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Building Feedback-Regulation System Through Atomic Design for Highly Active SO2 Sensing
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Building Feedback-Regulation System Through Atomic Design for Highly Active SO2 Sensing
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Journal Article
Building Feedback-Regulation System Through Atomic Design for Highly Active SO2 Sensing
2024
Overview
HighlightsFeedback-regulation system is established between single Pt sites and MoS2 supportsThe Pt1-MoS2-def can expand the electron transfer path from single Pt sites to whole Pt-MoS2 supports in SO2 gas atmosphere.The Pt1-MoS2-def sensors exhibit high SO2 responses and extremely low limit of detection (3.14% to 500 ppb SO2) at room temperature.The Pt1-MoS2-def sensors array can realize real-time monitoring of SO2 for plant growth.Reasonably constructing an atomic interface is pronouncedly essential for surface-related gas-sensing reaction. Herein, we present an ingenious feedback-regulation system by changing the interactional mode between single Pt atoms and adjacent S species for high-efficiency SO2 sensing. We found that the single Pt sites on the MoS2 surface can induce easier volatilization of adjacent S species to activate the whole inert S plane. Reversely, the activated S species can provide a feedback role in tailoring the antibonding-orbital electronic occupancy state of Pt atoms, thus creating a combined system involving S vacancy-assisted single Pt sites (Pt-Vs) to synergistically improve the adsorption ability of SO2 gas molecules. Furthermore, in situ Raman, ex situ X-ray photoelectron spectroscopy testing and density functional theory analysis demonstrate the intact feedback-regulation system can expand the electron transfer path from single Pt sites to whole Pt-MoS2 supports in SO2 gas atmosphere. Equipped with wireless-sensing modules, the final Pt1-MoS2-def sensors array can further realize real-time monitoring of SO2 levels and cloud-data storage for plant growth. Such a fundamental understanding of the intrinsic link between atomic interface and sensing mechanism is thus expected to broaden the rational design of highly effective gas sensors.
Publisher
Springer Nature B.V
