Nanocrystalline LaCoO3 modified by Ag nanoparticles with improved sensitivity to H2S

Enhanced gas sensing performance of perovskite YFe1−xMnxO3 by doping manganese ions

“…At higher concentrations, the response increases more slowly as the concentration increases, which shows that the adsorption of target molecules on the surface of sensing materials gradually reaches saturation. The linear relationship shows that the adsorption of H 2 O 2 and CH 2 O vapors on YFe 0.95 Mn 0.05 O 3 has not yet reached saturation in the low concentration range. According to the tting results in Fig.…”

“…Perovskites have a great effect in many domains, such as gas sensors. [1][2][3][4] Recently, a variety of perovskite structures based on ABO 3 -type composites have been used as gas sensors due to their high stability and also their characteristics of sensitivity and selectivity. [4][5][6] Perovskite BaSnO 3 obtained from a simple wet chemical route was calcined at different temperatures and the gas sensing performance was studied in the presence of O 2 , CO and NO 2 as a function of the temperature.…”

“…7 Traversa fabricated the thick lms of LaFeO 3 and SmFeO 3 by screen-printing technology on alumina substrates with comb-type Au electrodes. The effect of temperature and humidity on the gas sensing performance of LaFeO 3 and SmFeO 3 to NO 2 and CO were studied and the presence of humidity does not affect the detection of NO 2 and CO. 8 The sensing properties of SrTiO 3 were regulated by the annealing temperature due to the change of the grain size of SrTiO 3 . The optimal relative resistance (R nitrogen /R 20% oxygen ) value of 6.35 is obtained for the synthesized SrTiO 3 sample annealed at 400 C and operating at 40 C, which is much lower than that for the conventional metal oxide semiconducting oxygen gas sensors (300-500 C).…”

“…The role of Ag nanoparticles in the selective sensitivity of Ag/LaCoO 3 composites to H 2 S gas were unveiled using in situ infrared spectroscopy. 3 Mandayo prepared BaTiO 3 -CuO lms and annealed at different temperatures in order to test their electrical behavior by means of impedance measurements under different CO 2 concentrations (0-2000 ppm). Pt and Ag are tested as electrode materials and the inuence of Ag as surface and multilayer additive for sensing response enhancement is also studied.…”

“…14 Among these perovskites, yttrium orthoferrite (YFeO 3 ) has attracted the attention of researchers due to their excellent magnetic, magneto-optical, physical and chemical properties originated by their ionic and electronic defects as well as structure distortions. [15][16][17] To the best of our knowledge, most previous studies on YFeO 3 have been focused on its photoluminescence, catalysts and magnetic properties, [18][19][20][21][22] but few have been reported on gas sensing. In terms of actual sensing requirements, controlling and monitoring the toxic, inammable and explosive gases, such as formaldehyde (CH 2 O), ethanol (C 2 H 6 O) and hydrogen peroxide (H 2 O 2 ), is important for industrial production, indoor life and public safety.…”