Advantages of Slow Sensing for Ambient Monitoring: A Practical Perspective

Abstract

Air pollution is a ubiquitous threat, affecting 99% of the global populace and causing millions of premature deaths annually. Monitoring ambient air quality is essential, aiding policymakers and environmental agencies in timely interventions. This study delves into the advantages of slower gas sensors over their ultrafast counterparts, with a keen focus on their practicality in real-world scenarios. Slow sensors offer accurate time-averaged exposure assessments, harmonizing with established regulatory benchmarks. Their heightened precision and reliability, complemented by their cost-effectiveness, render them eminently suitable for large-scale deployment. The slow sensing ensures compatibility with regulations, fostering robust risk management practices. In contrast, ultrafast sensors, while claiming rapid detection, despite touting swift detection capabilities, grapple with formidable challenges. The sensitivity of ultrafast sensors to uncontrolled atmospheric effects, fluctuations in pressure, rapid response times, and uniform gas dispersion poses significant hurdles to their reliability. Addressing these issues assumes paramount significance in upholding the integrity of air quality assessments.

Hierarchical Nanoheterostructure of HFIP-Grafted α-Fe2O3@Multiwall Carbon Nanotubes as High-Performance Chemiresistive Sensors for Nerve Agents

“…The fitting line can be expressed as Y = 0.01235X + 4.56854, where the fitting coefficient R 2 was 0.9951, indicating the high linearity. It was calculated that the LOD and LOQ of the HFIP-α-Fe 2 O 3 @MWCNT sensor are 63.92 ppb and 213.07 ppb, respectively [55].…”

“…The fitting line can be expressed as Y = 0.01235X + 4.56854, where the fitting coefficient R 2 was 0.9951, indicating the high linearity. It was calculated that the LOD and LOQ of the HFIP-α-Fe2O3@MWCNT sensor are 63.92 ppb and 213.07 ppb, respectively [55]. Response time and recovery time reflect the speed of response and recovery of the gas sensor to the detected gas and are important factors in examining the performance of the sensor.…”