A chemiresistive-potentiometric multivariate sensor for discriminative gas detection

Abstract

Highly efficient gas sensors able to detect and identify hazardous gases are crucial for numerous applications. Array of conventional single-output sensors is currently limited by problems including drift, large size, and high cost. Here, we report a sensor with multiple chemiresistive and potentiometric outputs for discriminative gas detection. Such sensor is applicable to a wide range of semiconducting electrodes and solid electrolytes, which allows to tailor and optimize the sensing pattern by tuning the material combination and conditions. The sensor performance is boosted by equipping a mixed-conducting perovskite electrode with reverse potentiometric polarity. A conceptual sensor with dual sensitive electrodes achieves superior three-dimensional (sub)ppm sensing and discrimination of humidity and seven hazardous gases (2-Ethylhexanol, ethanol, acetone, toluene, ammonia, carbon monoxide, and nitrogen dioxide), and enables accurate and early warning of fire hazards. Our findings offer possibilities to design simple, compact, inexpensive, and highly efficient multivariate gas sensors.

Enhanced Potentiometric Hydrogen Sensing Response Based on the Ba0.5Sr0.5Co1–yFeyO3–δ Electrode with Unusual Polarity

“…Ba x Sr 1– x Co 1– y Fe y O 3– δ (BSCF), an MIEC perovskite with a high rate of oxygen diffusion, has been widely studied for fuel cells, gas separation membranes, and electrocatalysis . The unusual potential polarity of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3– δ (BSCF5582), one of the most typical types of BSCF, to 2-ethylhexanol, ethanol, and other gases, was found previously . Such unique properties of BSCF5582 may be desirable for enhancing potentiometric hydrogen sensing.…”

“…19 The unusual potential polarity of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF5582), one of the most typical types of BSCF, to 2ethylhexanol, ethanol, and other gases, was found previously. 20 Such unique properties of BSCF5582 may be desirable for enhancing potentiometric hydrogen sensing. Nevertheless, the potentiometric hydrogen sensing performance of BSCF5582 is not clear yet.…”

Ultra-effective room temperature gas discrimination based on monolithic Pd@MOF-derived porous nanocomposites: an exclusive scheme with photoexcitation

“…15–17 Although higher-ordered sensing arrays may be a feasible solution for gas discrimination, the high cost and device size make it hard to meet the demands of miniaturization and large-scale manufacturing in practical applications. 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.…”

Detection of Volatile Organic Compounds through Spectroscopic Signatures in Nanoporous Fabry–Pérot Optical Microcavities

“…Further, the use of a high number of individual sensors configurated in arrays to enable selective detection of gases and accuracy increases the complexity, energy consumption, and size of the device. 15 The quest for achieving highdiscriminative efficiency sensing with a simple single-sensor design is, therefore, an unmet need.…”

“…It is possible to compensate for zero-drifts digitally with AI or sophisticated models; however, this compensatory approach puts a heavy load on the computing power and accuracy of the model, which in turn increases design and manufacturing costs. Further, the use of a high number of individual sensors configurated in arrays to enable selective detection of gases and accuracy increases the complexity, energy consumption, and size of the device . The quest for achieving high-discriminative efficiency sensing with a simple single-sensor design is, therefore, an unmet need.…”