OPTICAL PROPERTIES OF SILVER AND GOLD CLUSTERS IN SILICA MATRICES

1 GLADSKIKH Igor
Co-authors:
1 GLADSKIKH Polina 1 VARTANYAN Tigran
Institution:
1 ITMO University, Saint-Petersburg, Russia, 138020@mail.ru
Conference:
9th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 18th - 20th 2017
Proceedings:
Proceedings 9th International Conference on Nanomaterials - Research & Application
Pages:
821-825
ISBN:
978-80-87294-81-9
ISSN:
2694-930X
Published:
8th March 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
15 views / 10 downloads
Abstract

Absorption and luminescence properties of silver and gold nanoclusters embedded in silica matrixes were studied experimentally. Thin SiO2 films with different amount of silver and gold were produced by co-deposition of metal and SiO2 onto the silica substrates in vacuum. Films with silver content possess three peaks in absorption spectra in near the UV range and two peaks in luminescence spectra in the visible range. We ascribed these spectral features to silver nanoclusters of different sizes that present in the film. Films containing gold particles have continuous absorption spectra in the visible and UV ranges. The luminescence was observed only in the samples with the silver content of less than 2.2%. Quenching of the luminescence in the films with larger silver content we associate with the nonradiative energy transfer between close-packed particles. Thermal annealing leads to the formation of lager particles and transforms both absorption and emission spectra of the films.

Keywords: cluster, silver, gold, thin film, dielectric matrix
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