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      Acetone gas sensor based on NiO/ZnO hollow spheres: Fast response and recovery, and low (ppb) detection limit

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          Abstract

          NiO/ZnO composites were synthesized by decorating numerous NiO nanoparticles on the surfaces of well dispersed ZnO hollow spheres using a facile solvothermal method. Various kinds of characterization methods were utilized to investigate the structures and morphologies of the hybrid materials. The results revealed that the NiO nanoparticles with a size of ∼10nm were successfully distributed on the surfaces of ZnO hollow spheres in a discrete manner. As expected, the NiO/ZnO composites demonstrated dramatic improvements in sensing performances compared with pure ZnO hollow spheres. For example, the response of NiO/ZnO composites to 100ppm acetone was ∼29.8, which was nearly 4.6 times higher than that of primary ZnO at 275°C, and the response/recovery time were 1/20s, respectively. Meanwhile, the detection limit could extend down to ppb level. The likely reason for the improved gas sensing properties was also proposed.

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          Author and article information

          Journal
          Journal of Colloid and Interface Science
          Journal of Colloid and Interface Science
          Elsevier BV
          00219797
          June 2017
          June 2017
          : 495
          : 207-215
          Article
          10.1016/j.jcis.2017.01.106
          28237094
          d20c955f-3336-4ece-9eae-95e9d896e4bd
          © 2017

          https://www.elsevier.com/tdm/userlicense/1.0/

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