Electrical identification of SF6 breakdown by-products using 2D carbon allotrope nanodevices
Nenhuma Miniatura disponível
Data
2025-10-16
Autores
Spalenza, Pedro Elias Priori
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal do Espírito Santo
Resumo
Sulfur hexafluoride (SF6) is widely employed as an insulating gas in the power industry due to its exceptional dielectric properties. However, it inevitably decomposes into hazardous by-products during prolonged operation. Detecting these decomposition products is crucial for assessing equipment health and preventing insulation failures. Two-dimensional (2D) carbon-based materials have recently emerged as promising platforms for gas sensing. Nonetheless, their inherently weak van der Waals interactions with SF6 by-products often require surface functionalization, potentially compromising device reusability. Here, we propose four pristine 2D carbon allotropes- Net-graphene, Graphene+, T-graphene, and Biphenylene- as field-effect nanosensors for SF6 decomposition products. Using density functional theory combined with non-equilibrium Green’s function calculations, we examined the physisorption of H2S, SO2, SO2F2, and SOF2 on these materials. Although adsorption is dominated by van der Waals forces, an appropriate gate voltage shifts the chemical potential into sensitive regions of the transmission spectrum, enabling both detection and unambiguous identification of target molecules. In particular, a Net-graphene device can distinguish SO2 and H2S with high specificity, negligible cross-selectivity to O2 and H2O, and ultrafast recovery times. Moreover, Graphene+ uniquely detects both SO2 and SOF2 at a single gate voltage. Overall, the combination of intrinsic stability, low-power operation, rapid recovery, high sensitivity, and strong selectivity positions Net-graphene and Graphene+ as leading candidates for real-time, field-effect-based monitoring of SF6 decomposition products in power-industry applications.
Descrição
Palavras-chave
Net-graphene , Graphene+ , T-graphene , Biphenylene , SF6