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Article Dans Une Revue Chemosensors Année : 2022

Gas Sensors Based on Exfoliated g-C3N4 for CO2 Detection


We report on the investigation of graphitic carbon nitride (g-C3N4) for carbon dioxide (CO2) sensor applications. g-C3N4 is prepared by the thermal polycondensation of thiourea and sprayed onto a substrate with interdigitated electrodes. The resulting sensor device exhibited a high sensitivity to CO2 molecules of ~200 ppm, a high responsivity of ~730 ms at 40 °C and a full recovery time of 36 s. Furthermore, a set of various characterization measurements demonstrated the excellent stability of both the g-C3N4 nanosheets and the fabricated gas sensor device. Meanwhile, density functional theory (DFT) calculations for the bulk and monolayer models, based on tri-s-triazine, revealed the optoelectronic properties of g-C3N4 and the interaction energy with CO2, which is evaluated at −0.59 eV. This value indicates the very good affinity of g-C3N4 nanosheets to CO2 molecules. Our findings shed light on the potential for g-C3N4 to be used for the development of high-performing gas sensor devices.

Dates et versions

hal-03889715 , version 1 (08-12-2022)



Ahmed Kotbi, Manal Benyoussef, El Mostafa Ressami, Michael Lejeune, Brahim Lakssir, et al.. Gas Sensors Based on Exfoliated g-C3N4 for CO2 Detection. Chemosensors, 2022, 10 (11), pp.470. ⟨10.3390/chemosensors10110470⟩. ⟨hal-03889715⟩
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