A new CO2 detection system based on the trirutile-type CoSb2O6 oxide

• Published in: Journal of materials science. Materials in electronics 2018-09, Vol.29 (18), p.15741-15753
• Main Authors: Guillén Bonilla, Alex, Rodríguez Betancourtt, Verónica M., Guillén Bonilla, Héctor, Gildo Ortiz, Lorenzo, Blanco Alonso, Oscar, Franco Rodríguez, Nancy Elizabeth, Reyes Gómez, Juan, Casillas Zamora, Antonio, Guillen Bonilla, José Trinidad
• Format: Article
• Language: English
• Subjects: Antimony; Carbon dioxide; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystal structure; Crystallinity; Emission analysis; Ethanol; Ethylenediamine; Field emission microscopy; Gas detectors; Gas sensors; Gases; Materials Science; Microwaves; Nitrates; Optical and Electronic Materials; Phase transitions; Radiation; Reagents; Scanning electron microscopy; Sprinkler systems; Stainless steel; Thick films; X-ray diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-018-9228-4

CoSb 2 O 6 powders were synthesized by means of the colloidal method, using cobalt nitrate, antimony chloride, ethylenediamine, and ethyl alcohol as reagents. The crystalline phase of the oxide was obtained at 600 °C and analyzed by X-ray diffraction. The CoSb 2 O 6 showed a tetragonal crystalline structure with cell parameters a = 4.6495 Å, c = 9.2763 Å, and a P4 2 /mnm spatial group. The powders were analyzed by means of field emission scanning electron microscopy, finding microcubes (3D) with sizes of 10–25 µm, and microrods with lengths and diameters of 13–27 and 4.5–13.5 µm, respectively. Thick films prepared with oxide’s powders were exposed to air-CO 2 (100‒100 ppm) atmospheres at 250 °C. Material’s response increased as the CO 2 was injected into the measuring chamber, recording a phase change and an average impedance magnitude (Δ|Z|) of ~ 2.623 kΩ. Low CO 2 concentrations were detected at relatively low temperatures, which turns the CoSb 2 O 6 into a potential gas sensor. Taking advantage of this, an electronic device was successfully developed to detect concentrations of CO 2 .