79 M and a linear range up to 10 mM. It could also provide electrochemical response toward chloroacetanilide herbicide metazachlor. Hence, the reducing capabilities of GO were proved to be applicable for insitu synthesis of metal nanoparticles with the highest possible simplification and the as-prepared nanomaterials could be employed for fabrication of different electrochemical sensors.

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Section: Spectroscopic and Microscopic Characterizationmentioning

confidence: 99%

Simplified synthesis of silver nanoparticles on graphene oxide and their applications in electrocatalysis

Filip

Wechsler²,

Šťastný³

et al. 2020

Nanotechnology

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“…The high reinforcing properties of graphene are due to the two-dimensional structure with high specific surface area of 2630 m 2 g −1 26 . Graphene, having good biological properties, has been extensively studied in biological applications, including drug delivery 27 , biosensing 28 , tissue engineering 29 , and bioimaging 30 .…”

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confidence: 99%

Improving the mechanical behavior of reduced graphene oxide/hydroxyapatite nanocomposites using gas injection into powders synthesis autoclave

Nosrati

Sarraf-Mamoory

et al. 2020

Sci Rep

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in this study, we show the synthesis of reduced graphene oxide/hydroxyapatite (rGo/HA) composites using a hydrothermal autoclave with argon-15% hydrogen gas injection. This both increases the hydrothermal pressure and uses hydrogen as a reductive agent in the process. The synthesized powders were then consolidated with spark plasma sintering method. The analysis of the consolidated samples included Vickers Indentation technique and cell viability. The results showed that injected gases in the autoclave produced powders with a higher crystallinity compared to synthesis without the gases. Also, hydrogen gas led to increased reduction of GO. The microscopic analysis confirmed existing graphene sheets with folding and wrinkling in the powders and indicated that various preferential directions played a role in the growth of hydroxyapatite crystals. The results showed that in general, graphene sheets increased the mechanical properties of HA. In the samples synthesized with injected gases, this increase was more significant. Interface analysis results indicate that reduced graphene oxide (rGO)/HA interface is likely coherent. These nanocomposites were biocompatible and showed some hydrophobicity compared to pure HA.

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“…GO is a single-atom layered material composed of carbon, hydrogen and oxygen molecules through the oxidation of inexpensive and abundant graphite crystals [ 30 , 44 , 45 ]. Furthermore, GO has good biological properties and has been widely used in biomedical field, including drug delivery [ 46 ], cancer therapy [ 47 , 48 ], biosensing [ 49 ], tissue engineering [ 50 ], and bioimaging [ 51 ]. The use of GO can enhance cell proliferation and differentiation characteristics.…”

Section: Discussionmentioning

confidence: 99%

Electrophoresis-Aided Biomimetic Mineralization System Using Graphene Oxide for Regeneration of Hydroxyapatite on Dentin

et al. 2021

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Graphene oxide (GO) is an emerging luminescent carbon nanomaterial with the ability to foster hydroxyapatite (HA). A specially designed electrophoresis system can be used to accelerate the mineralization process. The aim of this study was to promote HA crystal growth on demineralized dentin using a GO incorporated electrophoresis system. GO was successfully synthesized by carbonization of citric acid and its presence was confirmed by Fourier transform infrared and UV-visible spectrophotometry evaluation. Dentin slices were placed in demineralized solution and divided into control (without the electrophoresis system) and experimental group. Demineralized dentin slices in the experimental group were remineralized using the electrophoresis system for 8 h/1.0 mA, with one subgroup treated without GO and the other with GO. Energy dispersive spectroscopy evaluation showed that the calcium/phosphate ratio of the crystal formed in control and experimental group with addition of GO was close to natural hydroxyapatite. However, scanning electron microscopy evaluation showed that the exposed dentinal tubules were occluded with rod-like crystals, which is similar to native enamel morphology, in the experimental group with addition of GO compared to the flake-like crystal in the control group. Mechanical evaluation revealed that the nanohardness and modulus of remineralized dentin were significantly higher in the experimental group. In conclusion, GO is a promising material to remineralize dentin and the introduction of an electrophoresis system can accelerate its process.

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Preparation of graphene nanocomposites from aqueous silver nitrate using graphene oxide’s peroxidase-like and carbocatalytic properties

Cited by 19 publications

References 50 publications

Simplified synthesis of silver nanoparticles on graphene oxide and their applications in electrocatalysis

Simplified synthesis of silver nanoparticles on graphene oxide and their applications in electrocatalysis

Improving the mechanical behavior of reduced graphene oxide/hydroxyapatite nanocomposites using gas injection into powders synthesis autoclave

Electrophoresis-Aided Biomimetic Mineralization System Using Graphene Oxide for Regeneration of Hydroxyapatite on Dentin

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