SYNTHESIS AND PHOTODYNAMIC PROPERTIES OF COLLOIDAL SILVER SOLUTIONS
Journal Title: Вісник Національного університету "Львівська політехніка", серія "Радіоелектроніка та телекомунікації" - Year 2017, Vol 885, Issue 2017
Abstract
This work presents the results of research the electromagnetic radiation influence on the change in the geometric shape of spherical silver nanoparticles, obtained by method of photostimulated recovery of Ag ions from salt solution (AgNO3). Сrystalline sodium citrate (Na3C6H5O7) was used to recover Ag by anions of citrate acid. Due to adsorption on the surface of silver nanoparticles and creating electrostatic barrier that prevents aggregation of silver nanoparticles, sodium citrate was also used as a stabilizer. Using light for the controlled synthesis and shape changing of silver nanoparticles are very perspective. Light can significantly affect on the formation and growth of nanoparticles. This work show, that using of photon fluxes is an effective way to modifying the spatial shape of nanoparticles, since nanoobjects have the ability to absorb a certain wavelength. This allows shifting the working range of wavelengths to the longer-wavelength region of the spectrum. The research of the light influence on silver nanoparticles was carried out by irradiating silver colloids by LED-diodes with power 1W and wavelengths 525 nm, 465 nm and 623 nm during 6 days under similar conditions. It is shown that an additional absorption peak has appeared on the absorption spectra for all samples, irradiating by different wavelengths. This is linked to a partial change in the geometrical shape of the nanoparticles. The theoretical prediction of the size of silver nanoparticles and the plasmon resonance peak position on the spectral scale were carried out by principle of the dipole equivalence. The comparison of the calculated dependences of the absorption coefficient of synthesized silver nanoparticles from the wavelength with the experimental ones was carried out.
Authors and Affiliations
T. Bulavinets, Iryna Yaremchuk, Ya. V. Bobitski
Keywords
Related Articles
- EP ID EP456385
- DOI -
- Views 112
- Downloads 0
SOLVING OF RADIOELECTRONIC SYSTEMS COMBINATORIAL OPTIMIZATION PROBLEMS WITH MS EXCEL SOLVER
Possibilities of modelling optimization design problems as the extreme combinatorial graph problems and solving them in MS Excel Solver are studied. Drawbacks of existing models from considering their realization in MS E...
THE DISPERSION EQUATION FOR MODE SPECTRA EVALUATION IN OPENED LAYERED CYLINDRICAL DIELECTRIC WAVEGUIDES
This paper is devoted to the solving an eigenvalue problem for opened layered cylindrical waveguide structure with arbitrary finite number coaxial magnetodielectric layers. Classical method of separation of variables for...
DATA PROTECTION WITH INTELLECTUAL SUPPORT OF ORGANIZATIONAL AND TECHNICAL AND OPERATIONAL MANAGEMENT
For the successful use of modern information technologies, it is necessary to effectively manage not only the network, but also information systems security (ISS), the information system on the level of the system must o...
RESEARCH ON QUALITY OF SERVICE PARAMETERS FOR PHOTONIC TRANSPORT NETWORKS
Designing the photonic transport networks is the task of great complexity, because of variety traffic queues should be transmitted with different priorities. Task of dynamic supporting the different quality of service (Q...
QUADRATURE DETECTOR SYMBOLIC MODEL
Quadrature detectors (QD) are widely used in a radioelectronic devices as alternative to the synchronous detectors. There are many applications where there is necessary to measure the amplitude of input signal with speci...