Synthesis of Mixed-Phase TiO₂ Nanopowders Using Atmospheric Pressure Plasma Jet Driven by Dual-Frequency Power Sources

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• 作者：Yong Wang ; Qianghua Yuan ; Guiqin Yin ; Yu Zhang…
• 关键词：Atmospheric pressure dual ; frequency (DF) plasma jet ; Mixed ; phase TiO2 nanopowders ; Photocatalytic activity ; Discharge RF power
• 刊名：Plasma Chemistry and Plasma Processing
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：36
• 期：6
• 页码：1471-1484
• 全文大小：1,373 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics
  Characterization and Evaluation Materials
  Mechanical Engineering
  Inorganic Chemistry
  Nuclear Physics, Heavy Ions and Hadrons
  
• 出版者：Springer Netherlands
• ISSN：1572-8986
• 卷排序：36

文摘

Mixed-phase TiO₂ nanopowders with different ratios of anatase and rutile have been successfully synthesized using atmospheric pressure plasma jet driven by dual-frequency power sources. The crystal structures of the TiO₂ nanopowders were characterized by X-ray diffraction, SAED, HRTEM, and Raman shift spectroscopy. These results indicated that samples possessed anatase and rutile structure, in addition, the crystallinity of the TiO₂ nanopowders increased and the chlorine contamination decreased with discharge RF power increasing. The photocatalytic activity of the TiO₂ nanopowders was evaluated by decomposition methylene blue solution. The TiO₂ nanopowders which were produced at the discharge RF power of 110 W had the highest photocatalytic activity. Optical emission spectroscopy (OES) was used to detect various excited species in the plasma jet. The results indicate that the various RF power significantly changes the intensities of emission lines (Ar, Ar+, Ti, Ti+, Ti2+, Ti3+ and O), which results in the TiO₂ nanopowders a mixture of anatase and rutile phases. The nonequilibrium chemical composition could be formed in one step without anneal. It may have potential applications for synthesizing nanosized particles of high crystallinity by reactive nonthermal plasma processing.