خواص حسگري سيستم‌هاي دوبعدي هيدرات بروفين و سيليسين

In this study, the plasmonic response of monolayer silicene an‎d borophene hydride was comprehensively investigated under the influence of mechanical strain an‎d gas molecule adsorption. Mechanical strains were applied along the a an‎d b directions, as well as biaxially, to analyze the effects of lattice modifications on plasmon energy an‎d collective electron behavior. The results showed that even very small strains, in the range of 0.001 to 0.01, lead to significant shifts in plasmon energy; for example, the plasmon energy of silicene decreased from 8.17eV in the unstrained state to 8.101eV under a 0.01 biaxial strain. These changes indicate the extreme sensitivity of the two-dimensional lattice to structural variations an‎d highlight the crucial role of the p orbital in enhancing collective oscillations an‎d reducing plasmon frequency. Analysis of collective electron behavior revealed that mechanical strain increases the electron density in active regions an‎d amplifies the oscillation amplitude, while reducing the energy required to excite these modes; this feature emphasizes the potential of silicene as an ultra-sensitive pressure sensor. The effect of gas adsorption on borophene hydride was also examined separately. Adsorption of CO2 caused a blue shift in plasmon energy to 10.78eV, whereas H2s an‎d SO2 produced different effects, including slight reductions in energy an‎d changes in the plasmon peak intensity. Partial density of states (PDOS) analysis indicated that the p orbital contributes most significantly to the formation of the Dirac ring an‎d the plasmonic response, with plasmon energy variations directly correlated to changes in the electron density of this orbital. This finding confirms the role of charge-transfer mechanisms an‎d molecular dipole effects in the sensing behavior. Overall, the results demonstrate that plasmon energy is a highly sensitive indicator for detecting mechanical an‎d chemical changes in two-dimensional materials. The combination of mechanical strain an‎d gas adsorption allows the detection of subtle variations in lattice structure an‎d surface environment, with plasmonic behavior directly linked to orbital distribution an‎d electron density changes. Therefore, borophene hydride an‎d silicene, as stable an‎d highly sensitive two-dimensional materials, represent ideal can‎didates for the development of ultra-sensitive pressure an‎d gas sensors at the nanoscale, providing a solid foundation for the design an‎d optimization of advanced nanodevices an‎d optoelectronic applications.

اسماعيل عبدالحسيني سارسري

مجتبي اعلائي

محمد مرداني كراني , فرهاد فضيله , زهرا نوربخش