Tin oxide gas sensor on tin oxide microheater for high-temperature methane sensing

Atmospheric Dependence of Thermoelectric Generation in SnO2 Thin Films with Different Intergranular Potential Barriers Utilized for Self-Powered H2S Sensor Fabrication

“…As a result, the magnitude of the chemiresistive sensitivity is a valid guideline for chemithermoelectric material selection. Polycrystalline stannic oxide is well known for strong chemiresistivity and has been intensely studied as the most industrially effective gas sensing material. , …”

“…Polycrystalline stannic oxide is well known for strong chemiresistivity and has been intensely studied as the most industrially effective gas sensing material. 43,44 For the experimental verifications of eqs 2 and 3, the electrical conductivity and SV measurements are carried out on four different SnO 2 thin film samples. The Arrhenius diagram of charge transport along each sample is plotted by resistance measurements in the 298 to 625 K temperature range; results for all samples are given in Figure 2a engineering for creating polycrystalline materials with taller, but more atmosphere-sensitive, energy barriers can result in materials with stronger CTE effects.…”

A Review of Methane Gas Detection Sensors: Recent Developments and Future Perspectives

“…It was experimentally determined that the sensitivity of the sensor to methane depended on the Pt content of the gas-sensitive layer, which can be explained by the influence of the catalytic oxidation of methane that occurs on the surface of the sensor. Moalaghi et al [82] developed a dopant-free SnO2 methane sensor, heated using a 10 micron-thick microheater SMO sensors are used for a wide range of applications because they are inexpensive compared to other sensing technologies, lightweight and robust [76]. In addition, SMO sensors have long lifespans and are resistant to poisoning [73].…”

“…It was experimentally determined that the sensitivity of the sensor to methane depended on the Pt content of the gas-sensitive layer, which can be explained by the influence of the catalytic oxidation of methane that occurs on the surface of the sensor. Moalaghi et al [82] developed a dopant-free SnO 2 methane sensor, heated using a 10 micron-thick microheater which can operate at temperatures as high as 850 • C, sufficient for the spontaneous pyrolysis of methane. The sensor was able to selectively sense methane in atmospheres contaminated with CO and H 2 , with both the response and recovery time being approximately 10 s and the methane detection limit being 50 ppm-m. Shaalan et al [83] investigated the morphology and gas sensing characteristics of Co 3 O 4 nanoparticles prepared using microwave irradiation.…”

Free-standing, thin-film sensors for the trace detection of explosives

“…Unfortunately, the fabrication process for these systems can be relatively complex and require time and resources to replicate thus limiting their availability. Interestingly, tin oxide microheaters employing tin oxide sensing materials have been fabricated that displayed remarkably fast response and recovery times (~ 10 s respectively) for the detection of methane 34 . Ultimately, these sensors required extremely high operating temperatures > 700 °C for optimal performance.…”