scholarly journals Raman Spectroscopy Investigation of Graphene Oxide Reduction by Laser Scribing

2021 ◽  
Vol 7 (2) ◽  
pp. 48
Author(s):  
Vittorio Scardaci ◽  
Giuseppe Compagnini
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Reduce Graphene Oxide ◽  
Oxide Reduction ◽  
Material Parameters ◽  
Laser Scribing ◽  
Wide Range ◽  
Scan Speed ◽  
Laser Reduction

Laser scribing has been proposed as a fast and easy tool to reduce graphene oxide (GO) for a wide range of applications. Here, we investigate laser reduction of GO under a range of processing and material parameters, such as laser scan speed, number of laser passes, and material coverage. We use Raman spectroscopy for the characterization of the obtained materials. We demonstrate that laser scan speed is the most influential parameter, as a slower scan speed yields poor GO reduction. The number of laser passes is influential where the material coverage is higher, producing a significant improvement of GO reduction on a second pass. Material coverage is the least influential parameter, as it affects GO reduction only under restricted conditions.

scholarly journals Characterization of Graphite Oxide and Reduced Graphene Oxide Obtained from Different Graphite Precursors and Oxidized by Different Methods Using Raman Spectroscopy

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1050 ◽  
Author(s):  
Roksana Muzyka ◽  
Sabina Drewniak ◽  
Tadeusz Pustelny ◽  
Maciej Chrubasik ◽  
Grażyna Gryglewicz
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphite Oxide ◽  
Reduced Graphene

Synthesis of Graphene Oxide from Alternative Sources

2016 ◽  
Vol 38 ◽  
pp. 96-100
Author(s):  
Miguel Sanchez ◽  
Mauro Cesar Terence ◽  
Juan Alfredo Guevara Carrió
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Large Scale ◽  
Two Dimensional ◽  
Hummers Method ◽  
Exothermic Process ◽  
Alternative Sources ◽  
Redox Method ◽  
Modified Hummers Method

Two-dimensional films of graphene oxide (GO) have been synthesized using various oxidation methods such as the conventional or modified Hummers method. The redox method for graphite has shown promise at producing GO films on a large scale. However, this method is a very exothermic process that liberates gases that are harmful to the environment and humans. This article addresses the characterization of graphene oxide from alternative sources of carbon and using the dry method. Comparative studies performed using Raman spectroscopy suggest that this method is both promising and more environmentally friendly.

Facile synthesis and characterization of graphene oxide/prussian blue/amino-terminated perylene derivative nanomaterials

2020 ◽  
Vol 10 (6) ◽  
pp. 922-927
Author(s):  
Deng Pan ◽  
Chang Liu ◽  
Lei Dai ◽  
Han Shen
Keyword(s):  
Raman Spectroscopy ◽  
Composite Material ◽  
Graphene Oxide ◽  
Prussian Blue ◽  
Synthesis And Characterization ◽  
Facile Synthesis ◽  
Electrochemical Technology ◽  
And Function ◽  
Scanning Electron

We report a facile and effective way to prepare graphene oxide/prussian blue/amino-terminated perylene derivative nanomaterials (GO/PB/PTCNH2). The morphology, size and function of prepared carbon-based composite material were characterized by using field emission scanning electron microscope (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, UV-vis spectrophotometer and electrochemical technology. As a result, PB nanoparticles and PTCNH2 were uniformly dispersed on a typical origami GO sheet, and GO/PB/PTCNH2 nanocomposite had good stability and electrochemical properties.

scholarly journals Graphene for the Building of Electroanalytical Enzyme-Based Biosensors. Application to the Inhibitory Detection of Emerging Pollutants

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2094 ◽  
Author(s):  
Marta Bonet-San-Emeterio ◽  
Noelia Felipe Montiel ◽  
Manel del Valle
Keyword(s):  
Graphene Oxide ◽  
Benzoic Acid ◽  
Low Cost ◽  
Reduced Graphene ◽  
Maximum Inhibition ◽  
Wide Range ◽  
Carboxylic Groups ◽  
Enzymatic Biosensor ◽  
Laccase Enzyme

Graphene and its derivates offer a wide range of possibilities in the electroanalysis field, mainly owing to their biocompatibility, low-cost, and easy tuning. This work reports the development of an enzymatic biosensor using reduced graphene oxide (RGO) as a key nanomaterial for the detection of contaminants of emerging concern (CECs). RGO was obtained from the electrochemical reduction of graphene oxide (GO), an intermediate previously synthesized in the laboratory by a wet chemistry top-down approach. The extensive characterization of this material was carried out to evaluate its proper inclusion in the biosensor arrangement. The results demonstrated the presence of GO or RGO and their correct integration on the sensor surface. The detection of CECs was carried out by modifying the graphene platform with a laccase enzyme, turning the sensor into a more selective and sensitive device. Laccase was linked covalently to RGO using the remaining carboxylic groups of the reduction step and the carbodiimide reaction. After the calibration and characterization of the biosensor versus catechol, a standard laccase substrate, EDTA and benzoic acid were detected satisfactorily as inhibiting agents of the enzyme catalysis obtaining inhibition constants for EDTA and benzoic acid of 25 and 17 mmol·L−1, respectively, and a maximum inhibition percentage of the 25% for the EDTA and 60% for the benzoic acid.

