Three-Dimensional van der Waals Heterostructure-Based Nanocages as Supersensitive 3-Hydroxy-2-butanone Gas Sensors at Room Temperature

Abstract

3-Hydroxy-2-butanone is one of the biomarkers of Listeria monocytogenes, which is quite important for the intelligent detection of 3H-2B. However, it is still a challenge to fabricate sensing materials obtaining excellent sensitivity and selectivity under the ppb-level detection limit. Herein, a plasma-assisted synthetic approach was proposed for the construction of hierarchical nanostructures and the simultaneous loading of TAPP-COFs, which could reduce interlayer interaction and convert the metallized sites on the surface of predesigned porphyrin rings into quantum nanoparticles. These multichannel pathways of Co-TAPP-COFs@SnO 2 @ MWCNTs nanocages contributed to the gas adsorption and diffusion, thus enhancing the sensing behavior. The nanocages exhibited a highly specific sensing performance toward 3H-2B with the highest sensitivity (R a /R g = 100.9 to 0.5 ppm) in all reported sensing materials. The 3H-2B sensor presented outstanding long-term stability, and the detection limit was 100 ppb at room temperature. Furthermore, the synthesized materials were integrated into the sensing module connecting to an Internet of Things platform, providing rapid and real-time detection of 3H-2B. We also applied machine learning methods to analyze the nanocage-based sensors and found that the combined effects of modified sites on the heterointerfaces contributed to the improvement of the sensing performance.

Behind the gas sensors: revealing sensing mechanisms with advanced magnetic resonance technology

“…37 Other different types of defects have already been characterized by EPR spectroscopy, providing a new insight into gas sensing materials and the corresponding underlying sensing mechanisms (Table 3). [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54] Table 3 Summary of typical gas sensing materials and the corresponding EPR results…”

“…37 Other different types of defects have already been characterized by EPR spectroscopy, providing a new insight into gas sensing materials and the corresponding underlying sensing mechanisms (Table 3). 38–54…”

Effects of Plasma Treatment on the Surface and Photocatalytic Properties of Nanostructured SnO2–SiO2 Films

“…Herein, we study the effect of plasma treatment of tin dioxide films on their surface and photocatalytic properties, which are selected for analysis due to their close relationship with the adsorption and sensor functionalities. While such processing is frequently employed as a manufacturing operation to produce semiconductor devices [15][16][17][18], it has also been found that oxygen plasma treatment improves the performance of metal oxide gas sensors [13,19,20]. The analysis of literature sources also shows that plasma treatment leads to a significant improvement in the photocatalytic properties of semiconductor oxides.…”