Layer-dependent catalysis of MoS2/graphene nanoribbon composites for efficient hydrodesulfurization

2017 ◽  
Vol 7 (3) ◽  
pp. 693-702 ◽  
Author(s):  
Lan Yang ◽  
Xuzhen Wang ◽  
Yang Liu ◽  
Zhengfa Yu ◽  
Rui Li ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Single Layer ◽  
Catalytic Performance ◽  
Graphene Nanoribbon

Graphene nanoribbons (GNRs) with a defect-rich structure facilitate the preparation of a single-layer MoS2/GNR composite which shows superior catalytic performance than SL-MoS2/GS.

scholarly journals Finding Stable Graphene Conformations from Pull and Release Experiments with Molecular Dynamics

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Ruslan D. Yamaletdinov ◽  
Yuriy V. Pershin
Keyword(s):  
Molecular Dynamics ◽  
Transition Probabilities ◽  
Graphene Nanoribbons ◽  
Single Layer ◽  
Graphene Nanoribbon ◽  
Single Layer Graphene ◽  
Theoretical Studies ◽  
Folded Structures ◽  
Dynamics Simulations ◽  
Favorable Conditions

Abstract Here, we demonstrate that stable conformations of graphene nanoribbons can be identified using pull and release experiments, when the stretching force applied to a single-layer graphene nanoribbon is suddenly removed. As it is follows from our numerical experiments performed by means of molecular dynamics simulations, in such experiments, favorable conditions for the creation of folded structures exist. Importantly, at finite temperatures, the process of folding is probabilistic. We have calculated the transition probabilities to folded conformations for a graphene nanoribbon of a selected size. Moreover, the ground state conformation has been identified and it is shown that its type is dependent on the nanoribbon length. We anticipate that the suggested pull and release approach to graphene folding may find applications in the theoretical studies and fabrication of emergent materials and their structures.

Shedding Light on Pseudocapacitive Active Edges of Single-Layer Graphene Nanoribbons as High-Capacitance Supercapacitors

2019 ◽  
Vol 2 (5) ◽  
pp. 3665-3675 ◽  
Author(s):  
Mohammad Qorbani ◽  
Ali Esfandiar ◽  
Hamid Mehdipour ◽  
Marc Chaigneau ◽  
Azam Irajizad ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Single Layer ◽  
Single Layer Graphene ◽  
High Capacitance ◽  
Layer Graphene

Energy gap opening by crossing drop cast single-layer graphene nanoribbons

2018 ◽  
Vol 29 (31) ◽  
pp. 315705 ◽  
Author(s):  
Toyo Kazu Yamada ◽  
Hideto Fukuda ◽  
Taizo Fujiwara ◽  
Polin Liu ◽  
Kohji Nakamura ◽  
...  
Keyword(s):  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Gap Opening

scholarly journals On-surface synthesis of superlattice arrays of ultra-long graphene nanoribbons

2018 ◽  
Vol 54 (68) ◽  
pp. 9402-9405 ◽  
Author(s):  
Cesar Moreno ◽  
Markos Paradinas ◽  
Manuel Vilas-Varela ◽  
Mirko Panighel ◽  
Gustavo Ceballos ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Graphene Nanoribbon

We report the on-surface synthesis of graphene nanoribbon superlattice arrays directed by the herringbone reconstruction of the Au(111) surface.

scholarly journals Vibrational signature of the graphene nanoribbon edge structure from high-resolution electron energy-loss spectroscopy

Nanoscale ◽  
2020 ◽  
Vol 12 (38) ◽  
pp. 19681-19688
Author(s):  
Nicola Cavani ◽  
Marzio De Corato ◽  
Alice Ruini ◽  
Deborah Prezzi ◽  
Elisa Molinari ◽  
...  
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Electron Energy ◽  
Theoretical Investigation ◽  
Electron Energy Loss Spectroscopy ◽  
Graphene Nanoribbons ◽  
Graphene Nanoribbon ◽  
Edge Structure ◽  
Resolution Electron ◽  
Electron Energy Loss

A combined experimental and theoretical investigation of the vibrational signatures of on-surface synthesized graphene nanoribbons demonstrates the potentiality of HREELS in disclosing the details of their edge structure.

