Hole-matrixed carbonylated graphene: Synthesis, properties, and highly-selective ammonia gas sensing

Rabchinskii, Maxim K.; Varezhnikov, Alexey S.; Sysoev, Victor V.; Solomatin, Maksim A.; Ryzhkov, Sergei A.; Байдакова, М. В.; Stolyarova, Dina Yu.; Shnitov, V. V.; Pavlov, Sergei S.; Kirilenko, D. A.; Shvidchenko, A. V.; Lobanova, E. Yu.; Gudkov, M. V.; Смирнов, Д. А.; Kislenko, Vitaliy A.; Павлов, С. В.; Kislenko, Sergey A.; Struchkov, Nikolay S.; Bobrinetskiy, Ivan; Emelianov, Aleksei V.; Liang, Pei; Liu, Z.; Brunkov, P. N.

doi:10.1016/j.carbon.2020.09.087

Cited by 39 publications

(50 citation statements)

References 70 publications

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“…The initial GO is functionalized by the hydroxyls and epoxides at the basal plane of the graphene layer along with the carbonyls and carboxyls at its edges. The presence of these functional groups is signified by the C–O–C&C–OH, C=O and COOH peaks centered at hv = 286.8 eV, hv = 288.2 eV and hv = 289.1 eV, respectively [ 42 , 43 ]. The C–V peak is related to the nonterminated carbon atoms of the vacancy defects and Stone–Wales defects [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

“…The relative concentration of the oxygenic groups and carbon atoms in various states is presented in Table 1 , whereas the C/O ratio was calculated to be 2.51. After the amination, all the spectral features related to the oxygenic groups were absent with the retention of only a dominant C=C peak at ~284.6 eV, corresponding to the pristine π-conjugated graphene network, and a C–C peak at ~285.1 eV related to nonconjugated C–C bonds [ 43 ]. The concentration of the preserved oxygenic groups is less than 3 at.% with the corresponding C/O ratio of rGO-Am of 32.51 ( Table 1 ).…”

Section: Resultsmentioning

confidence: 99%

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Aminated Graphene-Graft-Oligo(Glutamic Acid) /Poly(ε-Caprolactone) Composites: Preparation, Characterization and Biological Evaluation

et al. 2021

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Biodegradable and biocompatible composites are of great interest as biomedical materials for various regeneration processes such as the regeneration of bones, cartilage and soft tissues. Modification of the filler surface can improve its compatibility with the polymer matrix, and, as a result, the characteristics and properties of composite materials. This work is devoted to the synthesis and modification of aminated graphene with oligomers of glutamic acid and their use for the preparation of composite materials based on poly(ε-caprolactone). Ring-opening polymerization of N-carboxyanhydride of glutamic acid γ-benzyl ester was used to graft oligomers of glutamic acid from the surface of aminated graphene. The success of the modification was confirmed by Fourier-transform infrared and X-ray photoelectron spectroscopy as well as thermogravimetric analysis. In addition, the dispersions of neat and modified aminated graphene were analyzed by dynamic and electrophoretic light scattering to monitor changes in the characteristics due to modification. The poly(ε-caprolactone) films filled with neat and modified aminated graphene were manufactured and carefully characterized for their mechanical and biological properties. Grafting of glutamic acid oligomers from the surface of aminated graphene improved the distribution of the filler in the polymer matrix that, in turn, positively affected the mechanical properties of composite materials in comparison to ones containing the unmodified filler. Moreover, the modification improved the biocompatibility of the filler with human MG-63 osteoblast-like cells.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Aminated Graphene-Graft-Oligo(Glutamic Acid) /Poly(ε-Caprolactone) Composites: Preparation, Characterization and Biological Evaluation

et al. 2021

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“…The presented C 1s spectra clearly demonstrate the progressive reduction of the C-OH&C-O-C peak, with the simultaneous rise of the C=O and COOH peaks upon the transition from the KMnO 4 to K 2 Cr 2 O 7 as a main oxidizing agent. This is accompanied by the corresponding changes in the C K-edge X-ray absorption spectra of MC#1–MC#6 samples displayed in Figure 2 c. The drastic growth of the peak at hv = 288.8 eV corresponding to π*-resonance in the C=O and COOH groups is observed with the simultaneous diminishing of a spectral feature at hv = 289.6 eV, which is commonly attributed to the σ*-resonance of C-O bonds in basal-plane groups [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

