Fabrication of thermo-sensitive optical switches based on lanthanide-polyoxometalates and their "on-off" luminescence controlled by temperature

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• 作者：Jun Wang ; Weiqian Zhao ; Menglan Zhao ; Si Chen ; Wuke Li
• 关键词：Thermo ; sensitive ; Luminescence ; Lanthanide ; Switchable
• 刊名：Journal of Polymer Research
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：23
• 期：4
• 全文大小：884 KB
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• 作者单位：Jun Wang (1)
  Weiqian Zhao (1)
  Menglan Zhao (1)
  Si Chen (1)
  Wuke Li (1)
  
  1. College of Chemistry, Central China Normal University, Wuhan, 430079, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1572-8935

文摘

The temperature-responsive luminescent nanocomposites were prepared by the combination of poly (N-isopropylacrylamide) (PNIPAM) with lanthanide-polyoxometalates/SiO₂ spheres, exhibiting controlled reversible luminescent behavior with change in temperature. The structures and properties of nanocomposites were characterized by transmission electron microscopy, scanning electron microscope, FT-IR, UV-vis, dynamic light scattering and luminescence spectra. The research shows that the nanocomposites in aqueous solution display “on–off” luminescence by simple temperature stimuli. For example, the hybrid nanocomposites of PNIPAM/Eu-polyoxometalate/SiO₂ in aqueous solution show bright red luminescence under UV light, which could be observed by the naked eye when the temperature is below the lower critical solution temperature (LCST), showing the “on” state. However, the red luminescence of nanocomposites in aqueous solution is significantly decreased when temperature is above LCST, showing the “off” state.