Journal
APPLIED SURFACE SCIENCE
Volume 514, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145866
Keywords
Chemisorption/physisorption; Adsorbates on surfaces; DFT; Electronic transport in graphene; Calculations of density of states; Graphene
Categories
Funding
- Emirati Center for Energy and Environmental Research at UAEU [31R145, 31R216]
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The adsorption and gas-sensing properties of B/N edge-doped graphene nano-ribbons (GNRs) are investigated using state-of-the-art computational technique, which is based on a combination of density-functional theory (DFT) and non-equilibrium Green's functions (NEGF) formalism. First, the assessment of the effects dopants' positions, with respect to edges of GNR, on the transport properties has revealed that the bilaterally B/N edge-doping of GNR would yield negative-differential resistance (NDR) IV-characteristics, due to the back-scattering events. Then, the double-edge-doped GNR:B and GNR:N were used to study the gas-sensing properties. The results of adsorption tests show that chemisorption processes can be attained for NO2 and O-2 molecules on GNR:B and SO3 molecule on GNR:N. Furthermore, the results of calculations of transport properties show that the chemisorption processes of these molecules can yield enormous rectifications to the IV-characteristics to sweep the NDR behaviors and should consequently yield large sensors responses in GNR-based devices. Comparison to many other gases is performed and it is concluded that edge-doping in both GNR:B and GNR:N would yield exceptionally high selectivity towards detecting toxic NO2 and SO3 gases, respectively. The combined GNR:B- and GNR:N-based sensors are suggested to be used as gas-sensor and alarm-sensor for NO2 gas, respectively. Our theoretical findings are corroborated with available experimental data.
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