A novel organic pollutants gas sensing material p-type CuAlO_2 microsphere constituted of nanoparticles for environmental remediation

摘要

In this paper, novel organic pollutants gas sensing material CuAlO_2 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 (O_3 and NO_2) and reduction (NH_3 and CO) toxic gas sensing properties of the prepared CuAlO_2 microspheres were systematically investigated. CuAlO_2 microspheres exhibited real-time response for very low detection level of 200 ppb at 200 ℃, 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.