Graphene oxide conversion into controllably carboxylated graphene layers via photoreduction process in the inert atmosphere

Rabchinskii, Maxim K.; Shnitov, V. V.; Stolyarova, Dina Yu.; Ryzhkov, Sergei A.; Байдакова, М. В.; Lobanova, E. Yu.; Shvidchenko, A. V.; Besedina, Nadezhda A.; Смирнов, Д. А.

doi:10.1080/1536383x.2019.1686625

Cited by 17 publications

(17 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…C‐xy graphene was synthesized according to the method described in Ref. [28,58]. GO film deposited on the desired substrate (silicon/quartz wafer, TEM grid, multisensory chip, etc.)…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Valence Band Structure Engineering in Graphene Derivatives

Shnitov

Rabchinskii

Brzhezinskaya

et al. 2021

Small

Self Cite

View full text Add to dashboard Cite

Engineering of the 2D materials’ electronic structure is at the forefront of nanomaterials research nowadays, giving an advance in the development of next‐generation photonic devices, e‐sensing technologies, and smart materials. Herein, employing core‐level spectroscopy methods combined with density functional theory (DFT) modeling, the modification of the graphenes’ valence band (VB) upon its derivatization by carboxyls and ketones is revealed. The appearance of a set of localized states in the VB of graphene related to molecular orbitals of the introduced functionalities is signified both experimentally and theoretically. Applying the DFT calculations of the density of states projected on the functional groups, their contributions to the VB structure are decomposed. An empirical approach, allowing one to analyze and predict the impact of a certain functional group on the graphenes’ electronic structure in terms of examination of the model molecules, mimicking the introduced functionality, is proposed and validated. The interpretation of the arising states origin is made and their designation, pointing out their symmetry type, is proposed. Taken together, these results guide the band structure engineering of graphene derivatives and give a hint on the mechanisms underlying the alteration of the VB structure of 2D materials upon their derivatization.

show abstract

“…C‐xy graphene was synthesized according to the method described in Ref. [28,58]. GO film deposited on the desired substrate (silicon/quartz wafer, TEM grid, multisensory chip, etc.)…”

Section: Methodsmentioning

confidence: 99%

“…with the constant flow of argon, resulting in the conversion of GO into C‐xy graphene according to the mechanism described in Ref. [58]. The temperature of the sample during the irradiation has not exceeded T = 35 °C.…”

Section: Methodsmentioning

confidence: 99%

Valence Band Structure Engineering in Graphene Derivatives

Shnitov

Rabchinskii

Brzhezinskaya

et al. 2021

Small

Self Cite

View full text Add to dashboard Cite

show abstract

“…Table 1 summarizes the quantitative data on the composition of the studied CMGs derived from the processed C 1 s spectra. The initial GO is mainly covered by the hydroxyls and epoxides signified by a prominent C-OH&C-O-C peak with the BE of 286.8 eV, to be accompanied with the presence of ketones and carboxyls at the edges, which are expressed in C 1 s spectra by C=O and COOH peaks centered at 288.1 eV and 289.0 eV, respectively [ 10 , 12 , 43 ]. The relative concentrations of these oxygen species are 37.3 at.%, 4.26 at.%, and 1.26 at.%, correspondingly, yielding the C/O ratio of 2.3.…”

Section: Resultsmentioning

confidence: 99%

“…Fluorographene and graphane were found to be wide-gap semiconductors with resistance values beyond GΩ and a bandgap of about 3–3.5 eV [ 7 , 8 ], whereas amination was demonstrated to enhance the conductivity of the reduced GO due to the n-doping from the introduced primary amines, along with the local reduction of the work function value from 4.6 to 4.2 eV [ 9 ]. Depending on the concentration and density of the carbonyl or carboxyl groups, the alteration of the conductivity within the range of several hundreds of Ω to MΩ with the substantial modification of the valence band were found for the carbonylated and carboxylated graphene derivatives [ 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Blueprint for the Synthesis and Characterization of Thiolated Graphene

et al. 2021

Self Cite

View full text Add to dashboard Cite

Graphene derivatization to either engineer its physical and chemical properties or overcome the problem of the facile synthesis of nanographenes is a subject of significant attention in the nanomaterials research community. In this paper, we propose a facile and scalable method for the synthesis of thiolated graphene via a two-step liquid-phase treatment of graphene oxide (GO). Employing the core-level methods, the introduction of up to 5.1 at.% of thiols is indicated with the simultaneous rise of the C/O ratio to 16.8. The crumpling of the graphene layer upon thiolation without its perforation is pointed out by microscopic and Raman studies. The conductance of thiolated graphene is revealed to be driven by the Mott hopping mechanism with the sheet resistance values of 2.15 kΩ/sq and dependable on the environment. The preliminary results on the chemiresistive effect of these films upon exposure to ethanol vapors in the mix with dry and humid air are shown. Finally, the work function value and valence band structure of thiolated graphene are analyzed. Taken together, the developed method and findings of the morphology and physics of the thiolated graphene guide the further application of this derivative in energy storage, sensing devices, and smart materials.

show abstract

“…The technology for obtaining graphene oxide and the analysis of the resulting material were described in detail elsewhere [ 22 ]. The reduction of graphene was carried out using ultraviolet irradiation of graphene oxide films [ 23 , 24 ]. The UV irradiation procedure was carried out in an argon atmosphere and described elsewhere [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

et al. 2021

View full text Add to dashboard Cite

This work presents our study results of the magnetization of multilayer UV-reduced graphene oxide (UV-rGO), polymer matrix (polystyrene), and a conjugated composite based on them. The mesoscopic structure of the composites synthesized in this work was studied by such methods as X-ray diffraction, SEM, as well as NMR-, IR- and Raman spectroscopy. The magnetization of the composites under investigation and their components was measured using a vibrating-sample magnetometer. It has been shown that the UV-reduction process leads to the formation of many submicron holes distributed inside rGO flakes, which can create edge defects, causing possibly magnetic order in the graphite samples under investigation on the mesoscopic level. This article provides an alternative explanation for the ferromagnetic hysteresis loop in UV-rGO on the base of superconductivity type-II.

show abstract

Graphene oxide conversion into controllably carboxylated graphene layers via photoreduction process in the inert atmosphere

Cited by 17 publications

References 29 publications

Valence Band Structure Engineering in Graphene Derivatives

Valence Band Structure Engineering in Graphene Derivatives

A Blueprint for the Synthesis and Characterization of Thiolated Graphene

Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

Contact Info

Product

Resources

About