Synthesis and characterization of CdO-doped nanocrystalline ZnO:TiO2-based H2S gas sensor

Synthesis of ZnO nanorods by spray pyrolysis for H2S gas sensor

“…The hydrogen sulfide is a toxic and malodorous gas often produced in coal, coal oil or natural gas manufacturing, gasoline, natural gases and sewage. Human exposures to H 2 S gas at the level higher than 250 ppm are likely to result in neurobehavioral toxicity and may even cause death [10]. Hence, monitor and control over traces of such hazardous gas has become extremely important.…”

Designing a reliable leak bio-detection system for natural gas pipelines

“…6; spectroscopic procedures [129][130][131][132][133][134][135][136][137][138][139][140][141] are undoubtedly the most common routes taken, along with chromatographic [142][143][144][145][146][147][148][149][150][151] and electrochemical [152][153][154][155][156][157][158] techniques. The KB (stage 22) also produced alternative detection methods [159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174][175][176][177], such as elemental...…”

“…This is particularly important when preparing low concentrations of the analyte, whereby losses through aerial oxidation or reaction with trace metal impurities (particularly copper [153,155]) can be significant. Notwithstanding, each sensor category bears along its own limitations that prohibit presently the development of field devices: spectroscopy cannot be used for direct quantitation as successful implementation of this approach still requires a degree of sample preparation [129][130][131][132][133][134][135][136][137][138][139][140]; the selectivity of electrochemical sensors remains an issue with other thiols (as mercaptans that are expected in the sample) and reducing agents [152][153][154][155][156][157][158]; chromatography requires column separation to compensate for the lack of selectivity with respect to other redox species [142][143][144][145][146][147]; solid state systems are generally susceptible to temperature and humidity fluctuations and typically offer less selectivity that other technologies [167][168][169][170][171][172][173][174].…”

Novel Sensing Approach for LPG Leakage Detection—Part II: Effects of Particle Size, Composition, and Coating Layer Thickness

“…Another popular method applied for sensing is doping increasing the conductivity [6][7][8][9]. Even though doping seems to a viable option, but the sensitivity of the sensor will gradually decrease once the extrinsic current caused due to the addition of dopants and intrinsic current within the sensor becomes equal.…”