Adsorption of gas molecules of CH₄, CO and H₂O on the vanadium dioxide monolayer: computational method and model

Abstract

Inspired by the recent use of two-dimensional nanomaterials as gas sensors, we used density functional theory calculations to study the adsorption of gas molecules (CH4, CO and H2O) on sandwich vanadium dioxide tablets. The results showed that of all these gases, only the CH4 gas molecule was the electron acceptor with significant charge transfer on the VO2 sheet. The adsorption energies of CH4, CO and H2O are −229.5 meV, −239.1 meV and −388.3 meV, respectively. We have also compared the adsorption energy of three different gas molecules on the VO2 surface, our calculation results show that when the three kinds of gases are adsorbed on the VO2 surface, the order of the surface adsorption energy is H2O > CO > CH4. It is also found that after adsorption of CH4, CO and H2O molecules, the electronic properties of VO2 sheet changed obviously. However, due to the strong adsorption of H2O molecule on VO2 sheet, it is difficult to desorption, which hinders its application in gas molecular sensors. The optical properties of VO2 sheet are further calculated. The absorption of CH4, CO and H2O molecules is introduced to red-shift the dielectric function of the thin film, which indicates that the optical properties of the thin film have changed significantly. According to the change of optical properties of VO2 sheet before and after molecular adsorption, VO2 can be used as a highly selective optical gas sensor for CH4, CO and H2O detection. These results provide a new approach for the potential application of VO2 based optical gas sensors.

Ferromagnetic transition-metal doped ɛ-phosphorene

“…Since its first successful fabrication, black phosphorene (αphosphorene) has garnered significant interest for a range of applications (see the reviews and references therein) [1][2][3][4]. Phosphorene's remarkable electrical and magnetic properties [5][6][7][8][9] make it a promising candidate for use in electronics, spintronics, and gas sensors [6,8,[10][11][12][13][14]. However, the primary challenge for practical applications of 2D black phosphorus is its poor ambient stability, necessitating encapsulation by inert 2D materials such as h-BN [14,15].…”

F+ center exchange mechanism and magnetocrystalline anisotropy in Ni-doped 3C-SiC

“…Long Lin et al showed through theoretical studies that co-doping Mn and Co atoms in the wideband gap semiconductor SnO 2 stabilizes the ferromagnetic state [15,16]. Theoretical studies also show that dilute magnetic systems could be used for gas sensing applications [17][18][19].…”