scholarly journals An Analytical Multiple-Temperature Model for Flash Laser Irradiation on Single-Layer Graphene

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1319
Author(s):  
Anca M. Bucă ◽  
Mihai Oane ◽  
Ion N. Mihăilescu ◽  
Muhammad Arif Mahmood ◽  
Bogdan A. Sava ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Heat Equations ◽  
Quantum Field Theories ◽  
Temperature Model ◽  
Green Function Method ◽  
Classical Mathematics ◽  
Nonequilibrium Green Function ◽  
Simple Equations

A Multiple-Temperature Model is proposed to describe the flash laser irradiation of a single layer of graphene. Zhukovsky’s mathematical approach is applied to solve the Fourier heat equations based upon quantum concepts, including heat operators. Easy solutions were inferred with respect to classical mathematics. Thus, simple equations were set for the electrons and phonon temperatures in the case of flash laser treatment of a single layer of graphene. Our method avoids the difficulties and extensive time-consuming nonequilibrium green function method or quantum field theories when applied in a condensed matter. Simple expressions were deduced that could prove useful for researchers.

Evaluating Single Layer Graphene Micropatterns Induced by Ti:Sa Laser Irradiation

2018 ◽  
Author(s):  
Somayeh Mortazavi ◽  
Mahmoud Mollabashi ◽  
Rasoul Barri ◽  
Jesus Nieto Pescador ◽  
Lars Gundlach ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene

scholarly journals Spontaneous micro-modification of single-layer graphene induced by femtosecond laser irradiation

2017 ◽  
Vol 111 (24) ◽  
pp. 241901 ◽  
Author(s):  
Chen Cheng ◽  
Ruiyun He ◽  
Carolina Romero ◽  
Javier R. Vázquez de Aldana ◽  
Feng Chen
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Single Layer ◽  
Femtosecond Laser Irradiation ◽  
Single Layer Graphene ◽  
Layer Graphene

scholarly journals Graphene on SiC Substrate as Biosensor: Theoretical Background, Preparation, and Characterization

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 590 ◽  
Author(s):  
Alexander A. Lebedev ◽  
Sergey Yu Davydov ◽  
Ilya A. Eliseyev ◽  
Alexander D. Roenkov ◽  
Oleg Avdeev ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Graphene Film ◽  
Single Layer ◽  
Theoretical Background ◽  
Single Layer Graphene ◽  
Surface Model ◽  
Green Function Method ◽  
Graphene Films ◽  
Sensor Structure ◽  
The Green Function

This work is devoted to the development and optimization of the parameters of graphene-based sensors. The graphene films used in the present study were grown on semi-insulating 6H-SiC substrates by thermal decomposition of SiC at the temperature of ~1700 °C. The results of measurements by Auger and Raman spectroscopies confirmed the presence of single-layer graphene on the silicon carbide surface. Model approach to the theory of adsorption on epitaxial graphene is presented. It is demonstrated that the Green-function method in conjunction with the simple substrate models permit one to obtain analytical results for the charge transfer between adsorbed molecules and substrate. The sensor structure was formed on the graphene film by laser. Initially, a simpler gas sensor was made. The sensors developed in this study demonstrated sensitivity to the NO2 concentration at the level of 1–0.01 ppb. The results obtained in the course of development and the results of testing of the graphene-based sensor for detection of protein molecules are also presented. The biosensor was fabricated by the technology previously developed for the gas sensor. The working capacity of the biosensor was tested with an immunochemical system constituted by fluorescein and monoclonal antibodies (mAbs) binding this dye.

Micropatterning of CVD single layer graphene using KrF laser irradiation

2018 ◽  
Vol 428 ◽  
pp. 94-97 ◽  
Author(s):  
Somayeh Mortazavi ◽  
Mahmoud Mollabashi ◽  
S. Ismat Shah
Keyword(s):  
Laser Irradiation ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Krf Laser

Comparative study of electron transfer on various graphene-metallic contacts

2019 ◽  
Vol 33 (31) ◽  
pp. 1950384
Author(s):  
Di Lu ◽  
Yu-E Yang ◽  
Weichun Zhang ◽  
Caixia Wang ◽  
Jining Fang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Layer ◽  
Annealing Treatment ◽  
Single Layer Graphene ◽  
Strain Effect ◽  
Graphene Surface ◽  
Layer Graphene ◽  
Metallic Contacts ◽  
Nonuniform Strain ◽  
Main Factor

We have investigated Raman spectra of the G and 2D lines of a single-layer graphene (SLG) with metallic contacts. The shift of the G and 2D lines is correlated to two different factors. Before performing annealing treatment or annealing under low temperature, the electron transfer on graphene surface is dominated by nonuniform strain effect. As the annealing treatment is enhanced, however, a suitable annealing treatment can eliminate the nonuniform strain effect where the relative work function (WF) between graphene and metal becomes a main factor to determine electronic transfer. Moreover, it is confirmed that the optimized annealing treatment can also decrease effectively the structural defect and induced disorder in graphene due to metallic contacts.

scholarly journals Millisecond lattice gasification for high-density CO2- and O2-sieving nanopores in single-layer graphene

2021 ◽  
Vol 7 (9) ◽  
pp. eabf0116
Author(s):  
Shiqi Huang ◽  
Shaoxian Li ◽  
Luis Francisco Villalobos ◽  
Mostapha Dakhchoune ◽  
Marina Micari ◽  
...  
Keyword(s):  
Single Layer ◽  
High Density ◽  
Single Layer Graphene ◽  
Pore Density ◽  
Vacancy Defects ◽  
Carbon Gasification ◽  
Layer Graphene ◽  
Gas Molecules ◽  
Good Agreement

Etching single-layer graphene to incorporate a high pore density with sub-angstrom precision in molecular differentiation is critical to realize the promising high-flux separation of similar-sized gas molecules, e.g., CO2 from N2. However, rapid etching kinetics needed to achieve the high pore density is challenging to control for such precision. Here, we report a millisecond carbon gasification chemistry incorporating high density (>1012 cm−2) of functional oxygen clusters that then evolve in CO2-sieving vacancy defects under controlled and predictable gasification conditions. A statistical distribution of nanopore lattice isomers is observed, in good agreement with the theoretical solution to the isomer cataloging problem. The gasification technique is scalable, and a centimeter-scale membrane is demonstrated. Last, molecular cutoff could be adjusted by 0.1 Å by in situ expansion of the vacancy defects in an O2 atmosphere. Large CO2 and O2 permeances (>10,000 and 1000 GPU, respectively) are demonstrated accompanying attractive CO2/N2 and O2/N2 selectivities.

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