Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 157, Issue 2, Pages 565-574Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.05.023
Keywords
ZnO; Nanostructure; Gas sensing mechanism; DRIFTS; NO2
Funding
- China National Natural Science Funds [20875007, 20935002]
- Beijing Municipal Science and Technology Development project [Z080003032208012]
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Hierarchical flower-like and 1D tube-like ZnO architectures were synthesized by a microemulsion-based solvothermal method. Technologies of XRD, SEM and TEM were used to characterize the morphological and structural properties of the products. The influence of the flower-like and tube-like morphologies on their NO2 sensing properties was investigated. The experimental results showed that high-sensitivity NO2 gas sensors were fabricated. The sensitivity of the tube-like ZnO gas sensor was much higher than that of the flower-like ZnO gas sensor and the tube-like ZnO gas sensor exhibited shorter response time. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) technique was employed to investigate the NO2 sensing mechanisms. Free nitrate ions, nitrate and nitrite were the main adsorbed species during the adsorption, and NO also existed in the initial period of surface reoxidation. Furthermore, NO2 was formed via NO- and N2O2- stemmed from NO and increased upon rising temperature. Moreover, the PL spectra and the XPS spectra further proved that the intensity of donors (oxygen vacancy (V-O) and zinc interstitial (Zn-i)) and surface oxygen species (O-2(-) and O-2) involved in the gas sensing mechanism leaded to the different sensitivities. (C) 2011 Elsevier B.V. All rights reserved.
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