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Unique porous ZnO polygonal nanoflakes were synthesized by the microwave hydrothermal method. The structural properties of the products were investigated by using X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), and high-resolution TEM techniques. In situ diffuse reflectance infrared Fourier transform spectroscopy technique was employed to investigate the mechanism of NO 2 sensing. Free nitrate ions, nitrate ions, and nitrite anions were the main adsorbed species. N 2 O was formed via NO – and N 2 O 2 – that were stemmed from NO. Comparative tests for gas sensing between gas sensors based on the as-prepared porous ZnO nanoflakes and purchased ZnO nanoparticles clearly showed that the former exhibited more excellent NO 2 sensing performances. Photoluminescence and X-ray photoelectron spectroscopy spectra further proved that the intensities of donors (oxygen vacancy (V O ) and/or zinc interstitial (Zn i )) and surface oxygen species (O 2 – and O 2 ), which were involved in the mechanism of gas sensing led to the different gas-sensing properties.
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Chen et al. (2011) studied this question.
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