Silicon Dioxide SiO2 Nanoparticles (SiO2, 99%, 8nm, …
The products were characterized by FTIR, TEM and photoluminescence spectroscopy. Transmission Electron Microscopy (Phillips CM-120, operating at 80 kV) was used to analyze the size distribution of the prepared product. TEM samples were prepared by dipping holey-carbon-coated, 400-mesh electron microscope grids into the hexane colloid solution and drying them at 120 °C overnight. Energy dispersive X-ray spectroscopy (EDS) was performed on JOEL 2500SE with an accelerating voltage of 200 kV. The corresponding histogram of silicon nanoparticles size based on a survey of 870 particles from different regions of the grid. UV-vis and PL spectra of silicon colloid solution were obtained on a Cary 100 Bio spectrometer (Varian) and FluoroMax-3P fluorometer, respectively. 1H NMR (300 MHz) spectra were recorded on a Varian Mercury 300 instrument on the dispersions of the octyl capped Si particles, polymer, and polymer-coated octyl capped Si nanoparticles in deuterated chloroform (see ). The FT-IR spectra were collected on a Shimadzu IR Prestige 21 spectrophotometer by dropping the hexane colloid on a KBr plate and allowing the solvent to evaporate. Photoluminescence quantum yield was obtained by comparison of the PL intensity of a nanoparticle sample with that of the solution of quinine sulfate (laser grade) in 0.1M H2SO4 solution. Literature value of 0.54 was taken for the room-temperature PL efficiency of quinine sulfate in 0.1M H2SO4 solution . Isolated samples were dissolved in chloroform or water and measured in a standard 1-cm quartz cell with controlled optical densities below 0.10 at the excitation wavelength.
Binary compound nanoparticles - Silicon oxide nanoparticles
Binary compound nanoparticles - Silicon oxide ..
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Functionalised silicon oxide nanoparticles for …
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