scholarly journals Graphene nanoribbon blends with P3HT for organic electronics

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6301-6314 ◽  
Author(s):  
Mirella El Gemayel ◽  
Akimitsu Narita ◽  
Lukas F. Dössel ◽  
Ravi S. Sundaram ◽  
Adam Kiersnowski ◽  
...  
Keyword(s):  
Organic Electronics ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Graphene Nanoribbons ◽  
Graphene Nanoribbon ◽  
Solution Processed ◽  
Regioregular Poly ◽  
Effect Transistor

Solution processed 18 arm-chair graphene nanoribbons embedded in a matrix of regioregular poly(3-hexylthiophene) show improved photoconductivity and field-effect transistor performance.

scholarly journals Accuracy of 2D modeling approach for performance simulation of noncircular single- and dual-layer monolithic catalysts

2021 ◽  
Author(s):  
Behnam Mozaffari
Keyword(s):  
Cross Sections ◽  
Three Dimensional ◽  
Single Layer ◽  
Flow Region ◽  
3D Models ◽  
Catalytic Performance ◽  
Cross Sectional ◽  
2D Modeling ◽  
Modeling Approach ◽  
Monolithic Catalysts

This study aims to evaluate the accuracy of widely applied approach of modeling noncircular channels and washcoats of monolithic catalysts with equivalent circular geometrical shapes. For this purpose, catalytic performance of equivalent circular and square channel cross-sectional shapes with single-layer Pt/Al2O3 and dual-layer Fe-ZSM-5+Pt/Al2O3 washcoats are investigated. For the noncircular cross-sections, three-dimensional computational fluid dynamics models that consider species gases convection inside the channel bulk flow region, and reaction and diffusion of species inside the washcoat layer(s) are utilized to simulate the performance of one channel of the monolithic catalytic converters. In addition, in order to investigate the amount of inaccuracy of 2D modeling approach for noncircular channels, 2D models are applied to simulate the equivalent monolithic catalysts with circular cross-sections, and the results of the 2D and 3D models are compared together, and also, with the experimental and 1D+1D modeling technique results available in the literature.

scholarly journals A Study on Different Bandwidths and Rim Decorations’ Influence on the Mechanical Properties of Graphene Nanoribbon

2021 ◽  
Vol 2083 (2) ◽  
pp. 022108
Author(s):  
Guo Ziliang
Keyword(s):  
Mechanical Properties ◽  
Modulus Of Elasticity ◽  
Graphene Nanoribbons ◽  
Graphene Nanoribbon ◽  
First Principle ◽  
Ideal Strength ◽  
The Future ◽  
The Ideal

Abstract This paper structured the Graphene Nanoribbon with different bandwidths and rim decorations and obtained the ideal strength and modulus of elasticity based on the calculation under the First Principle. It can be known that the mechanical properties of Graphene Nanoribbon are close to that of graphene, which have less changes with different bandwidth. However, the mechanical properties would be influenced by different decorations which may change the electronic connection state of edge carbon atoms. The results found in this paper can provide some reference for researchers to study the mechanical properties of graphene nanoribbons in the future.

scholarly journals Acoustoelectric current in graphene nanoribbon due to Landau damping

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
K. A. Dompreh ◽  
K. W. Adu ◽  
D. Sakyi-Arthur ◽  
N. G. Mensah ◽  
S. Y. Mensah ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Drift Velocity ◽  
Acoustic Phonon ◽  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Graphene Nanoribbon ◽  
Phonon Energy ◽  
Landau Damping ◽  
Potential Candidate ◽  
Acoustoelectric Current

AbstractWe perform self-consistent analysis of the Boltzmann transport equation for momentum and energy in the hypersound regime i.e., $$ql \gg 1$$ q l ≫ 1 ($$q$$ q is the acoustic wavenumber and l is the mean free path). We investigate the Landau damping of acoustic phonons ($$LDOAP$$ LDOAP ) in graphene nanoribbons, which leads to acoustoelectric current generation. Under a non-quantized field with drift velocity, we observed an acoustic phonon energy quantization that depends on the energy gap, the width, and the sub-index of the material. An effect similar to Cerenkov emission was observed, where the electron absorbed the confined acoustic phonon energy, causing the generation of acoustoelectric current in the graphene nanoribbon. A qualitative analysis of the dependence of the absorption coefficient and the acoustoelectric current on the phonon frequency is in agreement with experimental reports. We observed a shift in the peaks when the energy gap and the drift velocity were varied. Most importantly, a transparency window appears when the absorption coefficient is zero, making graphene nanoribbons a potential candidate for use as an acoustic wave filter with applications in tunable gate-controlled quantum information devices and phonon spectrometers.

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