scholarly journals Theoretical Study on Anisotropy and Ultra-low Thermal Conductance of Porous Graphene nanoribbons

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
◽  
Keyword(s):  
Theoretical Study ◽  
Graphene Nanoribbons ◽  
Thermal Conductance ◽  
Porous Graphene

scholarly journals Theoretical study of anisotropy and ultra-low thermal conductance of porous graphene nanoribbons

2022 ◽  
Vol 71 (2) ◽  
pp. 027803-027803
Author(s):  
Wu Cheng-Wei ◽  
◽  
Ren Xue ◽  
Zhou Wu-Xing ◽  
Xie Guo-Feng ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Graphene Nanoribbons ◽  
Thermal Conductance ◽  
Porous Graphene

Electrochemical and theoretical study of novel functional porous graphene aerogel-supported Sm2O3 nanoparticles for supercapacitor applications

2020 ◽  
Vol 24 (3) ◽  
pp. 571-582 ◽  
Author(s):  
Mohammad Mazloum-Ardakani ◽  
Fariba Sabaghian ◽  
Hamidreza Naderi ◽  
Azra Ebadi ◽  
Hamideh Mohammadian-Sarcheshmeh
Keyword(s):  
Theoretical Study ◽  
Graphene Aerogel ◽  
Porous Graphene ◽  
Supercapacitor Applications

Bottom-up Synthesis of Nitrogen-Doped Porous Graphene Nanoribbons

2020 ◽  
Vol 142 (29) ◽  
pp. 12568-12573 ◽  
Author(s):  
Rémy Pawlak ◽  
Xunshan Liu ◽  
Silviya Ninova ◽  
Philipp D’Astolfo ◽  
Carl Drechsel ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Bottom Up ◽  
Nitrogen Doped ◽  
Porous Graphene

Strained effects on the thermal conductance of flexural and in-plane modes in graphene nanoribbons

2019 ◽  
Vol 33 (31) ◽  
pp. 1950383
Author(s):  
Bengang Bao ◽  
Gao-Hua Liao ◽  
Jun He ◽  
Chang-Ning Pan
Keyword(s):  
Transport Properties ◽  
Phonon Mode ◽  
Graphene Nanoribbons ◽  
Thermal Conductance ◽  
Low Frequency ◽  
Phonon Transport ◽  
Frequency Region ◽  
Function Approach ◽  
Non Equilibrium Green’S Function ◽  
Plane Mode

Ballistic thermal transport properties in graphene nanoribbon modulated with strain are investigated by non-equilibrium Green’s function approach. The results show that the strain can suppress the phonon transport of flexural phonon mode (FPM) and enhance the phonon transport of in-plane mode (IPM) in low-frequency region, leading to the reduction in the thermal conductance of FPM and the enhancement in the thermal conductance of IPM. The total thermal conductance is decreased by strain as the reduction in the thermal conductance of FPM overcomes the enhancement in the thermal conductance of IPM.

scholarly journals Impurity Substitution Enhances Thermoelectric Figure of Merit in Zigzag Graphene Nanoribbons

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Saeideh Ramezani Akbarabadi ◽  
Mojtaba Madadi Asl
Keyword(s):  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Density Functional ◽  
Graphene Nanoribbons ◽  
Electrical Conductance ◽  
Thermal Conductance ◽  
Simultaneous Increase ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Zigzag Graphene Nanoribbons

The thermoelectric properties of zigzag graphene nanoribbons (ZGNRs) are sensitive to chemical modification. In this study, we employed density functional theory (DFT) combined with the nonequilibrium green’s function (NEGF) formalism to investigate the thermoelectric properties of a ZGNR system by impurity substitution of single and double nitrogen (N) atoms into the edge of the nanoribbon. N-doping changes the electronic transmission probability near the Fermi energy and suppresses the phononic transmission. This results in a modified electrical conductance, thermal conductance, and thermopower. Ultimately, simultaneous increase of the thermopower and suppression of the electron and phonon contributions to the thermal conductance leads to the significant enhancement of the figure of merit in the perturbed (i.e., doped) system compared to the unperturbed (i.e., nondoped) system. Increasing the number of dopants not only changes the nature of transport and the sign of thermopower but also further suppresses the electron and phonon contributions to the thermal conductance, resulting in an enhanced thermoelectric figure of merit. Our results may be relevant for the development of ZGNR devices with enhanced thermoelectric efficiency.

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