NO Gas Sensor Using Graphene Ink and NNN'N'-Tetramethyl-p-phenylenediamine

Abstract

We propose a novel sensing film for nitric oxide (NO) gas detection using graphene ink and NNN'N'-tetramethyl-p-phenylenediamine (TMPD). This sensing film can be fabricated by a low-temperature annealing process at about 80°C, which is suitable for flexible gas sensors. The proposed sensing film was deposited on alumina and polyethylene terephthalate (PET) substrates, and resistive NO gas sensors were fabricated. These sensors were able to detect NO gas concentrations from 2 ppm to 10 ppm, and had sufficient NO gas selectivity, regardless of the substrate. The high-temperature annealing process of the sensing film increased the sensitivity to ammonia (NH₃) gas, and deteriorated NO gas selectivity.