Journal
OPTICAL MATERIALS
Volume 86, Issue -, Pages 56-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2018.09.034
Keywords
Dual-responsive; Lanthanide; Luminescence; Controllable
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Funding
- National Natural Science Foundation of China [21571074]
- 111 Project [B17019]
- Self Determined Research Fund of CCNU [CCNU15A02016]
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Thermo/pH dual-responsive luminescent composites consisting of lanthanide-polyoxometalates and Poly (Nisopropylacrylamide)/Chitosan were synthesized. The dual-responsive nanoparticles are characterized by the FT-IR, UV-vis, TEM, SEM, TGA, DLS and luminescence. The prepared composites exhibit the thermo/pH-responsive properties and the controllable and switchable luminescence in solution in response to the simple changes in temperature and pH values. For instance, the composite hydrogels exhibit intense red luminescence under UV irradiation below 34 degrees C, and the luminescence become much weaker in solution above 34 degrees C. Moreover, the hydrogel could not show red luminescence in the buffer solution with low pH value. However, it shows bright red luminescence in neutral and alkaline buffer solution. The possible reasons for controllable luminescence are discussed in the research. The results suggest that the multifunctional nanoparticles could be potentially used in biomedical fields such as luminescent switches, biological labeling and imaging.
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