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Influence of Silver Colloid on Fluorescein Spectral Properties

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Frąckowiak D., Balter A., Karolczak J., Siejak P.
Acta Physica Polonica A
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2006
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vol. 110
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issue 4
451-458
EN
In order to check if the observed earlier changes in fluorescence intensities of fluorescein solution due to the addition of colloidal suspension of silver are related to the generation of surface plasmon coupled emission, the steady state photothermal spectra and fluorescence decay times of such samples were measured. The Gaussian components of photoacoustic spectra for solutions with and without silver colloid addition were determined and compared with components of absorption and fluorescence excitation spectra of the same samples. The efficiencies of thermal and radiative deactivation of various samples were discussed. The fluorescence decay times measured at the wavelength of excitation not exhibiting the increase in photonic mode density depend only on the dye concentration. Decays exhibit changes as a result of silver addition with excitation in the region in which enhancement of fluorescence is observed. These changes are due not only to the change in the fluorescence yield generated by interactions with plasmons but also to those in thermal deactivation of the sample related to the colloid presence.
2
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Photoelectrochemical Cell with Dye Molecules Oriented in Nematic Liquid Crystal

100%
Naser N. S., Planner A., Frąckowiak D.
Acta Physica Polonica A
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1997
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vol. 92
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issue 3
535-542
EN
A photoelectrochemical cell consisting of two semiconducting electrodes covered by orienting SiO_{x} layers and filled with merocyanine solutions in nematic liquid crystal was constructed. Dye molecules were oriented as a result of the guest-host effect. Generation of photocurrent by two components of polarized light gives different values of photocurrent amplitude but anisotropy of photocurrent is lower than that of absorption in the region of a free base form of dye. It is explained by dominant participation of a protonated form of dye in the photocurrent generation. The last form exhibits a lower degree of orientation than the free base form of dye.
3
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Excitation energy transfer between chlorophyll a and chlorophyll b obtained from fluorescence meaeurment's

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Szurkowski J., Hotchandanl S., Leblanc R. M., Frąckowiak D., J.Szurkowski - Poznań Technical University I. o. P., D. Frąckowiak - Poznań Technical University I. o. P., S. Hotchandanl - Centre de Recherche en Photobiophysique Université du Qubec à Trois Rivierés Québec C., R.M. Leblanc - Centre de Recherche en Photobiophysique Université du Qubec à Trois Rivierés Québec C.
Acta Universitatis Lodziensis. Folia Biochimica et Biophysica
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1986
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vol. 5
4
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Photoacoustic spectra of oriented systems

100%
Frąckowiak D., Hotchendani S., Leblanc R. M., D. Frąckowiak - Poznań Technical University I. o. P., S.Hotchendani - Centre de Recherche en Photobiophysique Université du Qubec à Trois Rivierés Québec C., R.M. Leblanc - Centre de Recherche en Photobiophysique Université du Qubec à Trois Rivierés Québec C.
Acta Universitatis Lodziensis. Folia Biochimica et Biophysica
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1986
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vol. 5
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