scholarly journals Synthesis, Studies and Structural characterization of Thermal and Hydrazine Reduction of Graphene Oxide by Raman Spectroscopy and Infrared Spectroscopy

2019 ◽  
Vol 11 (3) ◽  
pp. 866-877
Author(s):  
Ana Elisa Ferreira Oliveira ◽  
Arnaldo César Pereira ◽  
Guilherme Braga Bettio ◽  
César Ricardo Teixeira Tarley
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Infrared Spectroscopy ◽  
Structural Characterization ◽  
Hydrazine Reduction

scholarly journals Laser Synthesized Graphene and Its Applications

2021 ◽  
Vol 11 (14) ◽  
pp. 6304
Author(s):  
Vittorio Scardaci
Keyword(s):  
Graphene Oxide ◽  
Reduce Graphene Oxide ◽  
Research Effort ◽  
Synthesis Method ◽  
Laser Synthesis ◽  
Natural Materials ◽  
The Past ◽  
Wide Range ◽  
Laser Sources ◽  
Synthetic Routes

Since graphene was discovered, a great deal of research effort has been devoted to finding more and more effective synthetic routes, stimulated by its astounding properties and manifold promising applications. Over the past decade, laser synthesis has been proposed as a viable synthesis method to reduce graphene oxide to graphene as well as to obtain graphene from other carbonaceous sources such as polymers or other natural materials. This review first proposes to discuss the various conditions under which graphene is obtained from the reduction of graphene oxide or is induced from other materials using laser sources. After that, a wide range of applications proposed for the obtained materials are discussed. Finally, conclusions are drawn and the author’s perspectives are given.

Characterization of Graphene Oxide Suspension for Fluorescence Quenching in DNA-Diagnostics

2016 ◽  
Vol 26 (1) ◽  
pp. 1-7 ◽  
Author(s):  
A.N. Kapitonov ◽  
G.N. Alexandrov ◽  
F.D. Vasileva ◽  
S.A. Smagulova ◽  
V.B. Timofeev ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fluorescence Quenching ◽  
Dna Diagnostics

Polymer Chemistry

2004 ◽  
Keyword(s):  
Conducting Polymers ◽  
Liquid Crystalline ◽  
Polymer Chemistry ◽  
Chain Growth ◽  
Crystalline Polymers ◽  
Wide Range ◽  
Cyclic Oligomers ◽  
Step Growth

Polymer Chemistry: A Practical Approach in Chemistry has been designed for both chemists working in and new to the area of polymer synthesis. It contains detailed instructions for preparation of a wide-range of polymers by a wide variety of different techniques, and describes how this synthetic methodology can be applied to the development of new materials. It includes details of well-established techniques, e.g. chain-growth or step-growth processes together with more up-to-date examples using methods such as atom-transfer radical polymerization. Less well-known procedures are also included, e.g. electrochemical synthesis of conducting polymers and the preparation of liquid crystalline elastomers with highly ordered structures. Other topics covered include general polymerization methodology, controlled/"living" polymerization methods, the formation of cyclic oligomers during step-growth polymerization, the synthesis of conducting polymers based on heterocyclic compounds, dendrimers, the preparation of imprinted polymers and liquid crystalline polymers. The main bulk of the text is preceded by an introductory chapter detailing some of the techniques available to the scientist for the characterization of polymers, both in terms of their chemical composition and in terms of their properties as materials. The book is intended not only for the specialist in polymer chemistry, but also for the organic chemist with little experience who requires a practical introduction to the field.

scholarly journals Morpho-molecular ex vivo detection and grading of non-muscle-invasive bladder cancer using forward imaging probe based multimodal optical coherence tomography and Raman spectroscopy

The Analyst ◽  
2020 ◽  
Vol 145 (4) ◽  
pp. 1445-1456 ◽  
Author(s):  
Fabian Placzek ◽  
Eliana Cordero Bautista ◽  
Simon Kretschmer ◽  
Lara M. Wurster ◽  
Florian Knorr ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Optical Coherence Tomography ◽  
Imaging System ◽  
Ex Vivo ◽  
Large Field ◽  
Optical Coherence ◽  
Fiber Optic Probe ◽  
Optic Probe ◽  
Muscle Invasive

Characterization of bladder biopsies, using a combined fiber optic probe-based optical coherence tomography and Raman spectroscopy imaging system that allows a large field-of-view imaging and detection and grading of cancerous bladder lesions.

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