Raman system for monitoring dye doping to hybrid polymer network

M. Gnyba (Corresponding Author), Mikko Keränen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Being a relatively low-temperature technique, the sol-gel technology enables the synthesis of hybrid polymers doped by organic dyes. In order to ensure the required properties of the final product, however, the mixing of sol and dye must be strictly controlled to avoid unwanted chemical reactions between them. Raman spectroscopic in-sit monitoring of the process was used to address this problem. Problems encountered in spectroscopic studies of non-transparent dye-doped sols, arising from intensive scattering, attenuation of the Raman signal inside the investigated material, and fluorescence induced by the laser beam, are discussed. The Raman measuring system constructed for the research presented in this paper uses a diode laser and a compact spectrometer connected to a reaction glass vessel by a fibre optic probe. Proper selection of the excitation beam wavelength and suitable design of the opto-mechanical setup results in an increase of the Raman signal and improved rejection of interfering signals. The system presented does not require access inside the vessel. In-situ monitoring was carried out for the process conducted at room temperature and up to 87 °C. As the intensity of the Raman bands assigned to the dye did not change during the process, it can be concluded that dye does not decompose.
Original languageEnglish
Pages (from-to)41 - 48
Number of pages8
JournalMaterials Science-Poland
Volume23
Issue number1
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

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Polymers
Coloring Agents
Dyes
dyes
Doping (additives)
Monitoring
polymers
Polymethyl Methacrylate
Sols
vessels
rejection
Fiber optics
Sol-gels
Semiconductor lasers
Spectrometers
Chemical reactions
fiber optics
chemical reactions
attenuation
Fluorescence

Cite this

Gnyba, M. ; Keränen, Mikko. / Raman system for monitoring dye doping to hybrid polymer network. In: Materials Science-Poland. 2005 ; Vol. 23, No. 1. pp. 41 - 48.
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Gnyba, M & Keränen, M 2005, 'Raman system for monitoring dye doping to hybrid polymer network', Materials Science-Poland, vol. 23, no. 1, pp. 41 - 48.

Raman system for monitoring dye doping to hybrid polymer network. / Gnyba, M. (Corresponding Author); Keränen, Mikko.

In: Materials Science-Poland, Vol. 23, No. 1, 2005, p. 41 - 48.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Raman system for monitoring dye doping to hybrid polymer network

AU - Gnyba, M.

AU - Keränen, Mikko

PY - 2005

Y1 - 2005

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AB - Being a relatively low-temperature technique, the sol-gel technology enables the synthesis of hybrid polymers doped by organic dyes. In order to ensure the required properties of the final product, however, the mixing of sol and dye must be strictly controlled to avoid unwanted chemical reactions between them. Raman spectroscopic in-sit monitoring of the process was used to address this problem. Problems encountered in spectroscopic studies of non-transparent dye-doped sols, arising from intensive scattering, attenuation of the Raman signal inside the investigated material, and fluorescence induced by the laser beam, are discussed. The Raman measuring system constructed for the research presented in this paper uses a diode laser and a compact spectrometer connected to a reaction glass vessel by a fibre optic probe. Proper selection of the excitation beam wavelength and suitable design of the opto-mechanical setup results in an increase of the Raman signal and improved rejection of interfering signals. The system presented does not require access inside the vessel. In-situ monitoring was carried out for the process conducted at room temperature and up to 87 °C. As the intensity of the Raman bands assigned to the dye did not change during the process, it can be concluded that dye does not decompose.

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