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oai:docta.ucm.es:20.500.14352/916432025-09-02T15:09:04Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Matatagui Cruz, Daniel author López Sánchez, Jesús author Peña Moreno, Álvaro author Serrano, Aída author Del Campo, Adolfo author Rodríguez De La Fuente, Óscar author Carmona Tejero, Noemí author Navarro Palma, Elena author Marín Palacios, María Pilar author Horrillo, María del Carmen author 2021 Few-layered mesoporous graphene (FLMG) is employed as a sensing material to develop an innovative and high-sensitivity room temperature NO_(2) sensor through a simple manufacturing process. For this purpose, sensing material is optimized at 100 min by a high-energy milling process where natural graphite is used as a precursor: it is an inexpensive, sustainable and suitable active material. The large number of defects created and the enhanced degree of mesoporosity produced during the milling process determine the physical principles of operation of the designed device. NO_(2) gas sensing tests reveal an improved and selective performance with a change in resistance of ∼16 % at 0.5 ppm under ultraviolet photo-activation, establishing a detection limit around ∼25 ppb. Interestingly, the response of the developed sensor to humidity is independent in the measured range (0–33 % relative humidity at 25 °C) and the dependency to the presence of NH3 is rather poor as well (∼1.5 % at 50 ppm). Matatagui, D., López-Sánchez, J., Peña, A., Serrano, A., Del Campo, A., De La Fuente, O.R., Carmona, N., Navarro, E., Marín, P., Del Carmen Horrillo, M.: Ultrasensitive NO2 gas sensor with insignificant NH3-interference based on a few-layered mesoporous graphene. Sensors and Actuators B: Chemical. 335, 129657 (2021). https://doi.org/10.1016/j.snb.2021.129657 10.1016/j.snb.2021.129657 https://hdl.handle.net/20.500.14352/91643 0925-4005 https://doi.org/10.1016/j.snb.2021.129657 https://www.sciencedirect.com/science/article/pii/S0925400521002252 Ultrasensitive NO_(2 )gas sensor with insignificant NH3-interference based on a few-layered mesoporous graphene