A novel organic pollutants gas sensing material p-type CuAlO2 microsphere constituted of nanoparticles for environmental remediation

Sensors and Actuators B: Chemical, Volume 223, Pages 138 - 148, 2016, issn 0925-4005

1 de fevereiro de 2016 CDMF Artigo, Meio Ambiente 0

Schematic-diagrams-of-oxidation-and-reducing — Schematic diagrams for oxidation(O3 and NO2) and reducing (COandNH3) type gas sensing operating mechanismonp-type CuAlO2 microspheres constitutedofnanoparticles.

Writers: S. Thirumalairajan and Valmor R. Mastelaro

Keywords: CuAlO2; Hydrothermal; Self assembly; Microspheres; Toxic gas; XAS

Abstract: Abstract In this paper, novel organic pollutants gas sensing material CuAlO2 microspheres constituted of nanoparticles were successfully prepared by wet chemical route and characterized by structural (XRD, XAS), morphological (SEM, TEM, HRTEM) and thermal (TG) analysis. In addition, the oxidation (O3 and NO2) and reduction (NH3 and CO) toxic gas sensing properties of the prepared CuAlO2 microspheres were systematically investigated. CuAlO2 microspheres exhibited real-time response for very low detection level of 200 ppb at 200 Â°C, with fast response (29 s), recovery (45 s) time, good reproducibility and stability to ozone gas indicating their promising application in toxic gas sensor which is better than other oxidation and reduction gases. Also comparative studies of charge-transport properties mainly ascribed to the increased proportion of ozone gas exposed surface active layers are discussed in gas sensing mechanism.

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O CDMF é um dos Centros de Pesquisa, Inovação e Difusão (CEPID) apoiados pela FAPESP. O Centro também recebe investimento do CNPq, a partir do Instituto Nacional de Ciência e Tecnologia dos Materiais em Nanotecnologia (INCTMN).