Structural investigations of photosensitive composites «Au Nps/Selenium film»
The Raman spectra of amorphous selenium films with a thickness d = 30–750 nm prepared by the thermal evaporation of glassy Se on glass substrates and on the surface of arrays of randomly distributed gold nanoparticles with average NPs size 40–60 nm and maximum of surface plasmon resonance band 574 n...
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| Date: | 2020 |
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| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | Ukrainian |
| Published: |
Інститут проблем реєстрації інформації НАН України
2020
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| Subjects: | |
| Online Access: | http://drsp.ipri.kiev.ua/article/view/225889 |
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| Journal Title: | Data Recording, Storage & Processing |
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Data Recording, Storage & Processing| Summary: | The Raman spectra of amorphous selenium films with a thickness d = 30–750 nm prepared by the thermal evaporation of glassy Se on glass substrates and on the surface of arrays of randomly distributed gold nanoparticles with average NPs size 40–60 nm and maximum of surface plasmon resonance band 574 nm have been investigated. Investigations of Raman spectra of amorphous Se films and composite structures «Au NPs/Se film» were carried out at room temperature on the Horiba Jobion Yvon spectrometer. For excitation, a laser with λexc. = 457, 532 and 671 nm were used.
For nanosized (d < 100 nm) nominally pure Se films Raman signal is practically absent. The reliable Raman signal was obtained for Se films of the same thicknesses, but deposited on Au NPs arrays. This means that glass substrates with arrays of randomly distributed Au NPs formed on their surface can be used as effective SERS (surface-enhanced Raman scattering ) – substrates with a high efficiency of Raman signal amplification for the investigation of Raman spectra and, accordingly, the structure of nanosized chalcogenide films.
In the Raman spectra of nanosized Se films, bands and features are detected, which are manifested in the spectra of trigonal, monoclinic and vitreous selenium. It is established that the matrix of the amorphous selenium film is characterized by an irregular sequence of cis- and trans-configurations, i.e. one molecule can contain both elements of Sen chains and elements of Se8 rings. The structure of the phase that occurs in the matrix of the amorphous film during annealing and laser irradiation (at λexc.= 457 and 532 nm) corresponds to the structure of trigonal selenium. Fig.: 5. Refs: 19 titles. |
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