Porous spheres-like ZnO nanostructure as sensitive gas sensors for acetone detection
2013
Li, X.B. | Ma, S.Y. | Li, F.M. | Chen, Y. | Zhang, Q.Q. | Yang, X.H. | Wang, C.Y. | Zhu, J.
Porous spheres-like zinc oxide (ZnO) nanostructure was synthesized by electrospinning method followed by calcining. The microstructure and chemical composition were investigated with X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmet–Teller method and X-ray photoelectron spectroscopy. The results showed that the porous spheres-like ZnO nanostructure with large specific surface area (22.6m²/g) was composed of ZnO nanoparticles of ∼40–80nm grain size and numerous oxygen species (O⁻ and O²⁻) were adsorbed on the surface of ZnO nanoparticles. Meanwhile, the testing on gas sensing performance revealed that porous spheres-like ZnO nanostructure based sensor has an optimum operating temperature of 310°C, large resistance (1064kΩ), good stability for low concentration acetone (2ppm acetone at 310°C) and good selectivity at 310°C for acetone.
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