| Abstract [eng] |
The ability to create silver nanoparticles with precise control of their physical, chemical and structural properties is crucial for expanding their applicability in various applications, e.g. optoelectronics, energy storage, catalysis, chemical and biological sensors, biomedicine and others. Because of its properties, silver can be used in surface enhanced Raman scattering (SERS) sensors, which allow the detection of vanishingly small amounts of various materials and, in some cases, single molecules. The aim of this work was to synthesize spherical silver nanoparticles employing seeded growth method. Silver nitrate (AgNO3), tannic acid (C76H52O46) and trisodium citrate (Na3C6H5O7) were used as precursor, reducer and stabilizer respectively. The results of UV-Vis absorption spectra were recorded on an AvaSpec-2048 fiber optic spectrometer. The size and shape of silver nanoparticles were determined by microscopic analysis using scanning electron microscope QUANTA 200FEG. The SEM images were analyzed with ImageJ software and size distribution of particles was determined measuring over 50 particles in each image. The absorption spectrum of silver nanoparticles was theoretically calculated using the MiePlot software. The position of absorbance peaks of the synthesized colloidal solutions varied between 430 nm and 543 nm. The investigated silver nanoparticles are monodisperse with a diameter ranging from 11 nm to 74 nm (standard deviation is only 2.9 - 6.9 nm). |
