Investigation of gas sensing properties of armchair graphene nanoribbons

Moradian, Rostam; Mohammadi, Yawar; Ghobadi, Nader

doi:10.1088/0953-8984/20/42/425211

Cited by 21 publications

(16 citation statements)

References 24 publications

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“…In recent years, much attention has been focused on nanoelectronic devices [1][2][3] and molecular gas adsorption on single-walled carbon nanotubes and graphene system surfaces [4][5][6][7][8][9][10][11][12][13]. Since gas adsorption by these systems could change their electronic properties, these properties could be used as a gas sensing property.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Electrical conductivity of hydrogenated armchair nanoribbon as a gas sensor using non-equilibrium Green's function method

Moradian

Nazeri

2012

Int Nano Lett

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RetractionThis article was mistakenly published twice. For this reason this duplicate article has now been retracted. For citation purposes please cite the original: http://www.inljournal.com/?_action=articleInfo&article=16 Abstract Nanosensing properties of hydrogenated edge armchair graphene nanoribbons (HAGNR) are investigated. Using non-equilibrium Green's function method in the tight-binding approach, the effects of hydrogen and oxygen adsorption on current-voltage (I-V) characteristics and also the electrical conductivity of these systems are calculated. We found that the I-V curves of these systems change by the adsorption of hydrogen or oxygen molecules. Also, we found that conductivity of these systems at low adsorption concentrations increases, while at high adsorption, concentrations decrease. This could be explained in terms of semiconducting or metallic properties of the adsorbed system which was obtained from electronic properties of our clean HAGNR system. On the other hand, the local density of states of some sites has a metallic behavior, and that of other sites has a semiconducting behavior. Note that our results are investigated at a fixed temperature T = 300 K, i.e., room temperature. By calibrating conductivity in terms of adsorbed gas molecules, one can make a gas nanosensor.

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Section: Introductionmentioning

confidence: 99%

Retracted: Electrical conductivity of hydrogenated armchair nanoribbon as a gas sensor using non-equilibrium Green's function method

Moradian

Nazeri

2012

Int Nano Lett

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“…In this paper the out-of-plane or transverse vibration of singlelayer graphene sheets (SLGSs) is considered. The vibration studies could be useful for graphene-based mass and/or gas sensors [6,14,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Transverse vibration of single-layer graphene sheets

Chowdhury¹,

Adhikari²,

Scarpa³

et al. 2011

J. Phys. D: Appl. Phys.

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We investigate the vibrational properties of zigzag and armchair single-layer graphene sheets (SLGSs) using the molecular mechanics (MM) approach. The natural frequencies of vibration and their associated intrinsic vibration modes are obtained. Vibrational analysis is performed with different chirality and boundary conditions. The simulations are carried out for three types of zigzag and armchair SLGS. The universal force field potential is used for the MM approach. The first four natural frequencies are obtained for increasing lengths. The results indicate that the natural frequencies decrease as the length increases. The results follow similar trends with results of previous studies for SLGS using a continuum structural mechanics approach. These results have shown the applicability of SLGSs as electromechanical resonators.

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“…The first-principles calculations and the results of simple tight-binding approximation show that all AGNRs with edge deformation are semiconducting with a finite band gap [24,25]. Due to the semiconducting feature of the AGNRs, their sensing properties were investigated recently, based on the tight-binding approximation [26,27] and the ab initio calculations [28]. By changing the values of hopping integrals and atomic on-site energies for simulating the gas adsorption on the edges of an AGNR and using the coherent potential approximation for studying the effect of finite concentration of gas molecules, the sensing properties of the AGNR were discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Modeling of gas adsorption on graphene nanoribbons

Saffarzadeh

2010

Journal of Applied Physics

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We present a theory to study gas molecules adsorption on armchair graphene nanoribbons (AGNRs) by applying the results of ab initio calculations to the single-band tight-binding approximation. In addition, the effect of edge states on the electronic properties of AGNR is included in the calculations. Under the assumption that the gas molecules adsorb on the ribbon sites with uniform probability distribution, the applicability of the method is examined for finite concentrations of adsorption of several simple gas molecules (CO, NO, CO2, NH3) on 10-AGNR. We show that the states contributed by the adsorbed CO and NO molecules are quite localized near the center of original band gap and suggest that the charge transport in such systems cannot be enhanced considerably, while CO2 and NH3 molecules adsorption acts as acceptor and donor, respectively. The results of this theory at low gas concentration are in good agreement with those obtained by density-functional theory calculations.

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Investigation of gas sensing properties of armchair graphene nanoribbons

Cited by 21 publications

References 24 publications

Retracted: Electrical conductivity of hydrogenated armchair nanoribbon as a gas sensor using non-equilibrium Green's function method

Retracted: Electrical conductivity of hydrogenated armchair nanoribbon as a gas sensor using non-equilibrium Green's function method

Transverse vibration of single-layer graphene sheets

Modeling of gas adsorption on graphene nanoribbons

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