Establishing the applicability of the laser diffraction technique for the graphene oxide platelets lateral size measurements

Rabchinskii, Maxim K.; Saveliev, Svyatoslav D.; Ryzhkov, Sergei A.; Nepomnyashchaya, Elina; Pavlov, Sergei I.; Байдакова, М. В.; Brunkov, P. N.

doi:10.1088/1742-6596/1695/1/012070

Cited by 11 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To examine the size distributions of the GO and C‐ xy graphene flakes by means of the LD method, aqueous suspensions of the studied CMGs, of 0.01 wt% of concentration, were measured using a Mastersizer 2000 (Malvern Panalytical, UK) in accordance with the procedure described earlier by Rabchinskii et al. [ 78 ]…”

Section: Methodsmentioning

confidence: 99%

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Rabchinskii

Sysoev

Glukhova

et al. 2022

Adv Materials Technologies

View full text Add to dashboard Cite

Engineering the physics and chemistry of 2D materials is a key to unlock the potential of the advanced e‐nose technologies limited by the current semiconductor technologies. Herein, the adjustment of the graphene's morphology, physics, and gas sensing properties upon its carboxylation via the developed photochemical method is demonstrated. Formation of matrices of nanoscale holes yet with the retention of the lamellar structure of the graphene layer is signified upon the introduction of up to 9.5 at% of carboxyl groups. The impact of the applied carboxylation on the conduction mechanism and electronic structure is demonstrated. The appearance of a set of the localized states in the valence band is revealed, originating from the molecular orbitals of carboxyls as is signified by the proposed approach for the identification of electronic states in graphene chemical derivatives. Given holey structure, predominance of highly affine carboxyls, and lateral inhomogeneity, the enhanced detection and discrimination of various alcohols, acetone, and ammonia vapors at room temperature is demonstrated. The opposite chemiresistive response toward ammonia in the humid air is also experimentally revealed and justified by the performed density functional theory modeling on the effect of ammonia, water, and their mix on electronic structure, and resistivity of the carboxylated graphene.

show abstract

Section: Methodsmentioning

confidence: 99%

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Rabchinskii

Sysoev

Glukhova

et al. 2022

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…The complex refractive index for GO was set as 2.3 + 0.01i according to published data, [ 61 ] and the Fraunhofer model was chosen for the scattering pattern processing as the most appropriate for the 2D GO platelets. [ 62 ]…”

Section: Methodsmentioning

confidence: 99%

Valence Band Structure Engineering in Graphene Derivatives

Shnitov

Rabchinskii

Brzhezinskaya

et al. 2021

Small

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

“…The size distributions of the GO and rGO–Th platelets were also examined by means of the laser diffraction (LD) method. GO and rGO–Th aqueous suspensions, of 0.01 wt.% of concentration, were examined using a Mastersizer 2000 (Malvern Panalytical, Malvern, Worcestershire, UK) in accordance with the procedure described earlier by Rabchinskii et al [ 36 ].…”

Section: Methodsmentioning

confidence: 99%

A Blueprint for the Synthesis and Characterization of Thiolated Graphene

et al. 2021

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

Establishing the applicability of the laser diffraction technique for the graphene oxide platelets lateral size measurements

Cited by 11 publications

References 15 publications

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Valence Band Structure Engineering in Graphene Derivatives

A Blueprint for the Synthesis and Characterization of Thiolated Graphene

Contact Info

Product

Resources

About