Structural and spectral investigations of Rhodamine (Rh6G) dye-silica core-shell nanoparticles |
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Authors: | A.S. Al Dwayyan Saif M.H. QaidM.A. Majeed Khan M.S. Al Salhi |
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Affiliation: | a Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 114 51, Saudi Arabia b King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2454, Riyadh 114 51, Saudi Arabia |
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Abstract: | 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 ∼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. |
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Keywords: | Core-shell nanoparticles Rh6G Silica Photoluminescence Photostability Spectral properties |
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