The role of ozone in the ozonation process of graphene oxide: oxidation or decomposition?

RSC Advances ◽  
2014 ◽  
Vol 4 (102) ◽  
pp. 58325-58328 ◽  
Author(s):  
Feng Yang ◽  
Meilian Zhao ◽  
Zhen Wang ◽  
Hongyun Ji ◽  
Baozhan Zheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Decomposition Stage ◽  
Ozonation Time ◽  
Oxidation Stage ◽  
Ozonation Process

We took ozonation as an effective method to re-oxidize graphene oxide (GO) and discussed the behaviour of ozone in ozonation process of graphene oxide according to the changes of optical properties, compositions and structure. The results indicated that the ozonation process may involve the oxidation stage and decomposition stage. The fluorescence shifted blue with prolonging ozonation time.

Modulating Optical Properties of Graphene Oxide: Role of Prominent Functional Groups

ACS Nano ◽  
2011 ◽  
Vol 5 (9) ◽  
pp. 7640-7647 ◽  
Author(s):  
Priya Johari ◽  
Vivek B. Shenoy
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Functional Groups

scholarly journals The Role of the Oxidation and Reduction Parameters on the Properties of the Reduced Graphene Oxide

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 166
Author(s):  
Marta Sieradzka ◽  
Czesław Ślusarczyk ◽  
Włodzimierz Biniaś ◽  
Ryszard Fryczkowski
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Structural Parameters ◽  
Mixing Time ◽  
Energy Dispersive Spectrometer ◽  
Process Conditions ◽  
X Ray Scattering ◽  
Reduced Graphene ◽  
Oxidation Stage

One of the methods of obtaining reduced graphene oxide (rGO) involves the oxidation of graphite to graphene oxide, which is then exfoliated and reduced. Each of these stages has a decisive influence on the properties of the produced nanoadditive, which determines its subsequent application. The process conditions which are examined during the oxidation stage are related to: The mixing time of the reactants before oxidation, sonication of the reaction mixture, and its composition. During reduction optimization, in turn, the form of the GO sample and the method of its purification, as well as the temperature at which this process took place, are examined. At each stage, the determined structural parameters of the produced materials (GO and rGO) are related to their morphology (SEM—scanning electron microscope), oxidation state (FTIR—Fourier transform infrared spectroscopy, EDS—energy-dispersive spectrometer), structure defect (Raman spectroscopy), as well as the number of layers and crystalline structure (WAXS—wide-angle X-ray scattering). The obtained results show that the shorter mixing time of the reactants determines the formation of more oxygen functional groups. On the basis of the obtained results, the process conditions that enable the production of multilayer, well-exfoliated reduced graphene oxide, with only a slightly defected structure, are established.

scholarly journals The role of sp2/sp3 hybrid carbon regulation in the nonlinear optical properties of graphene oxide materials

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53643-53652 ◽  
Author(s):  
Shuai Wang ◽  
Yongli Dong ◽  
Chunying He ◽  
Yachen Gao ◽  
Nan Jia ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Nonlinear Optical ◽  
Cluster Structure ◽  
Nonlinear Optical Properties ◽  
Oxide Materials ◽  
Carbon Regulation ◽  
Reduced Graphene ◽  
Hybrid Carbon

A reduced graphene oxide with regulatable sp2 hybrid carbon configuration/cluster structure presents significant nonlinear optical properties.

scholarly journals Role of the Anilinium Ion on the Selective Polymerization of Anilinium 2-Acrylamide-2-methyl-1-propanesulfonate

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2349
Author(s):  
Alain Salvador Conejo-Dávila ◽  
Marco Armando Moya-Quevedo ◽  
David Chávez-Flores ◽  
Alejandro Vega-Rios ◽  
Erasto Armando Zaragoza-Contreras
Keyword(s):  
Cyclic Voltammetry ◽  
Optical Properties ◽  
Thermal Properties ◽  
Free Radical ◽  
1H Nmr ◽  
Molecular Interactions ◽  
13C Nmr ◽  
Oxidative Polymerization ◽  
Cyclic Voltammetry Analysis

The development of anilinium 2-acrylamide-2-methyl-1-propanesulfonate (Ani-AMPS) monomer, confirmed by 1H NMR, 13C NMR, and FTIR, is systematically studied. Ani-AMPS contains two polymerizable functional groups, so it was submitted to selective polymerization either by free-radical or oxidative polymerization. Therefore, poly(anilinium 2-acrylamide-2-methyl-1-propanesulfonic) [Poly(Ani-AMPS)] and polyaniline doped with 2-acrylamide-2-methyl-1-propanesulfonic acid [PAni-AMPS] can be obtained. First, the acrylamide polymer, poly(Ani-AMPS), favored the π-stacking of the anilinium group produced by the inter- and intra-molecular interactions and was studied utilizing 1H NMR, 13C NMR, FTIR, and UV-Vis-NIR. Furthermore, poly(Ani-AMPS) fluorescence shows quenching in the presence of Fe2+ and Fe3+ in the emission spectrum at 347 nm. In contrast, the typical behavior of polyaniline is observed in the cyclic voltammetry analysis for PAni-AMPS. The optical properties also show a significant change at pH 4.4. The PAni-AMPS structure was corroborated through FTIR, while the thermal properties and morphology were analyzed utilizing TGA, DSC (except PAni-AMPS), and FESEM.

scholarly journals Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 7961-7971
Author(s):  
N. D. Vinh ◽  
P. M. Tan ◽  
P. V. Do ◽  
S. Bharti ◽  
V. X. Hoa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Dopant Concentration ◽  
Core Shell ◽  
Cds Quantum Dots ◽  
Cds Qds

The role of samarium (Sm) dopant on the structural, morphological, and optical properties of CdS QDs and CdS/ZnS core/shell QDs was methodically reported.

Role of non-magnetic dopants on the room temperature ferromagnetism and optical properties of BaSnO3 perovskite

2020 ◽  
Vol 281 ◽  
pp. 121028 ◽  
Author(s):  
Saad Mabrouk Yakout ◽  
Hanan A. Mousa ◽  
Hala T. Handal ◽  
Walid Sharmoukh
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism
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