Chemiresistive Gas Sensors Based on Highly Permeable Sn‐Doped Bismuth Subcarbonate Microspheres: Facile Synthesis, Sensing Performance, and Mechanism Study
Xin‐Yu Huang,
Keyu Chen,
Wenhe Xie
et al.
Abstract:Acetic acid (CH3COOH) detection with high selectivity at low temperatures is significant due to its wide applications in the chemical, medical, and catering industries. Chemiresistive gas sensors based on metal oxide semiconductors (MOSs) are widely used in detecting various gases, but it is necessary to develop MOSs with novel nanostructures to enhance gas‐sensing performance. Herein, a series of bismuth subcarbonate (Bi2O2CO3, abbreviated as BCO) microspheres with highly permeable lamellar structure and tuna… Show more
“…44 For SMO gas sensors, it is recognized that the sensing signal of target gases primarily involves resistance fluctuations, which further hinges on variations in carrier concentration. 45 Under atmospheric conditions, oxygen molecules were adsorbed onto the sensing material's surface and captured electrons from the conduction band, leading to the formation of adsorbed oxygen species (Fig. S24, ESI†).…”
The real-time monitoring of volatile sulfur compounds is indispensable; however, it continues to pose a significant challenge due to issues such as limited performance towards parts-per-billion (ppb)-level gas. Herein, a...
“…44 For SMO gas sensors, it is recognized that the sensing signal of target gases primarily involves resistance fluctuations, which further hinges on variations in carrier concentration. 45 Under atmospheric conditions, oxygen molecules were adsorbed onto the sensing material's surface and captured electrons from the conduction band, leading to the formation of adsorbed oxygen species (Fig. S24, ESI†).…”
The real-time monitoring of volatile sulfur compounds is indispensable; however, it continues to pose a significant challenge due to issues such as limited performance towards parts-per-billion (ppb)-level gas. Herein, a...
“…18 With the development of nanotechnology, sensitivity is no longer a major concern for sensors, which can be achieved by either modified nanostructures or surface functionalization. 19–21 Selectivity, especially the unique selectivity gas sensing of a monolithic sensor at room temperature, is still a great challenge but imperative for chemiresistive sensors.…”
A high-selectivity reversed response to H2 is discovered from the monolithic MOF-derived nanocomposites under UV photoexcitation at room-temperature, which provides a feasible reference for the ultra-effective gas discrimination at room temperature.
“…Gas sensing involves the catalysis of gas molecules, and the structure and surface state of the sensing materials have a significant effect on their catalytic activity and gas sensing performance. 11,12 Improving gas sensing performance involves two main aspects: the utilization rate of the gas sensing material and the functional modification of the material surface.…”
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