Search academic texts

Registration Number

0217U006563, 0115U003676 , R & D reports

Title

The study of quantum - dimensional and nonlinear - optical properties of complex nanoparticles and arrays such as "quantum solid" based on A2B6 semiconductors and noble metals as the material media nanophysics and nanoelectronics.

popup.stage_title

Head

Brodyn M.S.,

Registration Date

26-09-2017

Organization

Institute of physics NASU

popup.description2

At the second stage of the project, nanostructured materials with a given morphology and physical and chemical properties, in particular gold nanoparticles (Au) with a determind concentration and shape (nano-stars and nanoclustes) were synthesized. The study of optical absorption spectra of one and multilayered structures from gold nanosized objects placed on glass substrates was conducted. The changes in the spectral position and the shape of the plasmonic bands depending on the number of monolayers in the investigated structures are detected. By using nanosecond laser radiation (? = 532 nm), measurements of optical cubic nonlinearity on nanosize films of gold at different densities of nanoparticles in these films were performed. The values of the coefficient of cubic nonlinear susceptibility are quite high: Re? (3) = 3 ? 10-6 esu and Im? (3) = 9.35 ? 10-5 esu. We must say that on island films of gold, synthesized by the annealing of a continuous spray film, we previously obtained higher values of Re? (3) at ? = 532 nm (Re? (3) = 8 ? 10-5 esu), but the linear absorption and scattering in the case of nanostars is three times lower than in the case of nanoislands films. Improvement of the technology of obtaining porous film structures on the basis of dielectric spheres with quantum dot A2B6 semiconductors deposited on their surface. Investigations of exciton processes in such mesoporous structures with quantum dots of CdS allowed us to explane the nature of the phase (percolation) transition of excitons and to find the corresponding critical concentrations of nanoparticles. The obtained results can be useful in explaining physical processes in photovoltaic systems of the 3rd generation, where the separation of electrons and holes occurs when absorbed by sunlight.

Product Description

popup.authors

Безкровний Олексій Сергійович
Бондар Микола Володимирович
Бродин Михайло Семенович
Ляховецький Володимир Романович
Матвєєвська Неоніла Анатолієвна
Матейченко Павло Вікторович
Руденко Валентин Іванович
Стьопкін Віктор Іванович

popup.nrat_date

2020-04-02