SnO2-based thick-film-resistive sensor for H2S detection in the concentration range of 1–10 mg m−3

Highly sensitive H2S sensor based on template-synthesized CuO nanowires

“…Dry air was used as the carrier gas to obtain H 2 S mixtures with concentrations ranging from 10 ppb to 1000 ppb, which was regulated by a computer-controlled gas mixing system (S-4000, Environics Inc., Tolland, CT, USA). All experiments were carried out using a flow rate at 1.8 L min 21 . In a typical testing cycle, a stable baseline was first obtained by flashing dry air through the chamber for one hour before experiments, then the sample was exposed to H 2 S for 10 min, followed by dry air purging of 15 min to allow the sensor to recover.…”

Surface Characterization and the Gas Response of a Mixed, Fe2O3Fe2(MoO4)3, Oxide to Low Concentrations of H2S in Air

“…Effective gas sensing mechanisms require a high coverage of reactive oxide species at the surface of the grains [27], and the increase of the conductivity in the presence of H 2 S may be explained by the reaction in Equation 3 [28,29] Thus, it can be proposed that the interaction of H 2 S with surface leads to the formation of the S 2À ions (Eq. 2), which react with the reversibly adsorbed SO 2 molecules and those from the gas phase (Eq.…”

Hydrocarbon and Sulfur Sensors for Sofc Systems

“…The information provided by these sensors could be used to suppress, or minimize, the cokeformation attributed to the dissociation of lighter HCs (on the anode) by varying the O 2 or H 2 O content in the reforming process. Similarly, the use of sulfur sensors before and after the [10][11][12][13][14][15]. Again, the temperature and concentration range of these techniques are quite low and they too operate in ambient air.…”