scholarly journals Room-temperature diffusion of metal clusters on graphene

2021 ◽  
Author(s):  
Mohammad Zarshenas ◽  
Victor Gervilla ◽  
Davide G. Sangiovanni ◽  
Kostas Sarakinos
Keyword(s):  
Room Temperature ◽  
Metal Clusters ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Temperature Diffusion ◽  
Diffusion Dynamics ◽  
Diffusion Mechanisms

We study the diffusion dynamics, the diffusion mechanisms, and the adsorption energetics of Ag, Au, Cu, and Pd dimers, as well as of Ag trimers on single-layer graphene (SLG) by...

scholarly journals Room-temperature Diffusion of Metal Clusters on Graphene

2020 ◽  
Author(s):  
Mohammad Zarshenas ◽  
Víctor Gervilla ◽  
Davide Sangiovanni ◽  
Kostas Sarakinos
Keyword(s):  
Density Functional ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Metal Contacts ◽  
Au Clusters ◽  
Potential Energy Landscape ◽  
Temperature Diffusion ◽  
Diffusion Dynamics ◽  
Diffusion Mechanisms ◽  
Metal Layers

Abstract We study the diffusion dynamics, the diffusion mechanisms, and the adsorption energetics of Ag, Au, Cu, and Pd, dimers, as well as of Ag trimers on single-layer graphene (SLG) by means of ab initio molecular dynamics (AIMD) simulations and density-functional theory (DFT) calculations. The simulations show that Ag, Cu, and Au clusters exhibit a super-diffusive pattern characterized by long jumps, which can be explained by the flat potential energy landscape (PEL) (corrugation of a few tens of meV) encountered by those clusters on SLG. Pd dimers, instead, diffuse in a pattern that is reminiscent of conventional random walk, which is consistent with a significantly rougher PEL of the order of 100 meV. Moreover, our data show that all clusters exhibit diffusion mechanisms that include both concerted translation and rotation. The overall results of the present study provide key insights for modeling the growth of metal layers and nanostructures on graphene and other van der Waals materials, which is a prerequisite for the directed growth of multifunctional metal contacts in a broad range of enabling devices.

Electrochemical Epitaxial (200) PbSe submicron-plates on Single-Layer Graphene for Ultrafast Infrared Response

2021 ◽  
Author(s):  
Chan Yang ◽  
Shuanglong Feng ◽  
Yinye Yu ◽  
Jun Shen ◽  
Xingzhan Wei ◽  
...  
Keyword(s):  
Room Temperature ◽  
Single Layer ◽  
Infrared Detection ◽  
Single Layer Graphene ◽  
Robust Detection ◽  
Layer Graphene ◽  
Highly Efficient ◽  
Low Visibility ◽  
Ultrafast Infrared

Highly efficient near and medium-wave infrared detection at room temperature is considered one of the most intensive studies due to their robust detection in foggy weather or other low visibility...

scholarly journals Probable Cause for the Superconductor-Like Properties of Alkane-Wetted Graphite and Single-Layer Graphene above Room Temperature under Ambient Pressure

2018 ◽  
Author(s):  
Myung-Hwan Whangbo
Keyword(s):  
Fermi Surface ◽  
Acoustic Phonon ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Strong Support ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Strong Electron ◽  
Layer Graphene ◽  
Fermi Surface Nesting

Recently Kawashima has reported that, when wetted with alkanes, several forms of graphite and single-layer graphene exhibit superconductor-like properties above room temperature under ambient pressure [AIP Adv. 2013, 3, 052132; arXiv:1612.05294; arXiv:1801.09376]. Under the assumption that these seemingly unlikely properties arise from the presence of paired electrons brought about by the alkane-wetting, we explored their implications to arrive at a probable mechanism for strong electron-pairing driven by Fermi surface nesting and acoustic phonon. This mechanism explains why alkane-wetting is essential for the graphene systems to become “superconductor-like” above room temperature and why the “Tc” of alkane-wetted pitch-based graphite fibers increases almost linearly from ~363 to ~504 K with increasing the molecular weight of alkane from heptane to hexadecane. It also provides a number of experimentally-verifiable predictions, the confirmation of which will provide a strong support for the superconductivity driven by Fermi surface nesting and acoustic phonon.

