Functional group dependence of spin magnetism in graphene oxide

Polyhedron ◽  
2017 ◽  
Vol 136 ◽  
pp. 155-158 ◽  
Author(s):  
Kentaro Tajima ◽  
Takuya Isaka ◽  
Tomoki Yamashina ◽  
Yutaka Ohta ◽  
Yoshiaki Matsuo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Group ◽  
Spin Magnetism

scholarly journals X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 478
Author(s):  
Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽  
Yap Wing Fen ◽  
Silvan Saleviter ◽  
Narong Chanlek ◽  
Hideki Nakajima ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Functional Group ◽  
Optical Sensing ◽  
Composite Thin Films ◽  
Cobalt Ions ◽  
X Ray ◽  
Sensing Applications

In this study, X-ray photoelectron spectroscopy (XPS) was used to study chitosan–graphene oxide (chitosan–GO) incorporated with 4-(2-pyridylazo)resorcinol (PAR) and cadmium sulfide quantum dot (CdS QD) composite thin films for the potential optical sensing of cobalt ions (Co2+). From the XPS results, it was confirmed that carbon, oxygen, and nitrogen elements existed on the PAR–chitosan–GO thin film, while for CdS QD–chitosan–GO, the existence of carbon, oxygen, cadmium, nitrogen, and sulfur were confirmed. Further deconvolution of each element using the Gaussian–Lorentzian curve fitting program revealed the sub-peak component of each element and hence the corresponding functional group was identified. Next, investigation using surface plasmon resonance (SPR) optical sensor proved that both chitosan–GO-based thin films were able to detect Co2+ as low as 0.01 ppm for both composite thin films, while the PAR had the higher binding affinity. The interaction of the Co2+ with the thin films was characterized again using XPS to confirm the functional group involved during the reaction. The XPS results proved that primary amino in the PAR–chitosan–GO thin film contributed more important role for the reaction with Co2+, as in agreement with the SPR results.

Synthesis of Oxygen Functional Group-Controlled Monolayer Graphene Oxide

2021 ◽  
Vol 94 (9) ◽  
pp. 2195-2201
Author(s):  
Tatsuki Tsugawa ◽  
Kazuto Hatakeyama ◽  
Junko Matsuda ◽  
Michio Koinuma ◽  
Shintaro Ida
Keyword(s):  
Graphene Oxide ◽  
Functional Group ◽  
Monolayer Graphene ◽  
Oxygen Functional Group

scholarly journals Fabrication of Graphene Oxide/Zinc Oxide Hybrid Nanocomposite and Assessment on Structural, Thermal and Optical Characterizations

2020 ◽  
Vol 32 (4) ◽  
pp. 881-886
Author(s):  
Sanoop Padinhattayil ◽  
K. Sheshappa Rai
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Crystal Size ◽  
Functional Group ◽  
Group Identification ◽  
Thermogravimetric Analyzer ◽  
Research Activities ◽  
Structural Nature ◽  
Oxide Nanoparticle ◽  
Thermal Stability Of

The present work provides a selective review of research activities that focus on the graphene oxide (GO) and zinc oxide (ZnO) hybrid nanomaterials and their physical characterizations. The graphene oxide nanoparticle was prepared by modified Hummer’s method and the nanohybrids of GO/ZnO prepared by chemical method. Nanohybrids were characterized by thermogravimetric analyzer to find the thermal stability of the hybrid material, the structural nature and crystal size by P-XRD, functional group identification and surface morphology by using FTIR & SEM technique. This method provides a facile method to synthesize the nanohybrid and will be freely extended to do the research on other class of hybrids based of graphene oxide.

scholarly journals Synthesis and Characterisations of Reduced Graphene Oxide Prepared by Microwave Irradiation with Sonication

2021 ◽  
Vol 32 (2) ◽  
pp. 1-13
Author(s):  
Fika Fauzi ◽  
Fayyad Azizi ◽  
Muhammad Miqdam Musawwa ◽  
Wipsar Sunu Brams Dwandaru
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Mass Production ◽  
Functional Group ◽  
Scale Up ◽  
Synthesis Method ◽  
Oxygen Functional Group ◽  
Reduced Graphene ◽  
Uv Visible ◽  
Sonication Technique

