A first-principles study of the adsorption mechanism of NO2 on monolayer antimonide phosphide: a highly sensitive and selective gas sensor

A NO2/SbP adsorption system with high adsorption energy (−0.876 eV) and charge transfer value (−0.83 e) is reported.

Monolayer Janus Te2Se-based gas sensor to detect SO2 and NOx: a first-principles study

In this study, the adsorption of gas molecules, such as O₂, NH₃, CO, CO₂, H₂O, NO_x (x = 1, 2) and SO₂, on Janus Te₂Se monolayer has been investigated by means of density functional theory (DFT) calculations.

Influence of the adsorption of toxic agents on the optical and electronic properties of B12N12 fullerene in the presence and absence of an external electric field

The interaction energies and optoelectronic properties of sarin (SF) and chlorosarin (SC) on the B₁₂N₁₂ with and without the presence of an electric field have been studied using density functional theory (DFT) calculations.

Theoretical study of methane adsorption and C─H bond activation over Fe-embedded graphene: Effect of external electric field

The effect of an external electric field (EF) on the methane adsorption and its activation on iron-embedded graphene (Fe-GPs) are investigated by using the M06-L density functional method. The EF is applied in the perpendicular direction to the graphene in the range of -0.015 to +0.015 a.u. with the interval of 0.005 a.u. The effects of EF on the adsorption, transition state and product complexes of the methane activation reaction are revealed. The binding energies of methane on Fe site in Fe-GPs are increased from -12.9 to -15.3, -18.1 and -21.5 kcal/mol for the negative EF of -0.005, -0.010 and -0.015, respectively. By applying positive EF, the activation barriers for methane activation are reduced in range of 3-8 kcal/mol (around 12-31%) and the reaction energies are more exothermic. The positive EF kinetically favors the reaction compared to the system without EF. The adsorption and activation of methane on Fe-GPs can be easily tuned by adjusting the external electric field for various applications. © 2019 Wiley Periodicals, Inc.

Two-Dimensional Nanomaterials for Gas Sensing Applications: The Role of Theoretical Calculations

Two-dimensional (2D) nanomaterials have attracted a large amount of attention regarding gas sensing applications, because of their high surface-to-volume ratio and unique chemical or physical gas adsorption capabilities. As an important research method, theoretical calculations have been massively applied in predicting the potentially excellent gas sensing properties of these 2D nanomaterials. In this review, we discuss the contributions of theoretical calculations in the study of the gas sensing properties of 2D nanomaterials. Firstly, we elaborate on the gas sensing mechanisms of 2D layered nanomaterials, such as the traditional charge transfer mechanism, and a standard for distinguishing between physical and chemical adsorption, from the perspective of theoretical calculations. Then, we describe how to conduct a theoretical analysis to explain or predict the gas sensing properties of 2D nanomaterials. Thirdly, we discuss three important methods that have been applied in order to improve the gas sensing properties, that is, defect functionalization (vacancy, edge, grain boundary, and doping), heterojunctions, and electric fields. Among these strategies, theoretical calculations play a very important role in explaining the mechanisms underlying the enhanced gas sensing properties. Finally, we summarize both the advantages and limitations of the theoretical calculations, and present perspectives for further research on the 2D nanomaterials-based gas sensors.

The effective adsorption and decomposition of N2O on Al-decorated graphene oxide under electric field

Al-decorated graphene oxide is expected to be a promising new candidate for N₂O decomposition with enhanced adsorption and easier decomposition process.

External electric field induced hydrogen storage/release on calcium-decorated single-layer and bilayer silicene

The appropriate F can be used to effectively enhance the hydrogen storage–release on the Ca–silicene system.