Polyaniline-graphene oxide nanocomposites: Influence of nonconducting graphene oxide on the conductivity and oxidation-reduction mechanism of polyaniline

2016 ◽  
Vol 54 (23) ◽  
pp. 3778-3786 ◽  
Author(s):  
Vandana A. Mooss ◽  
Anjali A. Athawale
Keyword(s):  
Graphene Oxide ◽  
Reduction Mechanism ◽  
Oxidation Reduction

MICROWAVE ABSORBING PROPERTIES OF CO/REDUCED GRAPHENE OXIDE IN KU-BAND

2013 ◽  
Vol 06 (04) ◽  
pp. 1350042 ◽  
Author(s):  
SHUAI LIN ◽  
JINGHUA YU ◽  
FANGHUI WANG ◽  
YONGSHENG WEI ◽  
BAOGUO YUAN ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reflection Loss ◽  
Wide Frequency Range ◽  
Maximum Absorption ◽  
Frequency Range ◽  
Chemical Plating ◽  
Oxidation Reduction ◽  
Reduced Graphene ◽  
Plating Method

Reduced graphene oxide (RGO) was prepared by the oxidation-reduction method. Cobalt nanoparticles were coated on the surfaces of the graphene sheets by using a chemical plating method. The complex relative permittivity and permeability in the frequency range of 2–18 GHz were measured by using a vector network analyzer. The reflection loss curves of the materials were calculated using computer simulation. The simulated results showed that the reflection loss of Co /RGO was stronger than that of RGO. The maximum absorption peaks shifted to lower frequency region as the thickness increased. The reflection loss greater than -10 dB over a wide frequency range 12.5–17.5 GHz and the maximum absorption peak was -12.5 dB at 15.5 GHz at a thickness of 2 mm.

Selective Reduction Mechanism of Graphene Oxide Driven by the Photon Mode versus the Thermal Mode

ACS Nano ◽  
2019 ◽  
Vol 13 (9) ◽  
pp. 10103-10112 ◽  
Author(s):  
Masaki Hada ◽  
Kiyoshi Miyata ◽  
Satoshi Ohmura ◽  
Yusuke Arashida ◽  
Kohei Ichiyanagi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Selective Reduction ◽  
Thermal Mode ◽  
Reduction Mechanism ◽  
Photon Mode ◽  
Mode Versus

scholarly journals The Enhanced Performance of N-Modified Activated Carbon Promoted with Ce in Selective Catalytic Reduction of NOx with NH3

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1423
Author(s):  
Marwa Saad ◽  
Agnieszka Szymaszek ◽  
Anna Białas ◽  
Bogdan Samojeden ◽  
Monika Motak
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Reduction Mechanism ◽  
Modified Activated Carbon ◽  
Oxidation Reduction ◽  
Reduction Of Nox

The goal of the study was to modify activated carbon (AC) with nitrogen groups and ceria and to test the obtained materials in low temperature selective catalytic reduction of nitrogen oxides. For that purpose, the starting AC was oxidized with HNO3 of various concentrations, modified with urea and doped with 0.5 wt.% of Ce. It was observed that the increased concentration of acid influenced the catalytic activity, since textural and surface chemistry of activated carbon was changed. The most active sample was that modified with 14 M HNO3 and it reached 96% of NO conversion at 300 °C. Additionally, the addition of Ce improved the catalytic performance of modified AC, and NO was reduced according to oxidation–reduction mechanism, characteristic for supported metal oxides. Nevertheless, the samples promoted with Ce emitted significantly higher amount of CO2 comparing to the non-promoted ones.

Azathioprine Electrochemical Adsorption onto the Reduced Graphene Oxide Sheets in Absence and in the Presence of Polyaniline

2021 ◽  
Vol 21 (4) ◽  
pp. 2302-2311
Author(s):  
A. Udrescu ◽  
N. Toulbe ◽  
E. Matei ◽  
M. Baibarac
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Irreversible Process ◽  
Emeraldine Salt ◽  
Carbon Cycles ◽  
Reduction Processes ◽  
Oxidation Reduction ◽  
Reduced Graphene ◽  
Potential Applications ◽  
Electrochemical Adsorption

The azathioprine (AZA) electrochemical adsorption onto the screen-printed carbon electrodes (SPCE) modified with the reduced graphene oxide (RGO) sheets in the absence and in the presence of polyaniline–emeraldine salt (PANI-ES) is reported in this work. Using cyclic voltammetry (CV), in the case of the SPCE modified with the RGO sheets non-functionalized and functionalized with PANI-ES, respectively, an irreversible process at the electrode/electrolyte interface is highlighted to take place. In the case of the SPCE modified with the non-functionalized RGO sheets (SPCERGO), the oxidation-reduction processes induce an up-shift of the AZA Raman lines from 856 and 1011 cm-1 to 863 and 1020 cm-1, respectively. These variations indicate an AZA adsorption onto the surface of the SPCE modified with the RGO sheets that takes place throught the imidazole and pyrimidine cycles of mercaptopurine, when the generation of the π–π* bonds between the mercaptopurine structure and hexagonal carbon cycles of RGO occurs. The electrochemical functionalization of the RGO sheets with PANI-ES is proved by the appearance of the Raman lines at 1165, 1332-1371, 1496 and 1585 and 1616 cm-1. The oxidation-reduction processes induced at the interface of the SPCE modified with PANI-ES functionalized RGO sheets and the electrolyte consisting into a phosphate buffer (PB) and AZA lead to the generation of new positive charges onto the PANI macromolecular chain and the adsorption of the drug on the working electrode surface that takes place via the π–π* bonds established between the benzene/quinoide rings of PANI and the imidazole/ purine cycles of AZA. These results indicate that the SPCE modified with the PANI-ES functionalized RGO sheets shows potential applications in the field of sensors for AZA detection.

Oxidation-reduction mechanism of iron in dioctahedral smectites: I. Crystal chemistry of oxidized reference nontronites

2000 ◽  
Vol 85 (1) ◽  
pp. 133-152 ◽  
Author(s):  
A. Manceau ◽  
B. Lanson ◽  
V.A. Drits ◽  
D. Chateigner ◽  
W.P. Gates ◽  
...  
Keyword(s):  
Crystal Chemistry ◽  
Reduction Mechanism ◽  
Oxidation Reduction
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