| Is Part of |
Open readings 2023: 66th international conference for students of physics and natural sciences, April 18-21, 2023, Vilnius, Lithuania: annual abstract book / editors: M. Keršys, Š. Mickus.. Vilnius : Vilnius University press, 2023. p. 220.. ISBN 9786090708835 |
| Abstract [eng] |
Nanoparticles are gaining attention due to their wide range of applications such as drug delivery, wound dressing, bio-sensing, household appliances, electronics, water purification, cosmetics, catalysis, etc. Noble metal nanoparticles, especially Ag and Au, have been investigated as the most efficient materials in visible range for sensing, especially for Surface Enhanced Raman Scattering sensors. One of the issues in this application is the particle stability as for assembly of SERS substrate one need only small amount of nanoparticles, whereas the volume of solution varies from few millilitres up to hundreds of millilitres. In such conditions, it is very important to know the shelf life or stability of the colloids as it predetermines the experiment duration. The term “nanoparticle stability” is widely used to describe the preservation of a nanostructure property ranging from aggregation, composition, crystallinity, shape, size, and surface morphology [1]. In the present study, we have analysed the shelf life of the silver nanoparticles that were synthesised using seed mediated growth approach in aqueous medium by reduction of silver nitrate with trisodium citrate and tannic acid [2]. The keeping conditions were selected as the conventional in the laboratory environment: daylight at room temperature; kept in dark at room/+4°C temperature. The stability of colloids was tested for concentrated after the synthesis and diluted to a 1:3 ratio with distilled water. Such dilution level was selected, as it was the optimal ratio for UV-VIS measurements. The absorption spectra were measured of each sample every 2 weeks using an UV-VIS spectrometer. [...]. |
