Ultrasensitive NO2 gas sensor with insignificant NH3-interference based on a few-layered mesoporous graphene

• DOI: 10.1016/j.snb.2021.129657
• Publication Date: 2021-02-16T06:53:35Z
• Authors: Daniel Matatagui; Jesús López-Sánchez; Alvaro Peña; Aída Serrano; Adolfo del Campo; Oscar Rodríguez d...; Noemí Carmona; Elena Navarro; Pilar Marín; María del Carmen ...
• Keywords: gas selectivity; Física de materiales; Sub-ppm sensitivity; 02 engineering and technology; High-energy ball milling; 538.9; Raman-spectroscopy; NO_(2) gas sensors; NO2 gas sensors; few-layered mesoporous graphene; high-energy ball milling; 0210 nano-technology; Few-layered mesoporous graphene; Gas selectivity; 2211 Física del Estado Sólido

The authors acknowledge the Spanish Ministry of Science and Innovation for financing the projects RTI2018-095856-B-C22 (AEI/ FEDER), RTI2018-095856-B-C21 (AEI/FEDER), RTI2018-095303-AC52, MAT2015-65445-C2-1-R, MAT2017-86450-C4-1-R, MAT2015- 67557-C2-1-P, and PIE 2010-6OE-013. The Comunidad de Madrid by S2018/NMT-4321. D. M. acknowledges the financial support from the Fundacion ´ General CSIC via Programa ComFuturo. A. S. acknowledges the financial support from the Comunidad de Madrid for an “Atraccion ´ de Talento Investigador” contract (no. 2017-t2/IND5395).<br/>Few-layered mesoporous graphene (FLMG) is employed as a sensing material to develop an innovative and high-sensitivity room temperature NO 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 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 NH is rather poor as well (∼1.5 % at 50 ppm).<br/>9 páginas, 6 figuras color.<br/>