scholarly journals Probable Cause for the Superconductor‐like Properties of Alkane-wetted Graphite and Single-layer Graphene Above Room Temperature Under Ambient Pressure

2018 ◽  
Author(s):  
mike whangbo
Keyword(s):  
Fermi Surface ◽  
Acoustic Phonon ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Strong Support ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Fermi Surface Nesting ◽  
Graphite Fibers

<div>Recently Kawashima has reported that, when wetted with alkanes, several forms of graphite and single‐layer graphene exhibit superconductor‐like properties above room temperature under ambient pressure [AIP Adv. 2013, 3, 052132; arXiv:1612.05294; arXiv:1801.09376]. Under the assumption that these seemingly unlikely properties arise from the presence of paired electrons brought about by the</div><div>alkane‐wetting, we explored their implications to arrive at a probable mechanism for strong electronpairing</div><div>driven by Fermi surface nesting and acoustic phonon. This mechanism explains why alkane‐wetting is essential for the graphene systems to become “superconductor‐like” above room temperature and why the “Tc” of alkane‐wetted pitch‐based graphite fibers increases almost linearly from ~363 to ~504 K with increasing the molecular weight of alkane from heptane to hexadecane. It also provides a number of</div><div>experimentally‐verifiable predictions, the confirmation of which will provide a strong support for the superconductivity driven by Fermi surface nesting and acoustic phonon.</div>

scholarly journals Influence of SiO2 or h-BN substrate on the room-temperature electronic transport in chemically derived single layer graphene

RSC Advances ◽  
2019 ◽  
Vol 9 (65) ◽  
pp. 38011-38016 ◽  
Author(s):  
Zhenping Wang ◽  
Qirong Yao ◽  
Yalei Hu ◽  
Chuan Li ◽  
Marleen Hußmann ◽  
...  
Keyword(s):  
Electronic Transport ◽  
Basal Plane ◽  
Room Temperature ◽  
Dirac Point ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene

Defects in graphene cause scattering and basal plane interactions shift the Dirac-point.

scholarly journals Near Room-Temperature Memory Devices Based on Hybrid Spin-Crossover@SiO2Nanoparticles Coupled to Single-Layer Graphene Nanoelectrodes

2016 ◽  
Vol 28 (33) ◽  
pp. 7228-7233 ◽  
Author(s):  
Anastasia Holovchenko ◽  
Julien Dugay ◽  
Mónica Giménez-Marqués ◽  
Ramón Torres-Cavanillas ◽  
Eugenio Coronado ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Memory Devices ◽  
Layer Graphene

scholarly journals Probable Cause for the Superconductor‐like Properties of Alkane-wetted Graphite and Single-layer Graphene Above Room Temperature Under Ambient Pressure

2018 ◽  
Author(s):  
mike whangbo
Keyword(s):  
Fermi Surface ◽  
Acoustic Phonon ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Strong Support ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Fermi Surface Nesting ◽  
Graphite Fibers

<div>Recently Kawashima has reported that, when wetted with alkanes, several forms of graphite and single‐layer graphene exhibit superconductor‐like properties above room temperature under ambient pressure [AIP Adv. 2013, 3, 052132; arXiv:1612.05294; arXiv:1801.09376]. Under the assumption that these seemingly unlikely properties arise from the presence of paired electrons brought about by the</div><div>alkane‐wetting, we explored their implications to arrive at a probable mechanism for strong electronpairing</div><div>driven by Fermi surface nesting and acoustic phonon. This mechanism explains why alkane‐wetting is essential for the graphene systems to become “superconductor‐like” above room temperature and why the “Tc” of alkane‐wetted pitch‐based graphite fibers increases almost linearly from ~363 to ~504 K with increasing the molecular weight of alkane from heptane to hexadecane. It also provides a number of</div><div>experimentally‐verifiable predictions, the confirmation of which will provide a strong support for the superconductivity driven by Fermi surface nesting and acoustic phonon.</div>

scholarly journals Graphene: Room‐Temperature Colossal Magnetoresistance in Terraced Single‐Layer Graphene (Adv. Mater. 37/2020)

2020 ◽  
Vol 32 (37) ◽  
pp. 2070282
Author(s):  
Junxiong Hu ◽  
Jian Gou ◽  
Ming Yang ◽  
Ganesh Ji Omar ◽  
Junyou Tan ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Room Temperature ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene
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