Fluorescent Glycine-Coated Silver Nanoparticles as Bio-Imaging Agents for the Neural Stem Cells

We study experimentally the photoluminescence of small glycine-coated silver nanoparticles and their application as the bio-imaging markers of the neural stem cells. In addition we study nanoparticle’s toxic effects on the neural stem cells. Glycine-coated silver nanoparticles were synthesized using a thermal reduction of silver nitrate in a glycine matrix and size-separated via centrifugation. The properties of the nanoparticles were characterized using transmission electron microscopy, extinction and photoluminescence spectroscopy. Our results indicate that the nanoparticles have deleterious effects on the cells and showed an amplified increase in their death rates. In fixed cells the particles penetrate the membranes within an hour and 25 minutes of incubation, but do not penetrate into the body of the cell

Light Scattering by Silver Nanoparticles in Colloid Solutions for Improved Photovoltaic Devices

Incorporation of metal nanoparticles (NPs) into photovoltaic cells attracts much attention last years as a promising way for efficiency improvement by light trapping. Precise characterization of light scattering properties of NPs is essential for their successful application. Scattering diagrams and spectra of absorbed light are studied with custom-assembled automated experimental setups. It was found, that 60-240 nm in diameter Ag NPs demonstrate efficient wide-angle light scattering due to excitation of multipole resonances, which manifest themselves as side lobes in the scattering diagrams. Contributions of the multipole modes were also resolved in the absorption spectra of NPs. Direction of light scattering and a red shift of light scattering efficiency maxima, comparing to absorption maxima, studied aiming its application for efficient trapping of long-wavelength radiation in photovoltaic cells

Fluorescent Glycine-Coated Silver Nanoparticles as Bio-Imaging Agents for the Neural Stem Cells

We study experimentally the photoluminescence of small glycine-coated silver nanoparticles and their application as the bio-imaging markers of the neural stem cells. In addition we study nanoparticle’s toxic effects on the neural stem cells. Glycine-coated silver nanoparticles were synthesized using a thermal reduction of silver nitrate in a glycine matrix and size-separated via centrifugation. The properties of the nanoparticles were characterized using transmission electron microscopy, extinction and photoluminescence spectroscopy. Our results indicate that the nanoparticles have deleterious effects on the cells and showed an amplified increase in their death rates. In fixed cells the particles penetrate the membranes within an hour and 25 minutes of incubation, but do not penetrate into the body of the cell