LaCoO₃-based sensors with high sensitivity to carbon monoxide

Abstract

LaCoO 3 -based sensors, as fabricated of LaCoO 3 nanoparticles of ∼82 nm, show a response of ∼279.86 toward CO at 500 °C, due to the high content of O 2 2-/Ospecies in LaCoO 3 .LaCoO3 nanoparticles with particle size of ∼82 nm was prepared by co-precipitation, and mesoporous LaCoO3 thick films with a thickness of ∼7 µm were fabricated by screen printing the nanoparticles on Al2O3 substrates. The CO sensing properties of the LaCoO3 thick films were characterized in the temperature range of 100 to 550 °C. Under 5000 ppm CO at 500 °C, the thick film sensor achieved a high sensing response of ∼279.86, with response and recovery periods of 181 and 311 s, respectively. Under 25 ppm CO at 500 °C, a reasonable response of 1.04 was also achieved. Moreover, the sensor demonstrated reliable dynamic response-and-recovery at a temperature as low as 100 °C, therefore, LaCoO3 is very promising for CO sensing at low temperatures. The high response to CO could be ascribed to the high content of O2 2-/Ospecies in LaCoO3.

Spray-pyrolysis deposited La1−xSrxCoO3 thin films for potential non-volatile memory applications

“…All of them can plausibly assigned to the perovskite LSCO structure. In particular, rhombohedral LaMnO3 samples show peaks at 202, 490 and 611 cm -1 , which are quite close to our peaks at 202, 485 and 617 cm -1 , respectively [5]. Furthermore, the Raman peak at 522 cm -1 can be assigned to the Eg quadrupole mode [25].…”

“…Among other perovskite transition metal oxides, Sr doped LaCoO3 (LSCO) has gained considerable research interest, since it has been proposed for applications in fuel cells [1,2], oxygen penetration membranes [3,4], in gas sensing [5], and as electrodes in ferroelectric memory devices [6,7]. Very recently resistance switching (RS) behavior has been reported for LSCO [8,9] suggesting its possible application, to resistive random access memory devices (RRAMs).…”

Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites

“…Yet, this is not the case with LaCoO 3 and thus more research is required to shed light on and find the exact physical phenomenon responsible for such tremendous increase in stiffness of this material. LaCoO 3 based perovskites have many applications as sensors[47], oxygen separation membranes[48], and in energy applications such as cathode material in solid oxide fuel cells[49] or as a catalyst in heterogeneous combustion[50]. The results from the current study will contribute to the understanding of the non-linear ferroelastic behavior of mixed ionic electronic conducting ceramics under thermo-mechanical loading.ACKNOWLEDGEMENT Funding: This work was supported by the National Science Foundation [grant numbers: 0968911, 1030833, 0748364].…”

Novel UV Sensing and Photocatalytic Properties of DyCoO3

“…In recent years, cobalt-based perovskites of formula LnCoO 3 , where Ln is a rare earth element, have attracted considerable interest due to their outstanding physical and chemical properties. These properties have found application in different areas like heterogeneous catalysis, solid oxide fuel cells, thermoelectricity, gas sensors, and photocatalysis, among others [1][2][3][4][5][6][7][8][9][10][11]. About their magnetic and electrical properties, a lot of experimental and theoretical researches have been done; however, the interpretation of the results is still under debate [12].…”