Journal
OPTICAL MATERIALS
Volume 34, Issue 5, Pages 761-768Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2011.11.003
Keywords
Core-shell nanoparticles; Rh6G; Silica; Photoluminescence; Photostability; Spectral properties
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Funding
- King Abdul Aziz City for Science and Technology (KACST) [AT-18-43]
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Rhodamine (Rh6G) dye-silica core-shell nanoparticles (DSCSNPs) have been prepared by the controlled hydrolysis and condensation of single silica precursor tetraethylorthosilicate (TEOS) using the sol-gel method. Scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis reveal that dye molecules are entrapped in silica (SiO2) shell resulting into core-shell particles of similar to 30 nm diameter. These particles are also characterized by X-ray diffraction and Fourier transforms infrared spectroscopy. The results indicate that core-shell particles are all in spherical shape and have a narrow size distribution. The fluorescent and optical properties of core-shell particles have been investigated using fluorescence and UV-Visible absorption spectra. The photoluminescence in solid or liquid medium occurs at the same wavelength. The SiO2 shell restricts the leakage and photobleaching of dye efficiently. These core-shell nanoparticles are found to be highly luminescent and stable. (C) 2011 Elsevier B.V. All rights reserved.
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