Highly responsive and swift recovery triethylamine gas sensor based on NiCo2O4-ZnO p-n heterojunction

• Published in: Sensors and actuators. B, Chemical Chemical, 2024-07, Vol.410, p.135666, Article 135666
• Main Authors: Yue, Qing, Liu, Tao, Mu, Yang, Chen, Xingtai, Yin, Xi-Tao
• Format: Article
• Language: English
• Subjects: Gas sensor; Heterojunction; NiCo2O4-ZnO; Triethylamine
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2024.135666

In the detection of food freshness and chemical production, live tracking of the concentration of triethylamine gas is both essential and challenging. The NiCo2O4-ZnO triethylamine gas sensor prepared with two-step hydrothermal method proposed in this study exhibits a response of TEA at the ideal operational temperature of 250 °C and a response/recovery time of 69 s/2 s. Compared to the single ZnO sensor, the response value is increased by a factor of 8.47, the recovery time is reduced to 1/8, and good selectivity (the response for TEA is 4.75 times higher than others), repeatability, and long-term stability (40 days) are demonstrated. Notably, research on fabricating TEA gas sensors by constructing p-n heterojunctions using NiCo2O4 and ZnO composites is currently lacking. The enhancement of the gas-sensitive properties of the composites is the result of a combination of factors such as increased specific surface area (18.18 m2/g−1) and pore size (29.84 nm), the formation of p-n heterojunctions, and the synergistic effect between the two materials. The excellent TEA sensitivity exhibited by the NiCo2O4-ZnO composites holds considerable practical application potential in triethylamine gas sensors. •There is no such study in the existing literature.•This TEA gas sensor has a high response value and swift recovery time.•This sensor constructs a p-n heterojunction of NiCo2O4-ZnO composites.