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Non-leachable highly luminescent ordered mesoporous SiO2 spherical particles
L A Rocha1, J M A Caiut, Y Messaddeq
1Institute of Chemistry, UNESP, Univ Estadual Paulista, CP 355, Araraquara-SP, 14801-970, Brazil.
Nanotechnology
|March 25, 2010
Summary
Highly luminescent mesoporous silica particles were created using spray pyrolysis. A silica shell prevented the leaching of encapsulated Rhodamine B dye, ensuring stable luminescence.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Ordered mesoporous silica materials offer unique properties for various applications.
- Controlling dye encapsulation and preventing leaching are critical for luminescent nanomaterials.
Purpose of the Study:
- To synthesize highly luminescent mesoporous silica (SiO2) particles.
- To encapsulate Rhodamine B (RhB) dye within these particles and prevent its leaching.
- To characterize the structural and luminescent properties of the synthesized materials.
Main Methods:
- Spray pyrolysis using tetraethylorthosilicate (TEOS) with structure-directing agents (cetyltrimethylammonium bromide or Pluronic F-68).
- Wet impregnation of Rhodamine B followed by a secondary silica shell coating.
- Characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), UV-Vis spectroscopy, and photoluminescence (PL).
Main Results:
- Synthesis of ordered mesoporous SiO2 particles with a hexagonal array of mesochannels.
- Successful monomeric encapsulation of Rhodamine B within the silica mesochannels.
- Demonstration that a secondary silica coating effectively prevents dye leaching.
Conclusions:
- Spray pyrolysis is an effective method for producing luminescent mesoporous silica particles.
- The developed method ensures stable dye encapsulation, crucial for applications requiring long-term luminescence.
- These materials show potential for use in sensing, imaging, and other photonic applications.