Recently, reducing graphene oxide (GO) through microwave irradiation has been extensively explored in order to scale up the mass production of graphene. We report the simple technique to reduce GO by means of microwave irradiation combined with a sonication technique. The microwave-reduced GO (MWrGO) is formed by exposing a microwave onto GO powder in order to reduce the oxygen functional group and then followed by exfoliating via a sonication method. The time exposure of the microwave irradiation was 20 min with the powers of 450 W and 800 W. The UV-visible (UV-vis) spectra showed the evolution of GO into MWrGO indicated by the red shift of the absorption peak from 230 nm to 267 nm and disappearance of the shouldering peak at 300 nm. The reduction of the oxygen functional group has been proved by Fourier transform infrared (FTIR) spectra. Furthermore, the scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) data demonstrated further confirmation of the reduction of GO and the formation of basal planes of sp2 carbon clusters of the sample due to the treatment. The EDS spectra revealed that the MWrGO by 800-W-irradiation had much less oxygen functional groups and much more carbon content than GO. The proposed synthesis method is simple and readily controlled for a mass production of graphene from GO.

Functional group engineering of Graphene Oxide

TANSO ◽  
2015 ◽  
Vol 2015 (266) ◽  
pp. 31-34
Author(s):  
Yasumichi Matsumoto ◽  
Michio Koinuma ◽  
Takaaki Taniguchi
Keyword(s):  
Graphene Oxide ◽  
Functional Group

Synthesis of amidoximated graphene oxide nanoribbons from unzipping of multiwalled carbon nanotubes for selective separation of uranium(vi)

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 89309-89318 ◽  
Author(s):  
Yun Wang ◽  
Zhengshang Wang ◽  
Ran Ang ◽  
Jijun Yang ◽  
Ning Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Functional Group ◽  
Selective Separation ◽  
Solid Matrix ◽  
Multiwalled Carbon ◽  
Selective Sorbent ◽  
Graphene Oxide Nanoribbons

A kind of uranium-selective sorbent has been studied using graphene oxide nanoribbons (GONRs) from the unzipping of multiwalled carbon nanotubes as a solid matrix and amidoxime (AO) as a functional group.

Epoxide Speciation and Functional Group Distribution in Graphene Oxide Paper-Like Materials

2012 ◽  
Vol 22 (18) ◽  
pp. 3950-3957 ◽  
Author(s):  
Adrian Hunt ◽  
Dmitriy A. Dikin ◽  
Ernst Z. Kurmaev ◽  
Teak D. Boyko ◽  
Paul Bazylewski ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Group ◽  
Graphene Oxide Paper ◽  
Group Distribution

scholarly journals Effects of Oxygenated Acids on Graphene Oxide: The Source of Oxygen-Containing Functional Group

2021 ◽  
Vol 9 ◽  
Author(s):  
Xinghua Zhu ◽  
Yuanpu Xu ◽  
Zhibin Lu ◽  
Qunji Xue
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
First Principles ◽  
Large Scale ◽  
Functional Group ◽  
Phase Method ◽  
Industrial Synthesis ◽  
Liquid Phase Method ◽  
Wales Defect ◽  
Wide Range

Graphene oxide is an important member of the graphene family which has a wide range of applications. The chemical method, especially the liquid phase method, is one of the most common and important methods for its preparation. However, the complex solution environment not only gives them rich structure, but also brings great challenges for its large-scale industrial synthesis. In order to better realize its industrial application, it is important to understand its structure, such as the source of oxygen-containing functional groups. Here we studied the contribution of four oxygenated acids to oxygen-containing functional groups in Hummers’ method using first principles. We found that the permanganic acid molecules that exist instantaneously due to energy fluctuations can be the source of oxygen-containing functional group. In addition, Stone-Wales defect have a certain effect on the formation of oxygen-containing functional groups, but this effect is not as good as that of solvation effect. This work provides a guide for exploring the source of oxygen-containing functional groups on graphene oxide.

Sign in / Sign up

Export Citation Format

Share Document