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One-pot synthesis of hierarchical WO₃ hollow nanospheres and their gas sensing properties
- Wang, Chong, Feng, Changhao, Wang, Meng, Li, Xin, Cheng, Pengfei, Zhang, Hong, Sun, Yanfeng, Sun, Peng, Lu, Geyu
- RSC advances 2015 v.5 no.38 pp. 29698-29703
- X-ray diffraction, detection limit, nanocrystals, nanospheres, nitrogen dioxide, synthesis, temperature, transmission electron microscopy, tungsten oxide
- In this paper, a one-pot synthesis of WO₃ hollow sphere nanostructure has been realized via a one-pot template-free solvothermal method. X-Ray diffraction patterns demonstrated that the products are pure monoclinic WO₃. Based on the observation of scanning electronic microscopy (SEM) and transmission electron microscopy (TEM), it was revealed that the as-prepared WO₃ nanospheres have a diameter of around 2 μm and are hollow structures with shell thickness of about 300 nm which are constructed by numerous oriented nanocrystals. Sensors based on the synthesized WO₃ hollow nanospheres exhibited high selectivity to NO₂ at low operating temperature. The detection limit can be as low as ∼40 ppb level.