期刊
APPLIED SURFACE SCIENCE
卷 514, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145866
关键词
Chemisorption/physisorption; Adsorbates on surfaces; DFT; Electronic transport in graphene; Calculations of density of states; Graphene
类别
资金
- Emirati Center for Energy and Environmental Research at UAEU [31R145, 31R216]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据