Electronic transport properties of nanoribbons of graphene and ψ-graphene -based lactate nanobiosensor

Khatir, Nadia Mahmoudi; Ahmadi, Aidin; Taghizade, Narges; khameneh, Samane Motevali; Faghihnasiri, Mahdi

doi:10.1016/j.spmi.2020.106603

Cited by 11 publications

(7 citation statements)

References 30 publications

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“…The BTA molecules had higher hydrophilicity than 2020A, so BTA tended to migrate to the water/oil interfaces according to the phase separation principles [ 7 ]. Graphene-based materials had strong absorption properties [ 26 ]. As a result, BTA promoted the formation of the GO microcapsules by interacting with GO at the interfaces, which in turn provided a robust encapsulation of the core materials.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Dual Functional Graphene Oxide Microcapsules Carrying Corrosion Inhibitor and Encapsulating Self-Healing Agent

Tao

Cui

et al. 2022

Polymers

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Dual functional graphene oxide (GO) microcapsules were fabricated through self-assembly in Pickering emulsions, carrying corrosion inhibitor benzotriazole (BTA) on the microcapsule shells and encapsulating a self-healing agent epoxy monomer. The formation of the GO microcapsules was assisted by the interaction between BTA and GO, which provided robust encapsulation for the epoxy monomer. The loading capacity of BTA and epoxy monomer reached 90.5%. The addition of the GO microcapsules simultaneously promoted the corrosion protection and self-healing properties of the waterborne epoxy composite coatings. The healing efficiency of the composite coatings reached over 99.7% when the content of the microcapsules was 10 wt%. Meanwhile, the corrosion current density of the intact coatings was decreased for around 50 times.

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Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Dual Functional Graphene Oxide Microcapsules Carrying Corrosion Inhibitor and Encapsulating Self-Healing Agent

Tao

Cui

et al. 2022

Polymers

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“…CNSs can be synthesized by top-down and bottom-up approaches [ 7 ]. Top-down approaches refer to the physical or chemical decomposition of larger carbon materials such as graphite [ 8 ], carbon nanotubes [ 8 ], graphite oxide [ 9 ], graphene oxide (graphene oxide is chemically similar to graphite oxide, but structurally it is very different) [ 10 , 11 , 12 ], activated carbon [ 13 ], nanofibers [ 14 ], and soot [ 15 ] into smaller carbon fragments, including CNSs. The widespread top-down approaches are arc discharge [ 16 ], lasers [ 17 ], and electrochemical methods [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

A Facile Approach to the Hydrothermal Synthesis of Silica Nanoparticle/Carbon Nanostructure Luminescent Composites

2022

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Luminescent carbon nanostructures (CNSs) have been intensively researched, but there is still no consensus on a fundamental understanding of their structure and properties that limits their potential applications. In this study, we developed a facile approach to the synthesis of luminescent composite SiO2 nanoparticles/CNSs by the targeted formation of a molecular fluorophore, as the significant luminescent component of CNSs, on the surface of a silica matrix during a one-stage hydrothermal synthesis. Silica nanoparticles were synthesized by reverse microemulsion and used as a matrix for luminescent composites. The as-prepared silica nanoparticles had a functional surface, a spherical shape, and a narrow size distribution of about 29 nm. One-stage hydrothermal treatment of citric acid and modified silica nanoparticles made it possible to directly form the luminescent composite. The optical properties of composites could be easily controlled by changing the hydrothermal reaction time and temperature. Thus, we successfully synthesized luminescent composites with an emission maximum of 450 nm, a quantum yield (QY) of 65 ± 4%, and an average size of ~26 nm. The synthesis of fluorophore doped composite, in contrast to CNSs, makes it possible to control the shape, size, and surface functionality of particles and allows for avoiding difficult and time-consuming fractionation steps.

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“…DFT is a quantum chemical theory in which the electronic charge density is the basic quantity used to determine the ground state properties of a many-body quantum system. First, the optimized geometrical structure corresponding to the minimum on the potential energy surface has to be obtained [ 27 , 28 , 29 , 30 ], and then harmonic vibrational frequencies are calculated using analytical second-order derivatives [ 27 ]. To obtain the assignments of the Raman bands, the polarizability derivatives, with respect to the normal coordinates, have to be extracted.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Co-Adsorbed Ions on the Surface-Enhanced Raman Scattering Spectra of Dopamine Adsorbed on Nanostructured Silver

2022

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The abnormal metabolism or imbalance of dopamine may lead to some neurological disorders. Therefore, the facile and fast detection of this neurotransmitter is essential in the early diagnosis of some diseases. One of the methods that can be used for the detection and determination of dopamine is the surface-enhanced Raman scattering (SERS). In this contribution, we report a very strong influence of some salts (we used salts containing Na+ cations and the following anions: SO42−, F−, Cl−, Br−, and I−) on the spectral patterns and intensity of the SERS spectra of dopamine adsorbed on a nanostructured macroscopic silver substrate. The analysis of the recorded SERS spectra based on the assignments of Raman bands from the density-functional theory (DFT) calculations and based on the SERS surface selection rules reveals that when molecules of dopamine are adsorbed from an aqueous solution to which no electrolytes have been added, they adopt a flat orientation versus the silver surface; whereas, the molecules of dopamine co-adsorbed with various ions interact with the silver surface, mainly via phenolic groups, and they adopt a perpendicular orientation versus the metal surface. An addition of electrolytes also significantly influences the intensity of the recorded SERS spectrum; for example, an addition of Na2SO4 to a final concentration of 1 M induces an increase in the intensity of the measured SERS spectrum by a factor of ca. 40. This means that the addition of electrolytes to the analyzed solution can reduce the limit of detection of dopamine by SERS spectroscopy. The abovementioned findings may facilitate the construction of dopamine SERS sensors.

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Electronic transport properties of nanoribbons of graphene and ψ-graphene -based lactate nanobiosensor

Cited by 11 publications

References 30 publications

Facile Fabrication of Dual Functional Graphene Oxide Microcapsules Carrying Corrosion Inhibitor and Encapsulating Self-Healing Agent

Facile Fabrication of Dual Functional Graphene Oxide Microcapsules Carrying Corrosion Inhibitor and Encapsulating Self-Healing Agent

A Facile Approach to the Hydrothermal Synthesis of Silica Nanoparticle/Carbon Nanostructure Luminescent Composites

Influence of the Co-Adsorbed Ions on the Surface-Enhanced Raman Scattering Spectra of Dopamine Adsorbed on Nanostructured Silver

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