“…Apparently, the edge sites of the graphene layer at these defects are terminated by the carboxyls and carbonyls, the number of which substantially increases from MC#1 to MC#6. Owing to spatial constraints, these oxygenic groups begin to have an out-of-plane orientation [ 21 ], leading to the additional distortion and corrugation of the graphene layer. Thus, collectively, the XRD, TEM, and SAED data imply that the oxidation of GO with high K 2 Cr 2 O 7 ratios in the reaction mixture results in the structural disorder of the graphene layers, expressed by the formation of the in-plane nanoscale defects inevitably accompanied by the out-of-plane sheet structural variations.…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that the ideal graphene structure is not required in all potential applications. An increasing number of studies have been devoted to the synthesis and application of graphenes modified with organic groups and having a defect structure, which—in many publications—are also called ‘functionalized graphenes’ or ‘chemically modified graphenes’ (CMGs) [ 19 , 20 , 21 , 22 ]. One of the most important CMGs is graphene oxide (GO), a nonstoichiometric derivative of graphene, the edges and surfaces of which are covered with various oxygen-containing functional groups.…”

Section: Introductionmentioning

confidence: 99%

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Graphene Oxide Chemistry Management via the Use of KMnO4/K2Cr2O7 Oxidizing Agents

et al. 2021

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In this paper, we propose a facile approach to the management of graphene oxide (GO) chemistry via its synthesis using KMnO4/K2Cr2O7 oxidizing agents at different ratios. Using Fourier Transformed Infrared Spectroscopy, X-ray Photoelectron Spectroscopy, and X-ray Absorption Spectroscopy, we show that the number of basal-plane and edge-located oxygenic groups can be controllably tuned by altering the KMnO4/K2Cr2O7 ratio. The linear two-fold reduction in the number of the hydroxyls and epoxides with the simultaneous three-fold rise in the content of carbonyls and carboxyls is indicated upon the transition from KMnO4 to K2Cr2O7 as a predominant oxidizing agent. The effect of the oxidation mixture’s composition on the structure of the synthesized GOs is also comprehensively studied by means of X-ray diffraction, Raman spectroscopy, transmission electron microscopy, atomic-force microscopy, optical microscopy, and the laser diffraction method. The nanoscale corrugation of the GO platelets with the increase of the K2Cr2O7 content is signified, whereas the 10–100 μm lateral size, lamellar, and defect-free structure is demonstrated for all of the synthesized GOs regardless of the KMnO4/K2Cr2O7 ratio. The proposed method for the synthesis of GO with the desired chemistry opens up new horizons for the development of graphene-based materials with tunable functional properties.

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Graphene‐Based Heterostructure Composite Sensing Materials for Detection of Nitrogen‐Containing Harmful Gases

Feng

Huang

2021

Adv Funct Materials

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Graphene-based heterostructure composite is a new type of advanced sensing material that includes composites of graphene with noble metals/ metal oxides/metal sulfides/polymers and organic ligands. Exerting the synergistic effect of graphene and noble metals/metal oxides/metal sulfides/polymers and organic ligands is a new way to design advanced gas sensors for nitrogen-containing gas species including NH 3 and NO 2 to solve the problems such as poor stability, high working temperature, poor recovery, and poor selectivity. Different fabrication methods of graphenebased heterostructure composite are extensively studied, enabling massive progress in developing chemiresistive-type sensors for detecting the nitrogen-containing gas species. With the components of noble metals/ metal oxides/metal sulfides/polymers and organic ligands which are composited with graphene, each material has its attractive and unique electrical properties. Consequently, the corresponding composite formed with graphene has different sensing characteristics. Furthermore, working ambient gas and response type can affect gas-sensitive characteristic parameters of graphene-based heterostructure composite sensing materials. Moreover, it requires particular attention in studying gas sensing mechanism of graphene-based heterostructure composite sensing materials for nitrogen-containing gas species. This review focuses on related scientific issues such as material synthesis methods, sensing performance, and gas sensing mechanism to discuss the technical challenges and several perspectives.

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Hole-matrixed carbonylated graphene: Synthesis, properties, and highly-selective ammonia gas sensing

Cited by 39 publications

References 70 publications

Aminated Graphene-Graft-Oligo(Glutamic Acid) /Poly(ε-Caprolactone) Composites: Preparation, Characterization and Biological Evaluation

Aminated Graphene-Graft-Oligo(Glutamic Acid) /Poly(ε-Caprolactone) Composites: Preparation, Characterization and Biological Evaluation

Graphene Oxide Chemistry Management via the Use of KMnO4/K2Cr2O7 Oxidizing Agents

Graphene‐Based Heterostructure Composite Sensing Materials for Detection of Nitrogen‐Containing Harmful Gases

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